Thread lensscrew?

[Lizzie]

Anyone know what thread used on the small screws part number C33952-F?

[Craig Balzer]

They are an unusual screw/bolt available at Barratt's
They are very pound of them

I doubt you'd find a local substitute locally

https://www.sngbarratt.com/English(US)/ ... Down=false

[MarekH]

It's not proprietary. It'll be something like 6BA or the relevant UNF size. I have a shop near me that specialises in things like these but I'm not passing that way again until next Wednesday.

kind regards
Marek

[Lizzie]

The problem is not the screw itself, but the threads in the housing. I need to refresh one of them and I don’t think they are UNF.

[abowie]

3/16" (8) UNF is my guess. 36tpi.

If it's 32tpi it's UNC.

If you have a screw measure the diameter and tpi.

That will tell you.

[mgcjag]

Have a read here viewtopic.php?f=3&t=19497&p=158974&hili ... ad#p158974

[Gfhug]

Lizzie, if you’re happy using stainless screws then you can easily use one as a thread cleaner. With a needle file cut a small V along the length of the thread. This gives it a cutting action and will help clean the hole threads.
A method of cleaning all threads if you haven’t got the correct taps or dies. Take a stainless nut (as they give a sharper cut) file a V or two Vs into the thread and you can clean up bolts quite easily, too.
Geoff

[Gfhug]

The screws are 6-32 unc. If you don’t mind them being modern replacements that may not have the correct pozi or Philips head of the originals then they are readily available on eBay, etc.

Geoff

[MarekH]

3/16" (8) UNF is my guess. 36tpi.

If it's 32tpi it's UNC.

If you have a screw measure the diameter and tpi.

That will tell you.

I tried a 6/32" UNC on a spare housing and it wound in perfectly. Use 3/4" length

kind regards
Marek

EDIT:- posted at the same time as Gfhug - how weird

[Lizzie]

Thanks out there for all suggestions.

I will try 6/32" UNC

Best regards
/Anders