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Aftermarket bottom protective glass for Bystronic fiber laser cutting heads. Replaces Bystronic 10045746 (Glass ARQ1064.50.36).
This is the lower window under the focusing lens, the one that faces the cut. The same 36 x 5 mm glass is used in II-VI HIGHYAG BIMO cutting heads.
D36 x 5 mm fused silica, anti reflection coated on both faces for 1064 nm. Sold in packs of 1, 5 or 10.
| Replaces | Bystronic 10045746 |
| Size | D36 x 5 mm |
| Material | Fused silica, AR coated both faces |
| Wavelength | 1064 nm fiber lasers |
| Also Listed As | Glass ARQ1064.50.36 |
| Pack Options | 1 pack, 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.) |
|---|---|---|
| D36 x 5 mm | D36 x 5 mm | 10045746(SPM-LAS-2165) |
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
Single windows for an urgent change, 5 packs for a machine running one shift, 10 packs at the lowest price per piece for busy production lines.
Found this part cheaper elsewhere? Send us the listing and we will beat it under our Price Beat Guarantee. Every order is also covered by our 30 day money back guarantee.
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.
Orders typically require 1–3 business days for processing. During this time, we confirm product availability and prepare the shipment for consolidation.
We offer two shipping tiers designed to meet your operational needs. The exact costs for all shipping options will be displayed at checkout.
Express Shipping (UPS, DHL, etc.)
Ideal for urgent needs. Estimated delivery time is typically 3–5 business days after processing.
Economy Shipping
Our standard, cost-effective option. Estimated delivery time is typically 5–10 business days after processing.
Shipping costs are calculated at checkout based on your location and selected shipping method.
Once your order ships, you'll receive a tracking number via email so you can monitor your delivery.
For detailed delivery information and FAQs, please visit our Delivery Information page or contact us.

