Misc. Lenses FAQs
Answers to common questions about replacement cover lenses and protective plates for welding helmets and auto-darkening filters.
What is the difference between an inner and an outer cover lens?
The outer (front) cover lens sits in front of the welding filter and takes the sparks, spatter and grinding debris so the filter behind it does not have to. The inner cover lens sits on the wearer's side of the filter and is replaced if it becomes damaged, for example cracked or pitted.
Both are clear, replaceable parts. Many helmets use both, some use only an outer lens, so check the manual for which positions your helmet has.
When should I replace a cover lens?
Helmet manuals generally say to replace a cover lens when it is cracked, scratched or pitted. A damaged lens scatters light, makes the weld pool harder to see and can tempt you to lean in closer to see what you are doing.
How often this happens depends on the work: heavy spatter and grinding wear lenses quickly, clean TIG work much more slowly. Replace a cracked lens straight away, as it is no longer protecting the filter. Makers give no single interval, so judge by condition.
Why must I use a cover lens at all?
The welding filter is the part that protects your eyes from the arc, and it can be damaged by spatter, sparks and grinding debris. A cover lens takes that wear, so the filter stays clear and works as designed for longer. Makers describe cover lenses as sacrificial parts that protect the more delicate filter behind them.
Running a helmet without its cover lens, or with a badly pitted one, risks damage to the filter and a poorer view of the work. Treat it as a consumable rather than an optional extra.
How do I know which cover lens fits my helmet?
Cover lenses are usually made for a particular helmet or filter series, and makers list which helmets each lens suits, so a lens that looks close can still sit loosely or leave a gap. Start with the helmet maker's manual or parts list, which names the correct lens for each position, and check the helmet or filter label for the model.
If you cannot identify it, measure the old lens (length and width, and whether it is rectangular or round) and note the shape of any cut-outs or notches. Our team can help you match it if you are unsure.