Raycus Replacement QBH Output Protective Window, D12.8 x H17 mm, Gold, 0.75 mm Pitch Thread

Replacement protective window cap for the QBH output head of Raycus fiber laser sources. It screws onto the end of the output head and seals the fibre end face behind a coated quartz window, so dust and back reflections hit a cheap window instead of the fibre.

This one is the gold D12.8 x H17 mm cap: straight body, 0.75 mm pitch inner thread, 12.8 mm across and 17 mm high. Raycus uses several window caps of different heights and finishes on different sources and power levels, so measure the cap you are replacing (diameter and height) and compare it with the photo before ordering.

Sold singly. It is a replacement part, not an original from the laser maker.

Technical properties & sizes

Applications & use cases

Burnt or pitted window
The window is the last optic before the beam leaves the source. A speck of dust or a back reflection burns a spot into it, power drops and the spot grows. Swap the cap as soon as you see a mark, before it damages the fibre end.

Every time the fibre is unplugged
Fit a clean cap whenever the output head comes out of the cutting or welding head; a cap that has been left open on the bench should be replaced, not wiped.

Keeping a spare
A spare cap in the drawer turns a burnt window into a five minute job instead of days of downtime.

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Frequently asked questions