Can i use a 7/16 bolt on this clamp instead of the 1/2 bolt

An undersized bolt can be used, but it is important to note that the bolt does not (should not) serve as the primary electrical contact. Make sure your crimped ring lead or lug on the ground wire of your welder makes direct contact with the bare aluminum area of the ground clamp frame. The steel bolt, washers, lock-washer, and nut are only intended to surround that joint and press the copper lug to the aluminum frame, maintaining good electrical contact. If you have any steel between the ground lug and the aluminum frame of the magnetic clamp, it will heat up (just like the part you are welding) and the ground clamp will not perform well (and could have a reduced lifespan).

I see these come in different amps. How do I pick the correct one? Thanks!

What's the highest amps your machine has

Has anyone used this on a cnc plasma table? if so does it work well? pros and cons please. thanks

Hello Cameron, I have a fabrication shop and use it for everything, arc, tig and plasma. On a table I would probably make sure to actually attach the ground via the supplied bolt with this product. I only clamp to it. I guess this might only be necessary depending on the amperage of your table. They state 300 amp so really should no be a problem, I wold just say it might do better bolted. Hate to screw up a long run on the table. Hope this helps son. Jack

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- 300 Amp Switchable Magnetic Welding Ground Clamp

- 300 Amp Switchable Magnetic Welding Ground Clamp

Product ID: 14890106

Details

Brand
Magswitch
Color
Yellow
Global Trade Identification Number
Item Weight
9.6 ounces
Item dimensions L x W x H
2.9 x 1.9 x
Material
Iron

⚡300 Amp Instant On/Off Power

🔥Finned Design for Cooler High-Duty Use

🧲200 lb Magnetic Hold on Flat & Round Steel

₩167261

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Description

🧲 Weld Smarter, Not Harder — Magnetize Your Workflow!

COOL UNDER PRESSURE - Innovative finned design dissipates heat efficiently, enabling longer, uninterrupted welding sessions.
LIGHTWEIGHT PORTABLE - At just 9.6 ounces, this clamp travels with you—perfect for on-site pros who demand mobility.
CLEAN READY IN SECONDS - Switch off magnetism to easily remove metal shavings and maintain peak conductivity.
EFFORTLESS MAGNETIC GRIP - 200 lb breakaway force secures your ground instantly on pipes and plates—no clamps, no hassle.
POWER PACKED PERFORMANCE - Supports a robust 300 Amp current with instant on/off switching for seamless welding workflow.

The Magswitch 300 Amp Switchable Magnetic Welding Ground Clamp delivers a powerful 300 Amp grounding solution with a 200 lb magnetic hold on both flat and round steel surfaces. Its finned design reduces operating temperature for extended high-duty cycles, while its lightweight, portable form factor eliminates the need for traditional clamps. Ideal for professional welders seeking efficiency, reliability, and quick setup, this clamp also features an easy off-switch to clean metal debris, ensuring consistent performance on every job.

Specifications

ASIN	B00VTQBUXU
Best Sellers Rank	#56,159 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #46 in Bar Clamps
Brand Name	Magswitch
Color	Yellow
Customer Reviews	4.6 4.6 out of 5 stars (799)
Global Trade Identification Number	00878628002931
Included Components	Ground clamp, Instruction manual
Item Dimensions	2.9 x 1.9 x 2.3 inches
Item Highlight	300 Amp switchable magnetic welding ground clamp. 200 lb breakaway force for flat and round surfaces.
Item Type Name	Ground Clamp
Item Weight	9.6 ounces
Manufacturer	Magswitch Technology Inc.
Manufacturer Part Number	Ground Clamp 300AMP with FIN
Manufacturer Warranty Description	1 Year Manufacturer Warranty
Material Type	Iron
Model Number	8100746
Number of Items	1
Style Name	Heavy Duty
Tensile Strength	200 pounds
UPC	712231542593 878628002931
Unit Count	1 Count

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₩167261

Duties & taxes included

In stock

Sold byAmazon South KoreaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to South Korea.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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