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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Magswitch 300 Amp Switchable Magnetic Welding Ground Clamp

Magswitch 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 Power

🔥Finned Cooling Design

🧲200 lb Magnetic Hold

€ 121.04

Duties & taxes included

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Description

🧲 Power Your Welds with Magnetic Precision — Don’t Get Left in the Sparks!

COOL UNDER PRESSURE - Innovative finned design dissipates heat for longer, uninterrupted welding sessions.
LIGHTWEIGHT PORTABLE - At under 10 ounces, take professional-grade grounding anywhere your job demands.
UNMATCHED MAGNETIC GRIP - 200 lb breakaway force secures your work on flat or round steel surfaces flawlessly.
CLEAN READY IN SECONDS - Switch off magnetism to easily remove metal shavings and maintain peak performance.
EFFORTLESS INSTANT GROUNDING - Switch on 300 Amps of reliable power in a snap—no clamps, no hassle.

The Magswitch 300 Amp Switchable Magnetic Welding Ground Clamp delivers instant, clamp-free grounding with a powerful 200 lb magnetic hold on both flat and round steel. Its finned design reduces heat buildup for extended use, while its lightweight, portable form factor ensures easy handling on any job site. Ideal for professionals seeking efficiency and reliability, it also features a switch-off function for quick cleaning and maintenance.

Specifications

ASIN	B00VTQBUXU
Best Sellers Rank	#51,096 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #50 in Bar Clamps
Brand	Magswitch
Brand Name	Magswitch
Color	Yellow
Customer Reviews	4.6 out of 5 stars 799 Reviews
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
Item dimensions L x W x H	2.9 x 1.9 x 2.3 inches
Manufacturer	Magswitch Technology Inc.
Manufacturer Part Number	Ground Clamp 300AMP with FIN
Manufacturer Warranty Description	1 Year Manufacturer Warranty
Material	Iron
Material Type	Iron
Model Number	8100746
Number of Items	1
Style	Heavy Duty
Style Name	Heavy Duty
Tensile Strength	200 pounds
UPC	712231542593 878628002931
Unit Count	1 Count

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