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04-18-2020, 09:21 PM   #1
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Help, screw type for DA lens, broken screw

Hi Guys,

I broken few screw (stripped screw) when trying to open a Pentax DA lens.
does anyone know the type of the screw so that I can buy some replacement one?

I guess the screws are of the same type for most DA lens. so is it metric or imperial ? what size ?

Thanks!

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04-18-2020, 11:00 PM   #2
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These screws are Japanese (JIS) screws so I'm pretty sure they are metric. I have seen bags of camera screws on ebay.
04-19-2020, 12:10 AM - 2 Likes   #3
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If it were an Asahi lens I would guess like M1.7 3 or M1.7 2 pan head screws. M indicates metric. I don't know if the contemporary lenses are still using 1.7mm diameter screws but back in the MF film days 90% of the screws on the lenses and bodies were M1.7. If you have a digital caliper measure the shaft diameter and do a web search on (for example) "M1.7 x 3 machine screws" and several sources should show up.

Get yourself set of JIS drivers (not Philips drivers) and you likely won't be stripping the heads any longer.
04-19-2020, 04:48 AM   #4
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It is metric. looking at the screw, put a drop of blue or even red locktite on it and screw it back in wiping of any excess then let it set up and you should be good for a long while.

04-19-2020, 03:49 PM   #5
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@Jie, I've sent you a private message. Depending on your location, I might be able to post some mount screws to you.
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