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Tweco copper ground clamp with insulated spring handle, 300 A capacity

Tweco

Tweco 358-9205-1130 Welding Ground Clamp 300 A

SKU CH-R9HM-PPPPX MPN 358-9205-1130

Ground clamp rated 300 A with 1 1/2 in jaw opening, copper body and insulated spring handle

  • MaterialHAWA
  • TypeArc Flash Protection
  • Reliable grounding for up to 300 A welding current
  • Copper body and alloy jaws deliver strong conductivity
  • Insulated spring handle protects operator during use
  • Wide 1 1/2 in jaw opening fits thick plates
  • Ball-point screw secures cable up to 3/0 AWG

Tweco 300 A Ground Clamp

The Tweco 358-9205-1130 is a welding ground clamp rated for 300 A maximum current. It suits welders who need a reliable earth connection on flat plates during arc processes. The copper body and copper alloy clamp connection conduct current efficiently. The insulated spring adds operator protection while the handle stays cool.

Thermal and Electrical Performance

Copper construction keeps resistance low so the clamp runs cooler under continuous 300 A loads. The insulated spring reduces heat transfer to the operator's hand during long seams. No moving fan or active cooling is present; the mass of the copper body dissipates heat passively. Power draw depends entirely on the welding machine settings.

Build Quality and Daily Use

The clamp body and handle are copper with a steel ball-point screw for cable attachment. Maximum jaw opening is 1 1/2 in and throat depth is 4 in, allowing a firm bite on thick flat plates. Overall length is 8.5 in for good leverage. The screw secures cable up to 3/0 AWG. Buyers needing a larger jaw opening or a different cable termination style should look elsewhere.

Highlights

  • Reliable grounding for up to 300 A welding current
  • Copper body and alloy jaws deliver strong conductivity
  • Insulated spring handle protects operator during use
  • Wide 1 1/2 in jaw opening fits thick plates
  • Ball-point screw secures cable up to 3/0 AWG

Specifications

BrandTWECO
Model358-9205-1130
MaterialHAWA
TypeArc Flash Protection

Questions about this item

How do I attach the cable to the ball-point screw without loosening the connection?

Strip the cable to fit 3/0 AWG maximum, insert it into the ball-point screw terminal, and tighten the steel screw firmly while holding the copper clamp body steady to prevent the cable from twisting loose.

Which parts of the Tweco 358-9205-1130 will wear out first and need replacement?

The insulated spring and copper-alloy jaw faces wear from repeated clamping on flat plates; the steel screw threads can strip if over-torqued, so inspect both after heavy use and replace the spring or screw when tension drops.

At what amperage does the clamp overheat during a long arc weld?

The 300 A rating is the continuous limit; sustained arc welding at or above this current will cause the copper body and copper-alloy jaws to heat up first, signalling the thermal limit.

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