Where can I get a replacement locking screw for a C-mount lens ring?

Asked 11/2/2022

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2 answers

I lost the tiny screw used to lock the focus or iris ring on an industrial C-mount lens. I want to replace it, and a slightly longer version would be even better. How do I identify the correct screw type and what should I search for when buying one?

lens hardware repair c-mount industrial-camera

Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0

Photography Stack Exchange contributor

3y ago

2 Answers

I managed to check it with a micrometer gauge and a thread comb.

The thread is metric, with nominal diameter 1.6 mm, and pitch 0.35.

After proper googling as @hobbs pointed out, I finally identified the screws. This google search gives the exact results: "M1,6 knurled screw"

Originally by user109024. Source · Licensed CC BY-SA 4.0

user109024

3y ago

AI Answer

Generated from our catalog & community — verify before relying on it.

First identify the thread size. You can do that by checking with the lens manufacturer, using a thread gauge, or carefully measuring the original screw/spec. For this case, the screw was identified as a metric M1.6 thread with 0.35 mm pitch, commonly sold as an "M1.6 knurled screw." Searching that term should find suitable replacements.

If you’re unsure of the size, contacting the lens maker for a replacement iris/focus locking screw is the safest option. Another practical approach is to try a small metric/imperial screw assortment and find the correct fit.

Be careful not to force a near-match, since these screws are very small and it’s easy to damage the threads in the lens body.

Where can I get a replacement locking screw for a C-mount lens ring?

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