20 x 3mm Fibre Laser Protective Window — 6kW Handheld Welding, WSX, Raytools & Ospri Fit
Rated to 6kW — genuine fused silica, not soda-lime glass. This 20 x 3mm protective window (also written D20x3, D20*3 or D20T3) is built for high-power handheld fibre laser welding. The extra 3mm thickness handles higher heat loads, and its dual-sided anti-reflective coating protects your focusing optics and keeps weld quality consistent shift after shift. Also known as a protective lens, protection lens or cover slide.
Specifications
- Diameter: 20mm
- Thickness: 3mm
- Size notations: 20x3, 20*3, D20x3, D20*3, D20T3, FS20x3
- Material: Fused silica (quartz)
- Power rating: Up to 6kW
- Coating: Dual-sided anti-reflective for 1064nm fibre laser wavelength
Compatible handheld & welding heads
- Raytools handheld laser welding heads
- Ospri handheld laser welding heads
- WSX D20T3 handheld welding heads
- Handheld fibre laser welding heads that take a 20 x 3mm protective window
Compatible machine brands
- Bodor, HSG, DNE, Han's, G. Weike and Quick handheld laser welders
Note: this is a 3mm thick window — check your current window before ordering, as some heads take the thinner 20 x 2 or the 18 x 2. Not sure if it fits your head? Send us your machine or head model and we'll confirm before you buy. Shipped fast Australia-wide from our Brisbane workshop.

