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Weldcraft 57Y03 is the medium, about 60 mm TIG back cap for WP17, WP18 and WP26 series TIG torches. This is an aftermarket part made to the same number and fit.
The back cap screws into the rear of the torch head and presses the collet closed on the tungsten. Its length sets how much tungsten you can leave in the torch: the long cap takes a full length electrode, the short one fits tight spaces.
Check the number on the packet of your old parts or in the torch parts list before ordering: it should read 57Y03. Sold in packs of 25.
| Pack Size | 25 pieces per pack |
| Part number | 57Y03 |
| Part | TIG Back Cap |
| Size | medium, about 60 mm |
| Fits | WP17, WP18 and WP26 series TIG torches |
| Material | Heat resistant black insulating body, brass thread, O-ring seal |
| Supplied | Back cap with O-ring |
| Type | Aftermarket replacement |
| Stat. HS-Code | 851590 |
| Country of Manufacture | China |
| Trademarks | Weldcraft is a trademark of its owner. Names and part numbers are for reference only; this is an aftermarket part, not made or approved by them. |
WP17, WP18 and WP26 series TIG torches
Match the part number on your old part before ordering.
| Dimensions | Weldcraft Part No.(SPM Part No.) |
|---|---|
| medium, about 60 mm | 57Y03(SPM-WLD-4972) |
Routine replacement
Back caps crack, lose their O-ring seal or strip their thread. A leaking cap lets air into the shielding gas.
Access
Swap between long, medium and short caps to suit the joint: short caps fit tight corners, long caps take a full length tungsten.
We check what other aftermarket sellers charge for this same part. Their prices on the date we checked:
| Seller | Price | Checked |
|---|---|---|
| eBay (5 aftermarket sellers) (pack of 25) | USD 22.00 to 38.00 | 1 Nov 2026 |
| Supercheap Auto (UNIMIG) (pack of 25) | USD 49.00 | 1 Nov 2026 |
| Spare Part Mart (pack of 25) | USD 17.31 | Today |
Our price of USD 17.31 is 21% to 65% less than these sellers.
Found this part cheaper somewhere else? Send us the listing and we will beat it by 5% under our Price Beat Guarantee. Every order is also covered by our 30 day money back guarantee.
Yes, it was made for the Weldcraft WP17, and 2 more listed under compatible equipment. Check the old welding torch back cap is marked 57Y03 or one of the cross references, because makers change parts between serial ranges.
On the Weldcraft WP17, it depends on hours and working conditions. Follow the machine service schedule, and change it when it shows wear rather than waiting for it to fail.
Leaks, noise, loss of performance, or visible wear compared with a new part. If in doubt, measure it against the sizes in the specifications.
Keep it until the new one is fitted and running. It is the quickest way to compare sizes, connectors and mounting if anything looks different.
Yes. Every order is covered by our 30 day money back guarantee. Keep it unused and in its packaging.
No. It is an aftermarket welding torch back cap made to replace the Weldcraft 57Y03. It is not made by the original manufacturer; the number only shows what it replaces.
Live rates for the quantity selected, delivered to your door. Confirmed at checkout.
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