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Aftermarket 20 x 4 mm protective lens for Hanwei handheld welding guns. The protective lens is the flat window at the front of the gun, between the focusing lens and the weld. It takes the spatter and fume, so it is the part you change most often.
Fused silica, anti reflection coated on both faces for 1064 nm. 20 mm across and 4 mm thick. Sold in packs of 10, 20 or 50, with the 50 pack the cheapest per lens.
The matching seal ring is 22 x 16 x 2.9 mm, sold separately.
| Size | D20 x 4 mm |
| Material | Fused silica (quartz), AR coated both faces |
| Wavelength | 1064 nm fiber lasers |
| Fits | Hanwei handheld welding guns |
| Matching Seal Ring | 22 x 16 x 2.9 mm |
| Pack Options | 10, 20 or 50 lenses |
Handheld welding guns
Check the size against the part you are replacing.
| Size | Specification | Fits | SPM Part Number(OEM no. where one exists) |
|---|---|---|---|
| 20 x 4 mm, Hanwei | D20 x 4 mm | Hanwei handheld | SPM-LAS-2180 |
| Size | Fits |
|---|---|
| 18 x 2 mm, SUP / WSX | SUP20S, SUP20T, SUP21T, SUP23S, SUP23T, SW150, WSX handheld |
| 20 x 2 mm, Qilin | Qilin handheld |
| 20 x 3 mm, Ospri / Relfar | Ospri handheld, Relfar handheld |
Daily lens changes
A handheld gun throws spatter straight back at the protective lens. Change it at the first dark spot or burn mark; a dirty lens absorbs power, gets hot and cracks.
Protecting the focusing lens
The protective lens is a few cents. The focusing lens behind it costs many times more. A clean protective lens keeps it clean.
Weak or uneven welds
If penetration drops or the weld bead goes uneven at the same settings, check the protective lens before changing power or speed.
Stocking a workshop
Shops running several guns go through lenses fast. The 50 pack keeps every gun supplied at the lowest price per lens.
We check what other aftermarket sellers charge for this same part. Their prices on the date we checked:
| Seller | Price | Checked |
|---|---|---|
| Cloudray (10 singles) | USD 20.00 | 6 Oct 2026 |
| Spare Part Mart (pack of 10) | USD 7.40 | Today |
Our price of USD 7.40 is approximately 63% 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 Hanwei handheld welding guns. Check the lens in your gun: it should be 20 mm across and 4 mm thick.
No. They are aftermarket fused silica lenses made to the same 20 x 4 mm size. The gun names are given so you can find the right 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.
