A welding magnet is a magnetic fixturing tool that holds ferrous metal at a fixed angle or alignment during tack-up and welding, working as a third hand so the joint does not move while the arc is live. For anyone building square tube frames, fitting 45-degree gussets or setting sheet metal butt joints, the magnet replaces the clamp-fight-grind cycle that eats a morning.
Yes, there are welding magnets with an on/off switch. Switchable designs route magnetic flux through the workpiece while the lever is on and short-circuit it internally when you flip the switch off, so the tool releases instantly and drops any chips and grinding dust instead of trapping them. Permanent-magnet designs never switch off, which is cheaper and simpler but means prying the tool loose and cleaning swarf out of the gap by hand every time.
This roundup covers the ten best welding magnets for fabrication we could put in front of real work: arrow magnets, magnetic squares, adjustable-angle positioners, a magnetic ground clamp and a hold-down for custom jigs. Every pick below is a ferrous-only tool, so nothing here will hold aluminum or 304 and 316 stainless. We weighted holding force, angle coverage, release behavior and how much real shop abuse each tool takes, and we last reviewed the list for 2026.
One note before you start reading: rated pull force is a marketing number measured face to face. At a 90-degree joint your usable hold is a fraction of that. We cover the derating rule in the buying guide, and it changes which magnet you should buy more than any other single spec.
If you are also outfitting the shop, our picks for the best sheet metal brakes for fabrication and best metal cutting chop saws for fabrication cover the two machines that sit next to the welding table.
Table of Contents
Top 3 Picks: The Best Welding Magnets for Fabrication
YESWELDER 4-Pc 50 lb Magnet Set
- 50 lb holding force per magnet
- 45/90/135 degree arrow design
- Four-piece set for multi-point holding
Strong Hand Mini Magnet MS346AK
- 25 lb pull force
- 30/60/45/90 degree fixed angles
- Compact metal body
Strong Hand MSA46-HD Adjust-O Square
- On/off magnetic switch
- 45 and 90 degree holding
- 65 lb rated pull force
Quick Comparison: Best Welding Magnets for Fabrication in 2026
| Product | Specifications | Action |
|---|---|---|
| YESWELDER 4-Pc Welding Magnet Set |
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| Strong Hand Mini Magnet MS346AK |
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Check Latest Price |
| Strong Hand MSA46-HD Adjust-O Magnet Square |
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 Strong Hand MLA600 Adjustable Angle Square |
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 Magswitch 300 Amp Switchable Ground Clamp |
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 FastCap MAGMICROSQUAR Micro Square |
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 Magswitch MagSquare 150 Switchable Square |
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 YESWELDER AJM-M Adjustable Angle Magnet |
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Check Latest Price |
 ARCCAPTAIN 25 lb and 55 lb Four-Piece Set |
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Check Latest Price |
 Magswitch MagJig 150 Switchable Hold-Down |
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Check Latest Price |
Six Types of Welding Magnets Explained
Shopping for a welding magnet means choosing a geometry, and there are six worth knowing. The type matters more than the brand because the wrong geometry simply cannot do the joint you weld every week.
Fixed-angle arrow magnet
An arrow magnet carries two or three machined faces meeting at 45, 90 and 135 degrees. It is a simple way to square tube and set gussets, and it comes in packs of four so you can hold multiple points at once.
Switchable magnetic square
A magnetic square wraps one or more faces around the workpiece and adds a lever that kills the field on demand. It is the category where on/off design is standard and where you pay for clean release and no swarf collection.
Adjustable-angle magnet
This is a square with a pivot and a scale, covering a wide range such as 30 to 270 degrees or 20 to 200 degrees. It is the pick for non-standard geometry: tapered legs, tapered tube, odd mitered joints.
Multi-angle positioner
A positioner accepts interchangeable angle blocks, so one body covers several fixed angles and often a pivot. It is a good middle ground when you need 30 and 60 degree work as well as square corners.
Sheet-metal spacing magnet
Thin, low-profile spacing magnets sit between two sheets to hold a consistent gap or a step in a bend line. They are for butt-joint alignment and gap control, not for holding heavy material.
Magnetic ground clamp
A ground clamp makes the electrical connection to the workpiece. Magnetic versions replace the spring jaw with a switchable magnetic contact, which matters on pipe and plate where clamping a ground is a daily annoyance.
1. YESWELDER 4-Pc Welding Magnet Set – Best Overall for Fabrication
YESWELDER 4-Pc Welding Magnet Set, 50 lb Holding Power Welding Accessories
50 lbs holding force per magnet
45, 90 and 135 degree arrow design
Four-piece set, model KY1101-50lb
Pros
- Highest rated pick in this roundup at 4.7 stars
- Four magnets cover multiple hold points on one frame
- Compact enough to position by hand
- Works for welding soldering marking off and pipe fitting
Cons
- Angle markings are often not a true 90 degrees
- Real pull falls short of the 50 lb label on thicker material
- Holds only in certain orientations rather than any angle
This is the set I put on the table first for anyone building frames out of square tubing. Four arrow-shaped magnets at 50 lbs of rated pull each, and the four-piece format is the reason it wins: one holds the vertical leg, one the horizontal, and the other two lock the far corners so you can walk around the frame before tacking.
Each magnet measures 4.76 inches long by 3.26 inches wide and 0.7 inches thick, which is small enough to get a hand on and reposition without a struggle. Reviewers report holding 1 inch and 2 inch tubing square with them, and that matches how I use them on lighter frames and gussets.
The honest weakness is angle accuracy. Buyers point out repeatedly that the markings are not always a true 90 degrees, so I check the corner with a machinist square after setting and correct it before tacking. If your tolerance is tight, spend the extra time rather than trusting the printed face.
Second weakness is real pull. On heavier pieces the actual hold sits below the 50 lb rating, and users working large workpieces find they need all four magnets together. Treat 50 lbs as a bench number, not a joint number, and derate it as the buying guide explains.
When this magnet is the right call
For a small shop or a first fabrication kit, four of these cover more jobs than one expensive tool. They handle 90-degree square tube frames, 45 and 135 degree gusset layouts, and light sheet work, and they tuck into a toolbox without adding weight.
They are also the sensible choice when you are doing the same frame repeatedly. Four identical magnets means when one wears or gets dropped you replace one piece rather than a whole single-tool setup.
When to buy something else
Do not lean on this set for 1/4 inch plate or thick structural. A 50 lb arrow magnet on a heavy butt joint will creep during tacking, and there is no lever to help you break it apart when you need to.
Also skip it if chip cleanup matters to you. There is no on/off switch here, so swarf and grinding dust stick in the seam and you pick them out by hand every single time.
2. Strong Hand Mini Magnet MS346AK – Best for Tight Corners
Strong Hand Welding Magnet – Mini Magnets MS346AK
25 lb max pull force
30, 60, 45 and 90 degree faces
Six-piece pack, model MS346AK
Pros
- Smallest body here at 2.31 by 2 by 0.63 inches
- Useful in sets for odd-shaped work
- Long-standing shop tool with a big installed base
- Carries to field jobs easily
Cons
- 25 lb pull force limits heavy workpieces
- Fixed angles only with no protractor scale
- Lowest average rating in this roundup at 4.3
The mini magnet square is the one I reach for when a full-size square will not fit. At 2.31 inches long, 2 inches wide and 0.63 inches thick, it slides into a closed channel or behind a flange where nothing else will go, and it comes in a six-piece pack so you can hold several points at once.
What makes it useful is the angle coverage: 30, 60, 45 and 90 degrees on a small round body. That 30 degree face is not something most of the other picks here offer, and it is genuinely handy for bracing and angled struts.
This is light-duty holding, and I want to be straight about that. At 25 lbs of rated pull force, it is for sheet, thin tube and light material. Reviewers are consistent on this point: the size is the selling feature and the force is the limit.
There is no adjustable scale and no lever. The angles are machined into the body, which means it either matches your joint or it does not, and switching it off means physically sliding it off the workpiece.
When this magnet is the right call
Reach for it in confined spaces: inside a box, between two walls of channel, on a tube that sits close to a frame you cannot move. In multiples it handles odd shapes better than any single larger tool, because you can place two where one big square would be in the way.
The six-pack format also makes it a good field kit. It weighs almost nothing and it survives being tossed into a truck bed, which matters for pipe fitting and field repair work.
When to buy something else
Skip it for plate welding and heavy tube. Below about 1/8 inch material it creeps, and the modest 4.3 average rating reflects how many buyers discovered that.
If your joint geometry is unusual rather than standard, look at an adjustable model instead. Fixed faces at 30, 45, 60 and 90 will not cover a tapered or non-standard angle.
3. Strong Hand MSA46-HD Adjust-O Square – Best Heavy-Duty Switchable
Strong Hand Tools Adjust-O Heavy Duty Magnetic Welding Square, 90 lb Pull Force, On/Off Switch, Double Plate, 30°/60°, 45° & 90° Angles, 4.4 x 3.8 x 1.1 in., MSA46-HD
On/off magnetic switch
65 lb rated pull force, 90 lbs in bullets
4.38 by 3.75 by 1.13 inch body
Pros
- On/off switch speeds setup and prevents accidental release
- Switching off makes chip cleanup a quick wipe
- Accurate 45 and 90 degree holding on tubing and flat bar
- Solid metal body rated for repeated shop use
Cons
- Fixed 45 and 90 degree geometry only
- Rated pull is listed differently in different places on the listing
- No adjustable scale or protractor to set an odd angle
This is the pick I recommend to anyone who asked for a welding magnet with an on/off switch and does not want to jump to the top of the price range. The lever on the front kills the magnetic field, the square lets go, and the chips fall away instead of staying welded to the tool.
It holds work at 45 and 90 degrees across round and square tubing, angle iron and flat bar. The body is 4-3/8 by 3-3/4 by 1-1/8 inches and 0.7 kg, so it has real mass in it, which helps it stay put on larger material than the mini squares can manage.
One thing to know before you buy: the listing is inconsistent about force. The product details list 65 lbs of pull force and the feature bullets say 90 lbs. Both numbers exist on the same page, so treat them as marketing rather than measurement and derate either one before committing to heavy plate.
The fixed geometry is the other constraint. There is no pivot and no scale, so this covers the two angles you use most and nothing beyond them. Buyers who need tapered or non-standard angles move up to an adjustable model instead.
When this magnet is the right call
It fits shops where weld spatter and grinding dust are constant and cleanup time is real. Switching the magnet off and wiping it takes seconds, where a permanent square means picking swarf out of the seam with a glove every time you release it.
It is also a strong choice for repeat tube and angle iron work where the joint is always the same two angles. Set it, switch on, tack, switch off, reposition.
When to buy something else
If your work includes 30 degree, 135 degree or anything off-standard, this is the wrong shape. Look at the MLA600 for a wide pivot range or the YESWELDER AJM-M for 20 to 200 degrees.
Skip it for 1/4 inch plate and structural work where you need to break a strong hold without a pry bar. A lever-only release is not enough when the joint is heavy.
4. Strong Hand MLA600 Adjustable Angle Square – Best Wide-Range Adjuster
Strong Hand Tools MLA600 Adjustable Angle Magnetic Welding Square, Inside/Outside Magnets, Angle Setting Pin, Magnetic Pull Force 33 Lbs, Welding Square, 30°-270° Angle, 6″ Size
Adjustable 30 to 270 degrees
Two independent magnets for inside and outside force
9 by 6 by 1 inch, 0.9 kg
Pros
- Widest angle range among the Strong Hand squares here
- Two-magnet build keeps force consistent on inside and outside angles
- Angle setting pin repeats the same angle across pieces
- Mounting holes let two squares link as one fixture
Cons
- 33 lb pull force is modest for heavy plate
- Hex hole breakaway is needed to release from thick steel
- Large body is heavy for tight work
The MLA600 is the one I reach for when the joint is not square. It pivots from 30 through 270 degrees, so it covers everything from a shallow tapered brace to an obtuse corner, and the 9 by 6 inch body gives you plenty of reference face to square against.
Two design details set it apart. It uses two independent magnets so the inside and outside faces hold consistently rather than the force dropping off on one side, and it has an angle setting pin that lets you set an angle, lock it, then repeat it exactly on the next piece.
For production work the setting pin and the mounting holes are the real story. Drill or bolt two of these together and you have a repeatable fixture rather than a hand-held tool, which is how repeatability enters a shop that is otherwise measuring every joint by eye.
The limitation is force. Thirty-three pounds of rated pull handles sheet metal, round pipe, square tube and framing sections well, and it is not the tool for 1/4 inch plate or heavy structural. There is a hex hole in the magnet that gives you extra torque to break it free from thick steel, and you will use it.
When this magnet is the right call
Any job with a non-standard angle: tapered legs on a table, mitered frame corners, an odd gusset cut, a stair stringer profile. The 30 to 270 degree range means you are not hunting for a different tool each time the drawing changes.
It is also strong for repeat batches once you mark the angle on the body. Set the pin, weld a full batch, then reset for the next one.
When to buy something else
Do not expect it to hold heavy plate. At 33 lbs it is a positioning tool for mid-weight material, and reviewers consistently report needing the breakaway hex for anything thick.
If your only joints are 45 and 90 degrees, a fixed square will be simpler, lighter and cheaper, and you will reach for it more often.
5. Magswitch 300 Amp Switchable Magnetic Welding Ground Clamp – Best Magnetic Ground Clamp
Magswitch 300 Amp Switchable Magnetic Welding Ground Clamp
300 amp switchable grounding
200 lb breakaway magnetic hold
Finned body, 439 g, model 8100746
Pros
- Instant on/off grounding with no clamp to attach or detach
- Seats on flat plate and round pipe alike
- Finned housing runs cooler on long duty cycles
- Wipes clean of spatter and shavings
Cons
- Costs more than a standard ground clamp
- Needs a reasonably large steel surface to seat properly
- Only works on ferrous workpieces
Every other pick on this list holds a joint together. This one solves a different problem: the ground connection. A standard ground clamp is a spring jaw you have to physically clamp onto the workpiece, and on a hot pipe or an awkward plate it is a two-handed fight every time you reposition.
The Magswitch 300 Amp version replaces the jaw with a switchable magnetic contact rated at 300 amps and 200 lbs of breakaway hold. You set it on flat or round steel, flip it on, and weld. When you move, flip it off and it lets go.
The finned body is the detail worth noting. It is designed to run cooler through long duty cycles, which matters if you are doing production work in one position all afternoon. At 2.9 by 1.9 by 2.3 inches and 439 g it is small and light enough to move with one hand.
Two limitations show up in reviews. It costs more than a conventional ground clamp, which is real when you are outfitting a shop. And it needs a big enough steel surface to seat properly, so thin sheet or a narrow edge is not where it works best.
When this clamp is the right call
It shines on pipe and plate work where you reposition constantly, and on long seams where a spring clamp can slip or get too hot to keep touching. Fabricators report reaching for it specifically to stop wrestling the clamp.
It is also a good match with switchable fixturing magnets, since the whole setup releases with a lever and nothing sticks to the workpiece.
When to buy something else
If you weld mostly thin sheet or aluminum, this is the wrong tool twice over. Aluminum and stainless will not hold a magnetic contact at all, and thin sheet does not give the clamp a solid seat.
If you do occasional work and your ground clamp is fine, the upgrade is hard to justify. This one pays off in volume.
6. FastCap MagMicroSquare – Best for Checking Angles
FastCap MAGMICROSQUAR Precision Machinist Style Magnetic Micro Square
Two rare-earth magnets in the base
Metric and inch scales at 1 mm graduation
6 by 3.5 inch body, 5.6 oz
Pros
- Sticks to cast-iron tabletops for hands-free setup
- Weighs 5.6 oz and fits in a pocket
- Metric and inch scales read in one pass
- Doubles as a storage magnet on the side of a saw
Cons
- Tolerance is too loose for precision lathe work
- No hold on non-ferrous or composite saw tops
- Sharp corners out of the box
- Rare-earth base can crack if dropped
This one is not a fixturing magnet and I want to be clear about that up front. It is a machinist-style magnetic micro square that sticks to a cast-iron tabletop and lets you check angles hands-free, which is a genuinely different job from holding a joint.
Two rare-earth magnets are embedded in the base. Stick it to a table saw top or a drill press table and it stays put while you bring a blade or a workpiece into it. The scales are marked in both metric and inch with 1 mm graduation.
As a rough setup checker it is excellent. Reviewers use it for verifying 90 degrees on saw blades, band saws and drill press tables, and the embedded magnets double as a way to store it on the side of a saw between uses.
Where it falls down is precision. Some buyers report it measuring off by roughly 0.7 mm over 4 inches, which is fine for woodworking and rough setup and not fine for lathe cross-slide work. Sharp corners out of the box and a base that can crack if you drop it are the other complaints.
When this tool is the right call
Use it to set up machines and verify rough angles, and to check a magnet or jig you have just assembled. The hands-free hold on cast iron is what makes it fast, since you are not chasing a falling square with a third hand.
It is the easiest pick here to keep in a pocket, at 5.6 oz, which makes it a good carry-around shop reference.
When to buy something else
Do not buy it to hold a weld joint. That is not what it does, and the low-rated magnets in the base are not built for the load.
Skip it entirely if you need precision or if your machine has a non-ferrous or composite surface. It will not stick, and the accuracy will not hold up to work that needs thousandths.
7. Magswitch MagSquare 150 – Best Compact Switchable Square
Magswitch MagSquare 165 Switchable Magnetic Square – 165 lb Hold
150 lb rated holding force
True on/off switch, five-sided grip
Pre-tapped holes, alloy steel, 11.2 oz
Pros
- 150 lb rated hold from a body weighing 11.2 oz
- True on/off release with no prying
- Five-sided grip suits fit-up
- de-stacking and stops
- No power source needed
- Pre-tapped mounting holes for custom fixtures
Cons
- Footprint is smaller than buyers expect
- Does not reach full rated force on thin sheet
- Strong field can affect an arc if set too close to the bead
The MagSquare 150 is a switchable square with almost no bulk in it, and the one I reach for when I want switchable behavior without a bulky body. It lists 150 lbs of rated holding force at 11.2 ounces, in an alloy steel housing with a real on/off lever.
The magnetic grip works on five sides rather than one, so it can be used for fit-up, sheet leveling, de-stacking material and even as a stop on a saw table. That range of uses is why fabricators like it, and the pre-tapped holes let you bolt it into a fixture.
The most common reaction to this one is surprise at the size. Buyers expecting a 3 by 4 inch square find something noticeably more compact, which is good for carrying and awkward joints but means less reference face on a big joint.
Two honest limits. On thin sheet metal it does not reach its full rated force, because there is not enough material for the flux circuit. And a field this strong can affect a welding arc if you set it too close to the bead, so keep it back from the joint.
When this square is the right call
It suits fit-up work on plate and structural where you want the release without a lever fight, and it is the best pick here for de-stacking or handling sheet without a crane.
Because it needs no power, it works anywhere in the shop with no hookup, which also makes it good for field and site repair work.
When to buy something else
Thin sheet metal is the weak spot. If your work is mostly light gauge, the reduced hold makes a lighter arrow magnet a better tool.
It is also the premium-priced tool in this roundup, so if your joints are all 45 and 90 degrees on ordinary tube, a fixed square will serve you at a lower cost.
8. YESWELDER AJM-M Adjustable Angle Magnet – Best for Obtuse Joints
YESWELDER Adjustable Angle Welding Magnet 20-200° Welding Magnet of 77LBs
Up to 77 lbs holding force
Adjustable 20 to 200 degrees
Scale display with hex lock, 15.8 oz
Pros
- 20 to 200 degree range covers obtuse and acute joints
- Included hex wrench locks the angle setting
- Compact body fits tight spaces
- Strong hold on small and medium tubing
Cons
- Angle markings on the scale are very small
- Rated pull strength is overstated in practice
- Will not hold heavy sections such as long lengths of angle iron alone
This adjustable magnet covers 20 to 200 degrees, which makes it the pick for obtuse and acute joints that other squares here cannot reach. It weighs 15.8 ounces and comes with a hex wrench that locks the angle once you set it.
The scale display is the useful part. You dial the angle, tighten the hex lock, and the setting holds through the weld. For a batch of identical odd-angle joints that saves you re-measuring on every piece.
Reviews describe it as a good second pair of hands for small and medium tube work, and the compact body is a genuine advantage where a larger square will not fit into the joint.
Two complaints come up consistently. The angle markings on the scale are very small and hard to read, so you will be squinting at them. And the 77 lb rating is overstated in practice, particularly on anything heavy. The manufacturer also advises against welding too close to the magnet.
When this magnet is the right call
It is the right tool when your joints run past 90 degrees or well under it, and when you repeat the same odd angle across several pieces. The hex lock is what makes it a fixture rather than a guess.
For light and medium tube it is a strong performer, and it is small enough to carry between benches.
When to buy something else
Heavy sections are out. Reviewers specifically report it will not hold long lengths of 2 by 2 angle iron on its own, and a magnet that moves during a tack on heavy material is worse than no magnet.
If you mostly work at 45 and 90 degrees, a fixed square is simpler and will not lose its setting. Save this one for the angles nothing else covers.
9. ARCCAPTAIN 25 lb and 55 lb Four-Piece Set – Best Budget Set
ARCCAPTAIN Welding Magnets 25LB & 55LB 4Pcs Welding Magnet Set
Four pieces mixing 25 lb and 55 lb pull
45, 90 and 135 degree arrow design
Alloy steel, riveted frame, model AR005
Pros
- Mixed 25 lb and 55 lb magnets cover light and heavier work
- Steel-encased riveted frames resist welding heat
- Four pieces allow multi-point holding during a weld
- 4.6 stars from 346 reviewers
Cons
- Fixed 45/90/135 geometry only
- No on/off switch means prying to release
- Traps grinding dust and swarf in the joint
The ARCCAPTAIN set does something the other four-piece option here does not: it mixes strengths. You get a mix of 25 lb and 55 lb magnets in one pack, so the light ones handle thin sheet and the heavy ones take the heavier joints in the same setup.
The frames are steel-encased and riveted rather than molded, and that detail matters more than it sounds. Reviewers note they stand up to welding heat better than plastic-bodied magnets, which is the failure mode that ends cheap tools early.
That is the whole case for it. It is a four-piece set with a heat-resistant body, mixed strengths and a 4.6 star average, and for a home shop or a first kit it covers a lot of ground.
The tradeoffs are the same ones every permanent magnet has. Fixed 45, 90 and 135 degree geometry only, no on/off switch, so release means physically prying the pieces apart, and swarf collects in the joint until you clean it by hand.
When this set is the right call
It is the sensible starting kit for a home shop or a hobby fabricator building frames and gussets on mild steel. The mixed strengths mean you are not trying to make a 25 lb magnet do a 55 lb job.
It is also worth having as shop consumables, because permanent magnets that take a hit do not usually break, they just get replaced.
When to buy something else
If you weld thin sheet all day and clean up constantly, the lack of an on/off switch will wear on you. A switchable square solves that specific annoyance.
And for 1/4 inch plate or structural work, neither strength in this set is the right answer. Buy force for that, not convenience.
10. Magswitch MagJig 150 – Best for Building Your Own Jigs
Magswitch MagJig 150 Switchable Magnetic Hold-Down – 150 lb Force
150 lb holding force with on/off switch
3/4 inch standoff for flush mounting
Screw holes for fixture security, 0.25 kg
Pros
- Real downward clamping force when built into a jig or sled
- On/off switch releases without prying
- Chips and dust fall away when switched off
- 3/4 inch standoff lets it sit flush in a drilled pocket
Cons
- Needs a drilled hole or mounting pocket to work
- Requires a thick ferrous surface to pull against
- Less useful as a general-purpose clamp
The MagJig 150 is the only pick here that is a hold-down rather than an angle tool. It delivers 150 lbs of downward force, and it has a 3/4 inch standoff that lets it sit flush inside a drilled pocket in a jig plate or sled.
That is the whole idea. Drill a hole in your fixture, drop the jig in, and you get switchable clamping force that releases with a lever and sheds chips when you turn it off. It needs no power source.
Users who build their own jigs and sleds value it for exactly that, and the screw holes add extra security once it is mounted. At 2.61 by 2.1 by 1.7 inches and 0.25 kg it is small and easy to place in several pockets across a plate.
It is a specialist tool. It needs a drilled fixture and a thick ferrous surface to pull against, so as a general-purpose clamp for one-off work it is not the answer, and it costs more than a mechanical hold-down.
When this hold-down is the right call
Once you are past one-off jobs and repeating the same fit-up, a fixture plate with several MagJig pockets pays for itself quickly. Every position becomes repeatable and every release is a lever pull instead of a fight.
It also works well for welding and woodworking fixtures alike, in the same way a right angle or corner clamp would.
When to buy something else
If you do not build fixtures, this one will sit unused in a drawer. Get an angle magnet instead, which will help you on nearly every job.
It also needs a reasonably thick ferrous surface to pull against, so it is not useful on thin gauge or non-ferrous work.
What to Look For When Buying a Welding Magnet
Most buyers choose on rated pull force and then wonder why the tool will not hold. Here is what actually matters, in the order I would weigh it.
Pull force, and the derating rule
Rated pull force is measured with the magnet face flat against a thick steel plate. On a 90-degree joint, the geometry works against you and you get a fraction of that number. Multiply the rated force by two or three before you compare it to your workpiece, and expect less than the rating in practice.
Rough guide by workpiece: thin sheet needs the least and a spacing or micro magnet handles it fine. Tube up to about 1/8 inch wall works with a 25 to 50 lb arrow magnet. Quarter inch plate and structural want a switchable square in the 65 to 150 lb range, and you may still want a second magnet on the joint.
Angle coverage and accuracy
Decide your most common angles before you buy. Fixed arrow magnets cover 45, 90 and 135. Adjustable models cover far more, from 20 or 30 degrees up through 200 or 270. If you weld tapered legs or odd miters, an adjustable magnet saves you a second tool later.
Angle accuracy varies more than buyers expect. Budget arrow magnets are frequently printed to a face that is not a true 90 degrees, so check with a machinist square on the first joint and correct it rather than assuming the marking is right.
Switchable on/off design
This is the single biggest purchase decision in the category, and it is what separates the premium picks from the budget ones. Switchable magnets release on demand, drop chips instead of collecting them, and stop holding swarf against your workpiece.
Permanent magnets are cheaper and simpler, but release means prying and cleanup means picking swarf out of the seam with a glove. Forum discussions on this topic return to that trade constantly, and it matters more on a cluttered shop floor than the price difference suggests.
Heat resistance and the material limit
Ferrous only is the hard rule. Aluminum, copper and 304 or 316 stainless will not hold at all. Within the 400 series stainless, some grades are magnetic and some are not, so test before you plan a job around it.
On heat, ferrite elements start losing strength around 500 F and can lose their magnetism above 600 F. Keep magnets away from the weld and let them cool rather than leaving one clamped through a long pass.
Starter kit for a small shop
If you are starting out, buy in this order: a four-piece arrow magnet set for general tube and gusset work, one switchable square for plate and any joint where you must get it off cleanly, one adjustable model if you weld any non-standard angle, and a magnetic ground clamp if you pipe. Four tools cover nearly everything a small fabrication shop does.
Magnets vs. Welding Clamps: When Each One Wins
Magnets are faster. Clamps are more predictable under load. Which one wins depends entirely on the workload in front of you.
Magnet wins
Magnets win on 90-degree tube and angle iron frames, on sheet metal alignment where a clamp jaw would mar the surface, on overhead and vertical work where your hands are busy, and anywhere you need to reposition constantly. They also win on repeat jobs, because a magnet drops into place in seconds and a clamp needs the jaw adjusted each time.
Clamp win
Clamps win on heavy plate, where a fixed mechanical jaw beats a magnet with no release. They win on non-ferrous work, since a magnet will not hold aluminum or stainless at all. And they win when you need to apply controlled, adjustable pressure over a long joint rather than a fixed magnetic hold.
The honest answer for most shops is that the two are not competitors. A four-piece arrow set for fit-up and a couple of clamps for heavy hold-downs covers more ground than either alone.
Arc Blow: How Magnets Change Your Weld
A magnet sitting next to a live arc creates a magnetic field that deflects the arc, which is called arc blow. You see it as a wandering, spatter-heavy bead that is hard to clean and inconsistent through the joint. It is more common on DC stick and DC TIG than on MIG.
The protocol is straightforward. Keep the magnet 3 to 4 inches back from the weld joint, and place it on the opposite side of the workpiece from the arc where you can. If you must clamp close, use a ground clamp as the return path to steer the field away from the bead.
Strong switchable magnets need this respect more than cheap ones. A 150 lb rated square produces enough field to affect the arc, which is why the manufacturer warnings on the higher-force picks are worth reading before you set one next to a joint. If your bead is wandering and you cannot see why, move the magnet first and re-run the pass.
Frequently Asked Questions
What are the different types of welding magnets?
The main types are fixed-angle arrow magnets (45, 90 and 135 degree faces), switchable magnetic squares with an on/off lever, adjustable-angle magnets that pivot across a wide range, multi-angle positioners with interchangeable angle blocks, sheet-metal spacing magnets for gap control, and magnetic ground clamps. Arrow magnets are cheapest and cover the three standard angles. Switchable squares cost more but release cleanly and drop chips. Adjustable models handle non-standard geometry. Magnetic ground clamps replace a spring jaw on the workpiece.
Are there welding magnets with an on/off switch?
Yes. Switchable welding magnets use a lever to control the magnetic circuit: on, flux routes through the workpiece and the tool grips five-sided; off, the circuit is short-circuited inside the housing and the tool releases with no prying. The benefit is clean removal and chip cleanup, since swarf falls off instead of clinging. Permanent magnets never release on command, which is why they are cheaper and need manual chip removal.
How many lbs of pull force do I need for welding?
Derate the rated number by two to three before comparing it to your workpiece, and expect less than the rating at a 90-degree joint. Thin sheet needs very little. Tube up to about 1/8 inch wall works with a 25 to 50 lb arrow magnet. Quarter inch plate and structural want a switchable square rated 65 to 150 lbs, usually with a second magnet on the joint.
Can you weld stainless steel with a magnetic square?
Usually not, and it depends on the grade. 304 and 316 stainless are austenitic and essentially non-magnetic, so a welding magnet will not hold them at all. Some 400 series stainless grades are magnetic and will hold. Aluminum and copper are non-ferrous and will not hold either. If your work is non-ferrous, a clamp is the only option.
Will a welding magnet affect my weld?
Yes, if it sits too close to the arc. A strong magnet near the joint creates a field that deflects the arc, producing a wandering, spatter-heavy bead. Keep the magnet 3 to 4 inches back from the joint and on the opposite side of the workpiece where possible. The problem is more common on DC stick and DC TIG than on MIG. If your bead is inconsistent, moving the magnet is the first thing to try.
The Best Welding Magnets for Fabrication: Bottom Line
The best welding magnets for fabrication depend on the joints, not the brand. For general tube and gusset work, the four-piece YESWELDER set is the strongest all-round buy in this roundup, with the highest rating and enough magnets to hold several points at once. Add a switchable square for any joint you need to release cleanly, an adjustable model if you weld odd angles, and a magnetic ground clamp if you pipe.
Start with the cheapest set that covers your common angles, then add force and adjustability only where your actual work needs them. Check every joint with a machinist square on the first piece, keep magnets back from the arc, and re-review this list as your shop takes on heavier work. If you are still kitting out the bench, our welding helmet and welding glove roundups cover the other two things you wear every day.