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Small metal back cap for TIG torch, short style, pack of two

American Torch Tip Company

American Torch Tip Company 57Y04 Back Cap Linde PK2

SKU CH-7BFN-P1BXA

Short back cap fits TIG torch series 17, 18 and 26 for secure electrode retention

  • TypeTools
  • Short back cap fits Series 17, 18, 26 torches
  • Compatible with WP-17, WP-18, WP-26 models
  • Works with PTA-17, PTA-26, PTW-18 series
  • Fits A-150, A-200, A-250 power supplies
  • Suits W-350, W-400, W-410 water-cooled torches

Compatible Torch Models

The American Torch Tip 57Y04 back cap fits a wide range of TIG torches including models 17, 18 and 26 along with their flex, valve and high-power variants. It also matches PTA, PTW and WP series torches as well as W-series water-cooled units. The short size designation keeps the torch head compact for tight joint access.

Durable Thread Engagement

Precision machined threads maintain a secure seal on the torch head during extended welding cycles. The cap resists loosening from vibration and thermal cycling so shielding gas coverage stays consistent. Build quality supports repeated removal and reinstallation for consumable changes without thread damage.

Short Back Cap Constraint

The short profile limits internal collet and collet body length to the standard short-series dimensions used on 17, 18 and 26 style torches. It will not accept long or stubby collet bodies designed for other cap lengths. Welders needing extended reach or gas-lens bodies must use the matching long or medium cap instead.

Highlights

  • Short back cap fits Series 17, 18, 26 torches
  • Compatible with WP-17, WP-18, WP-26 models
  • Works with PTA-17, PTA-26, PTW-18 series
  • Fits A-150, A-200, A-250 power supplies
  • Suits W-350, W-400, W-410 water-cooled torches

Specifications

BrandAMERICAN TORCH TIP
TypeTools

Questions about this item

Does this back cap run hot or draw extra power when the torch is used all day?

The back cap is a passive mechanical part; it generates no heat and draws no power during extended welding sessions.

Which torch models must I already own for this 57Y04 back cap to fit?

It fits Series 17, 18 and 26 torches including WP-17, WP-18, WP-26 and their F, FV, V, HP and P variants.

Will this short back cap work with the older WP-17 and WP-26 torches I already have?

Yes, it is compatible with WP-17, WP-17V, WP-26, WP-26V and the earlier WP-R17F, WP-R26F models.

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