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Aftermarket focusing lens for Qilin and WSX handheld welding guns: 20 mm diameter, 3 mm centre thickness (CT), 120 mm focal length.
The focusing lens brings the parallel beam from the collimator to the welding spot at the nozzle. A burned or pitted focusing lens shows up as weak penetration and a wide, uneven bead at normal settings. F120 gives a smaller spot and a shorter working distance than the F150.
S1 grade fused silica, anti reflection coated on both faces for 1064 nm. Sold singly or in packs of 5.
| Type | Focusing lens |
| Diameter | 20 mm |
| Centre Thickness | 3 mm |
| Focal Length | 120 mm |
| Material | S1 grade fused silica, AR coated both faces |
| Wavelength | 1064 nm fiber lasers |
| Fits | Qilin and WSX handheld welding guns |
| Pack Options | 1 or 5 lenses |
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 focusing D20 x 3 F120 | D20 mm, CT 3 mm, F120 | Qilin handheld, WSX handheld | SPM-LAS-2191 |
| 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 collimating D20 x 3.5 F50 | Qilin handheld, WSX handheld |
| Relfar / Raytools BW101 focusing D20 x 4.75 F150 | Relfar handheld, Raytools BW101 |
Burned focusing lens
Spatter that gets past a dirty protective lens burns the focusing lens. Weak penetration and a wide, uneven bead at normal settings are the signs.
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 | USD 5.20 | 8 Oct 2026 |
| Spare Part Mart | USD 4.16 | Today |
Our price of USD 4.16 is approximately 20% less than this seller.
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, F120. 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 postcode.
In USD for the quantity selected. The exact cost is confirmed at checkout.
