Key takeaways
- Best welding clamps for sheet metal: six butt clamp and locking pliers sets compared by count, size and use, plus fit-up and tacking tips.
What's inside
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For most auto body and sheet metal repairs, the Pumtus 24-piece butt welding clamp set is the best overall pick here: it gives you enough butterfly-style clamps to hold a long seam edge to edge in one setup, at a size that suits thin panels. Butt welding clamps are small spring-loaded clamps that pull two sheet edges flush, or hold them at a consistent gap, so you can tack them before welding. Five of the six sets below are that type; the last, a pair of U-shaped locking pliers, is included as a runner-up for heavier holding jobs and is explained plainly in its own section.
What we cover
Quick List
- Pumtus 24-piece butt clamps – best for long seams and full panel repairs
- MYFULLY 16-pack butt clamps – best for a mid-size set that covers most patch jobs
- KOHAND 24-pack butterfly clamps – best for stocking up on clamps with a stated 2.3 by 1 inch size
- AYWGZL 4-piece panel clamps – best for small patch repairs and door alignment
- KASCLINO 8-piece butterfly clamps – best for a compact starter set that also mentions a magnetic ground clamp
- AMGSH 9-inch U-shaped locking pliers (runner-up) – best as an accessory for holding thicker or larger workpieces, not for butt joints
Which One Is Right for You?
| If you… | Choose |
|---|---|
| Are replacing a long rocker, quarter-panel or floor seam and need many clamps at once | Pumtus 24-piece set or KOHAND 24-pack |
| Want a balanced quantity without buying two dozen | MYFULLY 16-pack |
| Only do small patches or need to line up a door edge | AYWGZL 4-piece set |
| Want a compact starter set and a magnetic ground option mentioned in the listing | KASCLINO 8-piece set |
| Care about knowing the clamp size before you order | KOHAND 24-pack (2.3 by 1 inch in the listing) |
| Need to hold thicker plate, tubing or a fixture to a bench | AMGSH 9-inch locking pliers |
Think in terms of seam length: a clamp roughly every two to four inches along an edge is a common starting point, so a 24-piece set covers a seam of about four to six feet in one pass, while a four-piece set is better for a small patch. Buy more than you think you need, because clamps migrate to every job in the shop.
All 6 Picks in Detail
1. Pumtus 24-Piece Butt Welding Clamps – Best for Long Seams and Full Panel Repairs
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Pumtus supplies 24 butt welding clamps described in the listing as sheet metal welding clips and auto body panel clamps for edge-to-edge welding, with a small clamp size suited to tacking. The big count is the draw: on a long seam you want enough clamps to hold the panel flat the entire way, so you can tack from one end to the other without playing catch-up as the metal moves. This is the set to choose for rust repair on a rocker panel or replacing a lower door skin.
- 24 clamps per set
- Butt welding clamp design for edge-to-edge joints
- Sold for sheet metal and auto body panel use
- Small clamp size intended for tack welding
- Material, jaw opening and thickness range: confirm on listing
With this many clamps you can alternate sides and keep the panel from bowing as heat builds. Space the clamps evenly, tack in a skipping pattern (for example every third or fourth position) rather than in one direction, and let each area cool before returning. That approach limits the warping that thin steel is prone to.
Pros
- Enough clamps for a long continuous seam
- Edge-to-edge design suited to panel work
- Good value per clamp for frequent use
Cons
- Too many pieces if you only make small patches
- Maximum material thickness is not stated in the listing name
Compared with the KOHAND 24-pack, the Pumtus set is the closer match on quantity, while the KOHAND listing gives a clearer size spec.
2. MYFULLY 16-Pack Butt Welding Clamps – Best for a Balanced Mid-Size Set
The MYFULLY listing name is short: it identifies the product as a 16-pack of butt welding clamps and not much else. That means the details that matter, such as clamp length, jaw width and material, need to be confirmed on the product page before you buy. Sixteen clamps is a practical quantity for most home garage jobs, enough to hold a 30- to 50-inch seam at moderate spacing or to hold a patch panel from all four sides.
- 16 butt welding clamps per pack
- Butt-clamp design for edge-to-edge sheet metal joints
- Clamp dimensions and jaw range: confirm on listing
- Material and finish: confirm on listing
- Included storage or extras: confirm on listing
Sixteen is a number that scales well. It is enough to align a floor pan section, yet small enough to store in a coffee can on the bench. If you discover you want more later, you can add a second pack in the same style, though sizes between brands may vary slightly. Check how far the spring opens before using it on doubled-up panel edges.
Pros
- Handy quantity for most patch and seam jobs
- Straightforward butt-clamp format
- Easier to store than a two-dozen set
Cons
- The listing name offers almost no specs
- May run short on very long seams
Compared with the Pumtus set, it gives up eight clamps in exchange for a smaller footprint and an easier fit for casual use.
3. KOHAND 24-Pack Butt Welding Clamps – Best for a Stated 2.3 by 1 Inch Size
KOHAND advertises 24 butterfly-shaped small clamps in a 2.3 by 1 inch size, described as multifunctional auto body panel clamps for edge-to-edge welding. Having a size in the title helps a lot: you can hold the number up against your panel flange and judge whether the clamp jaws will fit. This pack is a natural fit for body shops and restoration hobbyists who want a lot of clamps and want to know their footprint before ordering.
- 24 clamps per pack
- Stated size of 2.3 by 1 inch
- Butterfly-shaped small clamp for auto body panels
- Designed for edge-to-edge welding
- Material, spring strength and thickness range: confirm on listing
Butterfly-shaped clamps are meant to be squeezed open with finger pressure and released to bite down on the metal edges. On thin sheet they are quick to place and move. If your panels have curved profiles, check that the clamp feet can sit flush; otherwise a curved panel may lift at the joint and leave a stepped seam that needs more grinding afterward.
Pros
- Large quantity with a size you can verify
- Easy to reposition during tacking
- Well suited to flat and gently curved panels
Cons
- Not intended for thick plate
- Material and finish are not named in the title
Compared with the Pumtus pack, it matches the count but gives a clearer dimension, so choose it if size certainty matters most.
4. AYWGZL 4-Piece Panel Clamps – Best for Small Patches and Door Alignment
The AYWGZL set contains four butt welding clamps, framed in the listing for sheet metal welding, panel clamping, patch repairs and as a door alignment tool. With only four pieces, this is not a seam-length solution. It is a small kit for the owner who occasionally fixes a dented fender, lines up a door edge before welding a hinge repair, or holds a small patch while tacking. Four clamps hold a patch at its corners.
- 4 clamps per set
- Butt welding clamp design
- Named uses: sheet metal welding, panel clamps, patch repairs, door alignment
- Jaw width, thickness range and material: confirm on listing
- Whether a storage pouch is included: confirm on listing
The practical limit is how much seam you can hold. For anything longer than a hand-width patch you will need to move the clamps repeatedly, which defeats the purpose of using them to keep a long edge flat. Think of this set as a complement to an existing collection rather than a first purchase for a full body project.
Pros
- Small and inexpensive to keep in a toolbox
- Good for patches and alignment tasks
- Simple, familiar design
Cons
- Not enough clamps for long seams
- Few specifics in the listing name
Compared with the KASCLINO 8-piece set, it offers half the clamp count, so choose it only if your jobs stay small.
5. KASCLINO 8-Piece Butterfly Clamps – Best for a Compact Starter Set
KASCLINO sells eight butt welding clamps shaped like butterflies for edge-to-edge auto body welding, and the listing name also references a magnetic ground clamp. Because the title is cut off, exactly what comes in the box beyond the eight clamps is unclear, so confirm whether a ground clamp is included before counting on it. Eight clamps is a sensible starter kit: it handles a patch panel, a small floor section or a short seam, without much cost or storage.
- 8 butterfly-shaped butt welding clamps
- Edge-to-edge auto body panel use
- Magnetic ground clamp mentioned in the listing title; confirm what is included
- Clamp size and material: confirm on listing
- Thickness range: confirm on listing
A magnetic ground clamp, if included, is a handy accessory because it lets you attach your work lead to a steel panel quickly instead of fighting with a spring clamp. Use it only on ferrous metal and keep the contact surface clean, since paint, rust or grease increases resistance and can cause poor arc starts. Remember that a magnet will not work on aluminum panels.
Pros
- Practical starter count for small to medium jobs
- Possible bonus of a magnetic ground clamp
- Easy to store and carry
Cons
- The title is incomplete, so contents need checking
- Not enough for long seams
Compared with the MYFULLY 16-pack, it provides half as many clamps but may add a ground accessory, so pick it if you need the extra tool more than the quantity.
6. AMGSH 9-Inch U-Shaped Locking Pliers (Runner-Up) – Best as a Holding Accessory
This listing is a different kind of tool: a four-pack of 9-inch locking pliers with U-shaped jaws, marketed as welding clamps. It is not a butt-joint clamp and will not pull two thin panel edges flush the way the butterfly clamps do, so treat it as a runner-up accessory rather than a direct competitor. Its value is in holding heavier or bulkier workpieces: tubing, angle, flat bar and brackets, as well as clamping a fixture to a bench or a magnet-based jig.
- 4 locking pliers per pack
- 9-inch length
- U-shaped jaws marketed for welding use
- Jaw opening, capacity and material: confirm on listing
- Not designed to align butt joints on thin sheet
Locking pliers apply high, adjustable clamping force through a toggle mechanism, which is useful for fit-up on thicker stock. The U-shaped jaws are meant to straddle round or square material. Keep them away from the weld zone, since spatter damages the jaw faces, and do not rely on them as the sole means of holding a heavy assembly that could fall.
Pros
- High clamping force for thicker material
- Handy for fixtures, tubing and brackets
- Four pieces give flexible setups
Cons
- Not a butt-clamp, so not suited to edge alignment on thin sheet
- Jaw faces can mar softer or painted panels
Compared with the AYWGZL set, it covers a different job, so buying both is a common combination.
Specs Compared
| Set | Quantity | Type | Stated size | Intended use | Material |
|---|---|---|---|---|---|
| Pumtus butt clamps | 24 | Butt welding clip | Confirm on listing | Edge-to-edge sheet metal, auto body | Confirm on listing |
| MYFULLY butt clamps | 16 | Butt welding clamp | Confirm on listing | Edge-to-edge sheet metal | Confirm on listing |
| KOHAND butterfly clamps | 24 | Butterfly-shaped butt clamp | 2.3 by 1 inch | Edge-to-edge auto body panels | Confirm on listing |
| AYWGZL panel clamps | 4 | Butt welding clamp | Confirm on listing | Patch repairs, door alignment | Confirm on listing |
| KASCLINO butterfly clamps | 8 | Butterfly-shaped butt clamp | Confirm on listing | Edge-to-edge auto body; magnetic ground clamp mentioned | Confirm on listing |
| AMGSH locking pliers | 4 | U-shaped locking pliers | 9 inches long | Holding thicker or larger workpieces | Confirm on listing |
How We Chose These
This guide comes from research and comparison of listing information, not shop trials. We looked at what each product listing and seller description states: clamp count, shape, stated dimensions, the type of joint each clamp is designed for, and any accessories named. We then weighed those details against general sheet metal fabrication guidance, which stresses holding panel edges flush, using enough clamps to keep a seam flat, and limiting heat to reduce warping. Where a listing does not state a material, thickness range or jaw opening, we say so and send you to the product page rather than guess. Sets with more clamps score higher for seam work; smaller sets are positioned for patches.
What to Look For
Clamp Type: Butt Clamp or Something Else
For thin sheet metal, the clamp style that matters most is the butt clamp, sometimes called a butterfly clamp or panel clamp. It has two feet that sit on the panel faces and a spring-loaded mechanism that pulls the edges toward each other or holds a consistent gap. Locking pliers, C-clamps and magnets each have their place, but they do not align two panel edges the way a butt clamp does. If your main task is replacing panels or patching rust holes, buy butt clamps first and add other types later.
Quantity and Spacing
A practical rule is to place a clamp every two to four inches along the joint, closer on thinner or more flexible metal. That means a 24-inch seam needs about six to twelve clamps. Worked example: you are replacing a 36-inch lower door skin edge with spacing of three inches. You need about twelve clamps to cover the full length at once, or six if you work in two halves. A 16-piece set would handle it comfortably, whereas a four-piece set would force you to relocate clamps repeatedly. Buy the quantity that fits your typical seam, then add a few spares.
Thickness Range and Jaw Reach
Most small butt clamps are intended for typical automotive body steel, often in the range of roughly 18 to 22 gauge, which is about 0.9 to 1.2 millimeters. Thicker material may not fit the foot gap or may overstress the spring. Also check how far the clamp reaches from the edge of the panel; deep flanges and doubled-over seams can prevent the feet from sitting flat. Many listings do not state these numbers, so confirm them on the product page and measure your own panel before you order.
Materials and Heat Resistance
Clamps used near welding take spatter and heat. Look for hardened or plated steel construction, a spring that does not lose tension when warmed, and feet that are easy to clean. Spatter will build up on any clamp, so a quick wipe or wire-brush after use helps. Avoid clamping directly on the hottest part of a weld; instead tack a few spots, remove clamps as you go and let the metal cool between passes. Never leave plastic-coated or painted handles close to the arc.
Storage and Care
Small clamps vanish quickly in a busy shop. A magnetic tray, a labeled tin or a pegboard hook keeps a full set together, so you can count them before and after each job. After welding, let clamps cool before handling, since the feet near a tack can stay hot enough to burn skin. Brush off spatter with a wire brush, add a drop of light oil to the pivot if the design has one, and discard any clamp whose spring no longer snaps shut firmly, because a weak clamp lets the edges drift mid-tack.
Technique Tips for Fewer Warps
Thin sheet distorts when heated. Fit the edges tightly, tack at the ends first, then at the center, then halfway between earlier tacks. Make short stitch welds an inch or less, alternate sides of the panel, and use a copper or aluminum backing bar where practical to pull heat away. A clamp that keeps the edges flush reduces the amount of grinding you need afterward. Always wear a welding helmet, flame-resistant gloves and clothing, and work in a ventilated space, particularly around coated or galvanized metal, which produces hazardous fumes.
Questions
What is a butt welding clamp used for?
A butt welding clamp holds two pieces of sheet metal edge to edge while you tack them together. It keeps the surfaces flush, which makes thin panel repair easier and reduces misalignment. It is widely used in auto body work for patch panels and seam replacement.
How many clamps do I need for a patch panel?
For a small patch, four to eight clamps are usually enough to hold each side. For a long seam, plan on a clamp every two to four inches. If you are unsure, buy a pack of sixteen or twenty-four so you always have spares.
Can these clamps be used on thick steel?
Most small butt clamps are intended for thin sheet and auto body gauges. Thicker plate typically needs locking pliers, C-clamps or fixtures. Check the thickness range on the product page, and when in doubt, use a more robust clamp for heavy material.
Do clamps get damaged by welding spatter?
Yes, spatter can stick to the feet and springs, and heat can reduce spring tension over time. Keep the clamps away from the direct weld pool where possible, brush off spatter after use, and replace any clamp that no longer holds firmly.
Is a magnetic ground clamp useful for sheet metal?
It can be, since it attaches quickly to a steel panel and avoids repeated clamp adjustments. It only works on ferrous metal, and paint or rust under the magnet increases resistance, so clean a spot first. It will not hold on aluminum or stainless grades that are non-magnetic.
Why is my sheet metal still warping with clamps?
Clamps hold position but they cannot eliminate heat distortion. Use shorter stitch welds, skip around the seam, allow cooling time and reduce amperage or wire speed. A backing bar can also help carry heat away from the panel.
Update History
- October 20, 2026 – Initial publication; product set drawn from current catalog listings.
- Check the product page for current specifications and availability before buying.
Sources
- Retailer listing titles and specification fields for each listed clamp set
- Seller and brand product descriptions where available for Pumtus, KOHAND, KASCLINO, AYWGZL, MYFULLY and AMGSH
- General sheet metal and auto body welding references on fit-up, tack spacing and distortion control
