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Aftermarket collimating lens for Qilin and WSX handheld welding guns: 20 mm diameter, 3.5 mm centre thickness (CT), 50 mm focal length.
The collimating lens sits behind the fiber connector and turns the diverging beam from the fiber into a parallel one. A damaged collimator costs power on every weld.
S1 grade fused silica, anti reflection coated on both faces for 1064 nm. Sold singly or in packs of 5. Sold in packs of 5.
| Pack Size | 5 pieces per pack |
| Type | Collimating lens |
| Diameter | 20 mm |
| Centre Thickness | 3.5 mm |
| Focal Length | 50 mm |
| Material | S1 grade fused silica, AR coated both faces |
| Wavelength | 1064 nm fiber lasers |
| Fits | Qilin and WSX handheld welding guns |
| Pack Options | 5 pack |
Handheld welding guns
Check the size against the part you are replacing.
| Lens | Specification | Fits | SPM Part Number(OEM no. where one exists) |
|---|---|---|---|
| Qilin / WSX collimating D20 x 3.5 F50 | D20 mm, CT 3.5 mm, F50 | Qilin handheld, WSX handheld | SPM-LAS-2192 |
| Lens | Fits |
|---|---|
| SUP focusing D20 x 4.5 F150 | SUP20S, SUP20T, SUP21T, SUP23S, SUP23T, SW150 |
| SUP focusing D20 x 4.5 F200 | SUP20S, SUP20T, SUP21T, SUP23S, SUP23T, SW150 |
| SUP collimating D20 x 5 F60 | SUP20S, SUP20T, SUP21C |
| SUP collimating D16 x 5 F60 | SUP21T, SUP23S, SUP23T, SW150, SUP22C |
| Qilin / WSX focusing D20 x 3 F150 | Qilin handheld, WSX handheld |
| Qilin / WSX focusing D20 x 3 F120 | Qilin handheld, WSX handheld |
| Relfar / Raytools BW101 focusing D20 x 4.75 F150 | Relfar handheld, Raytools BW101 |
Collimator damage
A burned collimating lens costs power on every weld. Check it when the focusing and protective lenses are clean and power is still low.
Keeping spares
Lenses are cheap next to downtime. The 5 pack keeps a spare for every gun in the shop.
We check what other aftermarket sellers charge for this same part. Their prices on the date we checked:
| Seller | Price | Checked |
|---|---|---|
| Startnow (5 singles) | USD 26.00 | 8 Oct 2026 |
| eBay, aftermarket seller (5 singles) | USD 72.90 | 5 Oct 2026 |
| Spare Part Mart (pack of 5) | USD 18.72 | Today |
Our price of USD 18.72 is 28% to 74% 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.
It fits Qilin and WSX handheld welding guns. Match the old lens or its box: D20, CT 3.5, F50. Focusing and collimating lenses are not interchangeable.
No. They are aftermarket lenses made to the same dimensions. The gun names are given so you can match your lens.
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.
