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High temperature seal rings for Raytools protective window drawers: the 32.2 x 24 x 3.55 mm seal for the D27.9 x 4.1 mm lower window (Raytools 11021M2110007, BT210S, BT240S, BM109, BM110, BM111) and the 42.5 mm spring seal for the D37 x 7 mm window (11021M2110005, BM114, BM114S, BM115, BM06K, BS08K).
The seal holds the protective window flat 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.
Replace the seal whenever it is deformed or discoloured, and keep spares with your protective windows. 1 pack, 5 pack and 10 pack.
| Material | High temperature elastomer / spring seal |
| Sizes | 32.2 x 24 x 3.55 mm, 42.5 x 4 x 3.2 mm (spring seal) |
| Fits | Raytools protective window drawers for 27.9 x 4.1 and 37 x 7 mm windows |
| Pack Options | 1 pack, 5 pack, 10 pack |
| Part Number | Dimensions | Raytools Part No.(SPM Part No.) | Fits |
|---|---|---|---|
| 32.2 x 24 x 3.55 mm, for 27.9 x 4.1 window | 32.2 x 24 x 3.55 mm | 11021M2110007(SPM-LAS-2116-322X24X355FOR2) | BT210S, BT240S, BM109, BM110, BM111 |
| 42.5 x 4 x 3.2 mm, for 37 x 7 window | 42.5 x 4 x 3.2 mm (spring seal) | 11021M2110005(SPM-LAS-2116-425X4X32FOR37X) | BM114, BM114S, BM115, BM06K, BS08K |
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 |
|---|---|---|
| LaserThings | USD 15.78 | 5 Oct 2026 |
| SS Laser Solutions (GBP 25 ex VAT) | USD 31.75 | 8 Oct 2026 |
| Spare Part Mart | USD 12.77 | Today |
Our price of USD 12.77 is 19% 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.
Match the protective window size in your drawer: 27.9 x 4.1 mm windows take the 32.2 x 24 x 3.55 mm seal, 37 x 7 mm windows take the 42.5 mm spring seal.
No. They are aftermarket seals made to the same dimensions. Raytools part numbers are listed so you can match the seal you are replacing.
When they are flattened, hardened, cracked or heat discoloured. Many shops change the seal every few window changes.
Yes. Shipping options and costs for your country are shown at checkout.
Prices depend on your ZIP or postcode.
Live rates for the quantity selected, delivered to your door. Confirmed at checkout.
