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Aftermarket protective glass for Bystronic fiber laser cutting heads. Replaces Bystronic 10071591 (fused silica, 34 x 3 mm), also listed as 10086368.
Bystronic sells the same size in two materials. This is the fused silica window. Heads running higher power use the sapphire version, Bystronic 10145862, so check which one you are replacing.
D34 x 3 mm fused silica, anti reflection coated on both faces for 900 to 1080 nm. Sold in packs of 5 or 10.
| Replaces | Bystronic 10086368, 10071591 |
| Size | D34 x 3 mm |
| Power Rating | Fused silica version. Bystronic's sapphire window 10145862 is the same size for higher power heads; this is not the sapphire window. |
| Material | Fused silica, AR coated both faces |
| Wavelength | 1064 nm fiber lasers |
| Pack Options | 5 pack, 10 pack |
Bystronic heads
No complete head list is published for this size. Match the size and part number of the window you are replacing.
| Pack | Dimensions | Bystronic Part No.(SPM Part No.) |
|---|---|---|
| D34 x 3 mm | D34 x 3 mm | 10086368(SPM-LAS-2164) |
| D34 x 3 mm | D34 x 3 mm | 10071591(SPM-LAS-2164) |
Routine window changes
The protective window is the most frequently replaced optic in a cutting head. Change it at the first sign of spatter, pitting or a burn mark. A contaminated window absorbs laser power, heats up and can crack.
Protecting the focusing lens
The window sits between the focusing lens and the cut. Keeping it clean protects a lens that costs many times more and keeps the focal spot and cut width consistent.
Recovering lost cutting power
If piercing slows, the kerf widens or the machine needs more power for the same plate, inspect the window before changing parameters. A dirty window is the most common cause.
Stocking for every head in the shop
5 packs for a machine running one shift, 10 packs at the lowest price per piece for busy production lines.
We check what other aftermarket sellers charge for this same part. Their prices on the date we checked:
| Seller | Price | Checked |
|---|---|---|
| Laser Consumables (5 singles) | USD 29.10 | 6 Oct 2026 |
| Cloudray (5 singles) | USD 30.00 | 6 Oct 2026 |
| Quality Laser Supply (5 singles) | USD 100.00 | 6 Oct 2026 |
| eBay, aftermarket seller (5 singles) | USD 158.45 | 8 Oct 2026 |
| Spare Part Mart (pack of 5) | USD 21.55 | Today |
Our price of USD 21.55 is 26% to 86% 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.
No. It is the fused silica window, Bystronic 10086368. The sapphire window for higher power heads is 10145862.
Check the part number on the old window's packaging or in your parts list, or measure the diameter and thickness of the window you are replacing. Both must match the size shown.
No. It is an aftermarket window made to the same size. The OEM part number is shown so you can match the window you are replacing.
It is the same window in each. The 10 pack has the lowest price per window and suits machines that change windows every shift.
Hold it by the edge with clean gloves and keep it in its case until fitting. Clean only with lens tissue and optical grade alcohol.
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.
