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Small cylindrical metal cap with threaded base and knurled sides

Miller - Weldcraft

Miller - Weldcraft 57Y02 Long Back Cap for Series 17 18 26

SKU CH-H5KG-7NHJ6

Long back cap fits Series 17, 18 and 26 TIG torches, securing the electrode on compatible WP, PTA and PTW models

  • TypeTools
  • Long back cap extends torch reach for tight joints
  • Compatible with Series 17 18 26 torches for broad fit
  • Fits models 17F 17V 18HP 26FV and more
  • New condition ensures reliable thread engagement and seal
  • California Proposition 65 warning for cancer and reproductive harm

Miller Weldcraft 57Y02 Long Back Cap

The Miller Weldcraft 57Y02 is a long back cap designed for TIG welding torches in the Series 17, 18 and 26 families. It fits a wide range of models including WP, PTA, PTW, WP-R, CS, A and W series torches. This replacement part secures the collet body and helps maintain consistent shielding gas coverage during welding operations.

For TIG welders using compatible Miller torches

Welders who own Series 17, 18 or 26 torches and need a long back cap will find this part matches their equipment. It is not suited for operators using torch series outside the listed compatibility range, such as smaller micro torches or larger water-cooled models not shown in the fitment list. Buyers who need a short or medium back cap should look for a different size designation.

The critical specification is the long size

This back cap carries the long size designation, which determines the internal volume available for collet and gas lens combinations. Selecting the correct length ensures proper electrode stick-out and gas flow dynamics for the specific joint configuration. Verify the torch model against the extensive compatibility list before ordering.

Highlights

  • Long back cap extends torch reach for tight joints
  • Compatible with Series 17 18 26 torches for broad fit
  • Fits models 17F 17V 18HP 26FV and more
  • New condition ensures reliable thread engagement and seal
  • California Proposition 65 warning for cancer and reproductive harm

Specifications

BrandMILLER ELECTRIC
TypeTools

Questions about this item

How do I install the 57Y02 long back cap on my Series 17 torch and what step is often missed?

Thread the cap onto the torch body by hand until snug, then tighten slightly with a wrench; the step many miss is ensuring the O-ring seats evenly before final tightening.

What maintenance or replacement will the 57Y02 back cap need over time?

Inspect the O-ring for cracking or flattening after extended heat cycles; replace the cap if threads show galling or the seal no longer holds gas pressure.

What limit appears first on the 57Y02 back cap during sustained high-amperage welding?

The O-ring degrades fastest under continuous heat, losing elasticity and causing gas leaks before the metal body shows wear.

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