Spot Welding Arms

$101.46 ~~$317.93~~ In stock

All spot welding arm electrodes measure 12 mm in diameter and will fit any spot welder that accepts .0787" (20 mm) spot welding arms.

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Standard Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

Express Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

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Standard Shipping · United States: $0.00

Express Shipping · United States: $3.99

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United States · Return window (days after delivery): 30. Return method: By mail. Return postage: Seller pays.

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Customer Reviews (4.8 / 5 · 5 reviews)

Robert Y. ★★★★★ Oct 22, 2026

I was a little worried about the fit, but the 12mm diameter is exactly what my old spot welder needed. These arms slid right in with no fuss, and the solid feel gives me confidence for battery pack builds.

Eva K. ★★★★★ Oct 21, 2026

Finally got these 12mm arms swapped in and they fit my machine perfectly without any shims. The thicker diameter feels more solid during welds and the connection stays secure through a full battery pack build.

Evelyn ★★★★★ Oct 20, 2026

Installed these 12mm arms on my spot welder and they locked in perfectly with zero wiggle. The first few welds came out cleaner than my old arms ever managed.