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Add lens tissue: $8.55 5% off with this part
Powder-Free Anti-Static Finger Cots for Handl...: Spring energised seal ring for the protective window drawer of fiber laser cutting heads: 36 mm outside diameter, 29.5 mm inside diameter and 3 mm high.
The PTFE jacket holds a stainless steel spring, so the ring keeps pressing the window flat and sealed through heat cycles. The seal holds the protective window in its drawer and keeps cutting fume and assist gas out of the optical cavity. A flattened, hardened or heat damaged seal lets the window shift and lets contamination reach the focusing lens.
Sold in packs of 5, all the same 36 x 29.5 x 3 mm ring. Measure the seal you are replacing: outside diameter, inside diameter and height must all match, and the upper and lower window drawers on one head often take different seals.
| Pack Size | 5 pieces per pack |
| Outside Diameter | 36 mm |
| Inside Diameter | 29.5 mm |
| Height | 3 mm |
| Material | PTFE jacket with stainless steel spring |
| Colour | White |
| Stat. HS-Code | 398190 |
| Country of Manufacture | China |
| Dimensions | OEM Part No.(SPM Part No.) |
|---|---|
| 36 x 29.5 x 3 mm | No OEM equivalent(SPM-LAS-4535) |
Window changes
Fit a fresh seal when a window change shows the old seal flattened, hardened or stuck to the window.
Keeping optics clean
A good seal stops fume and gas bypassing the window and contaminating the focusing lens.
Fixing window movement
If windows crack or sit unevenly in the drawer, replace the seal before the next window.
Spares kit
Keep seals with your protective window stock so both are changed together.
We check what other aftermarket sellers charge for this same part. Their prices on the date we checked:
| Seller | Price | Checked |
|---|---|---|
| Startnow (5 singles) | USD 43.00 | 30 Oct 2026 |
| MG Laser (5 singles) | USD 90.00 | 30 Oct 2026 |
| Spare Part Mart (pack of 5) | USD 35.95 | Today |
Our price of USD 35.95 is 16% to 60% 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.
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.
Match the part number on the old seal ring to the original part or a number in the cross reference table. If the number is worn off, compare the sizes in the specifications.
Yes. Every order is covered by our 30 day money back guarantee. Keep it unused and in its packaging.
No. It is an aftermarket seal ring made to replace the the original part. 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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Join Marty Mates and we put 200 points on your account, worth $10 off an order over $75 USD. Then a point for every dollar you spend after that.
No password: you enter your email, we send a code, and that is you in.
