CMS Magnetics Welding Holder Review
There’s a moment every hobby welder knows:you’ve got two pieces of angle iron you need to tack at 90 degrees, no extra hands, and you’re trying to balance one piece against the other while reaching for the torch. You either use a third clamp you don’t have room for or you accept that the corner is going to be slightly off and fix it later with a grinder. Welding magnets exist to solve this problem, and the CMS Magnetics 4-piece set is one of the longest-running options in this space.
CMS Magnetics (sold through Amazon under their own brand, with products also available via their direct site magnet4sale.com) makes a line of welding holder magnets in several holding-power classes. The most widely stocked version on Amazon is the 4-piece set at 25 pounds of holding force per piece. This review covers that set, how it compares to YESWELDER, and who it’s right for.
A CMS Magnetics welding holder is a ceramic magnet enclosed in a red powder-coated steel housing. The housing geometry creates three holding angles: 45, 90, and 135 degrees. You press the flat face of the magnet against your steel, the magnetic field pulls it in, and the housing holds your workpiece at the angle you need. No on/off switch, no moving parts. The red coating protects the steel housing from rust and protects your workpiece from scratches.
Bottom line before the detail: the CMS Magnetics 25 lb set is a reliable, honestly specified tool for light to medium plate tacking. It’s not the most powerful option in this class, but it’s one of the few at this price point that gives you a real, verified holding force number to work with before you buy.
Build and Specs: What CMS Actually Delivers
The 4-piece set contains four identical welding holder magnets. Each one is rectangular, approximately 4.75 by 3.25 inches with a 0.63-inch thickness. The ceramic magnet core provides 25 pounds of holding force at the 90-degree position - this is the maximum, at the optimal contact geometry. At 45 and 135 degrees, the contact area changes and effective force is somewhat lower.
The red powder coat is a practical feature, not just cosmetic. Bare steel magnets in a weld shop accumulate rust and leave rust marks on the workpieces they touch. The coating prevents both. It also makes the magnets easier to spot when they get pushed to the back of a shelf.
The shape creates the three standard welding angles. At 90 degrees, you place the magnet flat against one face and let the adjacent face hold the other piece. At 45 and 135 degrees, the angled edges of the housing establish those positions. The geometry is fixed and simple - there’s nothing to adjust, set, or calibrate.
Named flaw: 25 pounds of holding force is the rated maximum on a clean, flat steel surface. On smaller-diameter tube or pipe, the contact area shrinks and effective force drops. On a surface with scale, coating, or debris, effective force drops further. For light sheet metal or angle iron, 25 lbs is comfortable. For heavier plate, structural tubing, or any joint where thermal distortion from welding will pull against the magnet, 25 lbs is marginal. You’ll want more holders per joint, or a higher-rated product.
Is CMS Magnetics a Reliable Brand?
CMS Magnetics has been selling on Amazon since the early days of the platform. Their welding holder (B000UD16VO) has accumulated a substantial review history that reflects consistent product delivery over time. The brand doesn’t produce welding equipment - they produce magnets and magnetic products across many categories - but the welding holder line has been stable in spec and form for years.
What you get with CMS is a brand that publishes its holding force specification (25 lbs), ships a consistent product, and has a multi-year track record at the same ASIN. That’s more than can be said for a significant number of no-name magnetic welding holders that rotate through Amazon with new listings and no performance history.
The honest context: CMS Magnetics sits below the performance tier of Strong Hand Tools and MAG-MATE, and at the same tier as YESWELDER’s 25 lb set. At the 50 lb holding force tier, YESWELDER’s B08FHS2VFP is the strongest direct comparison.
CMS Magnetics 25 LB vs. YESWELDER 25 LB and 50 LB
YESWELDER makes two welding magnet sets that compare directly:
- YESWELDER 25 lb 4-piece (B08FHS8H38): same holding force, arrow-shaped design vs. the CMS rectangular form
- YESWELDER 50 lb 4-piece (B08FHS2VFP): double the holding force for heavier work
At the 25 lb tier, both the CMS Magnetics and YESWELDER sets deliver similar holding capacity. The main practical difference is shape: the CMS holders are rectangular blocks, while the YESWELDER are arrow-shaped. The arrow design gives the YESWELDER magnets slightly better contact on tube and pipe because the pointed end can press against curved surfaces more effectively. The CMS rectangular form gives better stability on wide flat plate.
If your work is consistently flat plate with right-angle joints, the CMS holders are equally capable. If you weld a lot of tube and pipe, the YESWELDER arrow shape has a small advantage.
For work that gets heavier than light plate, the YESWELDER 50 lb set (B08FHS2VFP) is the clear upgrade path. Double the holding force at a modest price increase.
Comparison Table
| Product | Hold Force | Shape | Coating | Switch | Best For |
|---|---|---|---|---|---|
| CMS Magnetics 25 lb | 25 lbs | Rectangular | Red powder coat | No | Flat plate, light fab |
| YESWELDER 25 lb | 25 lbs | Arrow | Black | No | Tube/pipe and flat plate |
| YESWELDER 50 lb | 50 lbs | Arrow | Black | No | Medium to heavier plate |
When the 4-Piece Count Matters
Four holders in a set is not arbitrary. When you’re tacking a rectangular frame, you want all four corners held simultaneously before you make any tacks. If you only have two magnets, you tack two corners, the frame shifts as it cools, and the other two corners are now slightly off. Four holders means four simultaneous placements, all four corners tacked in one pass, before any thermal distortion has a chance to skew the geometry.
For a square or rectangular project, four is the minimum. For larger or more complex structures, buy two sets and keep eight holders on hand.
Practical Tips for Getting the Most from Ceramic Welding Magnets
Ceramic magnets are stable - they don’t demagnetize easily under normal welding shop conditions. But they’re also brittle. Dropping a ceramic magnet on concrete can crack the core. The steel housing of the CMS holder protects the ceramic inside, but it’s still not a hammer. Don’t use it as one.
Keep the contact faces clean. Always-on magnets in a weld shop accumulate steel chips and spatter on the magnetic faces. That debris reduces effective contact area and reduces holding force. A quick wipe with a rag and occasional wire-brushing of the face keeps the magnets performing close to spec.
Grind or clean the surface where you place the magnet. 25 lbs of rated force is on a clean, bare steel surface. Heavy mill scale, rust, or paint reduces that. A few passes with a flap disc on the contact area takes two minutes and makes the magnet grip reliably.
FAQ
Is CMS Magnetics a reliable welding magnet brand? Yes, for the price tier. CMS Magnetics has a consistent track record on Amazon with the same product and published specs. They sell ceramic welding holders, not industrial-grade magnets, but the 25 lb set does what it specifies reliably. For a step up in performance, look at YESWELDER’s 50 lb set or Strong Hand Tools.
How does CMS Magnetics compare to YESWELDER? At the 25 lb holding force tier, they’re comparable. YESWELDER’s arrow shape has a slight advantage on curved surfaces like pipe; the CMS rectangular form is more stable on flat plate. YESWELDER also makes a 50 lb version that doubles the holding force if you need more.
What is the holding power rating for CMS Magnetics welding holders? The 4-piece set (B000UD16VO) is rated at 25 pounds of holding force per piece at the 90-degree position on a clean flat steel surface. This is the maximum rated force; expect somewhat less on tube, pipe, or surfaces with scale or debris.
Do I need a 4-piece set or will 2 magnets work? For any rectangular or square frame, four holders lets you secure all corners simultaneously before tacking. Two holders means you tack in stages, which introduces the risk of thermal distortion shifting the geometry between the first and second pair of tacks. Buy four.
Can I use these on aluminum, stainless, or non-ferrous metal? No. Ceramic (and all permanent) magnets only grip ferrous steel and iron. They do not hold on aluminum, stainless steel, copper, brass, or other non-ferrous materials.
Why is the powder coat color red? Red is the traditional color for CMS Magnetics’ welding holder line. Functionally, the powder coat prevents rust on the steel housing and prevents the housing from leaving rust marks on workpieces. The color also makes the holders easy to spot in a busy shop.
Are ceramic magnets safe near welding arcs? Yes, with normal positioning. Keep magnets away from the weld zone itself - both to prevent arc blow (the arc can deflect toward or away from a strong magnetic field) and to prevent heat degradation of the magnet. Place holders a few inches from the actual weld seam and you’ll have no issues.
References
- American Welding Society - Welding Safety
- CMS Magnetics / Magnet4Sale direct product information (magnet4sale.com)
- Miller Electric welding resources (millerwelds.com)
- Lincoln Electric how-to guides (lincolnelectric.com)
