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1/4" x 32 UNEF

cloudythoughts

By cloudythoughts
in DIY Astronomer

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cloudythoughts

cloudythoughts

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Does anyone know where I might find a 1/4" x 32 UNEF screw?

As far as I can tell this is the size of the tripod mounting hole in my 10 x 50 Tento binoculars. I've tried the local shops and spent a fair amount of time searching the web but coming up with nothing.

I only need one, but realise I'll need to meet an MOQ or MOV.

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AndyH

AndyH

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You know, Gina, as I was typing, I was questioning myself

!!

Whitworth it is.

I thought there had been a discusion about this recently....

http://stargazerslounge.com/diy-astronomer/163228-1-4-whitworth-camera-bolt.html

UNC(UNC=Unified Course. Not UNF, which is the fine thread) is virtually exactly the same as Whit. So use whatever you can source, I reckon.

Andy.

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perkil8r

perkil8r

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1/4 UNF and 1/4 Whitworth are different. UNF is 32 tpi, whilst whitworth (BSW) is 20, the same as UNC, but UNC and BSW have a very slightly different depth but do intergrate fairly well. If you are struggling I will ask next time I speak to my supplier, I use UNF all the time, but not normally as small as 1/4. 5/16 is the smallest I have here, but should be able to get a few 1/4 UNF if you're struggling.

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cloudythoughts

cloudythoughts

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1/4 UNF and 1/4 Whitworth are different. UNF is 32 tpi, whilst whitworth (BSW) is 20, the same as UNC, but UNC and BSW have a very slightly different depth but do intergrate fairly well. If you are struggling I will ask next time I speak to my supplier, I use UNF all the time, but not normally as small as 1/4. 5/16 is the smallest I have here, but should be able to get a few 1/4 UNF if you're struggling.

Thank you for looking. I do need UNEF, not UNF though (32 TPI not 28 TPI)

For comparison : 1/4 UNC is 20 TPI, 1/4 UNF is 28 TPI and 1/4 UNEF is 32 TPI.

Actually I have not proven the thread size yet. I know that 1/4 UNC does not fit, and I bought a 1/4 UNF yesterday and that does not fit, and I tried an M6 at work and that does not fit. The stud that came out had about four threads in about 3mm - I calculate that to be 33.9 TPI, but my measurement was by eye against a steel rule, so allowing for error it could easily be 32 TPI. I don't know how better to be certain without actually trying the UNEF.

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cloudythoughts

cloudythoughts

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I have a specialist engineering supplies shop (Swansea Fasteners) thats on my way home from work I will call in tomorrow and see what they say...

Peter...

Thank you ever so much.

I've tried all the local shops here and although they've been very helpful it's taken has take one or two attempts for them to realise what I'm asking for. I getting the impression that UNEF is very unusual.

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AndyH

AndyH

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Thank you ever so much.

I've tried all the local shops here and although they've been very helpful it's taken has take one or two attempts for them to realise what I'm asking for. I getting the impression that UNEF is very unusual.

Very !!

I had to look it up on the web. It has no mention in the couple of engineering booklets I have.

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Psychobilly

Psychobilly

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I popped over in my lunch hour...

Well at least they new what it was .. but didnt have anythign in stock... The guy disappered wiht the thread guages and vernier and had a rummage in the odds box...

MOQ would be 25 bolts and the price... would need the lenght first... But probably not going to be cheap...

Peter...

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cloudythoughts

cloudythoughts

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Hi

Try modelfixings.co.uk they might have them

Have already tried - they didn't but have promised to look in to it - not heard back from them yet.

My appologies, I was looking at UNEF not UNF, that said, my supplier also supplies Rolls Royce, and they still use a lot of very odball sizes so they may well have something knocking about. As I say, let me know.

No apology needed. Having tried so many places now and keep getting offered UNF or even UNC I'm getting rather twitchy.

Eurofasteners in Weymouth have a massive range of different threads and sizes.....might be worth calling them.

I'll add them to my list. Nothing on their web pages, but it's probably best to call.

Very !!

I had to look it up on the web. It has no mention in the couple of engineering booklets I have.

And that's what making me wonder if it really is UNEF or 32 TPI.

Does anyone know the right way to measure this without a thread gauge?

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cloudythoughts

cloudythoughts

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I popped over in my lunch hour...

Well at least they new what it was .. but didnt have anythign in stock... The guy disappered wiht the thread guages and vernier and had a rummage in the odds box...

MOQ would be 25 bolts and the price... would need the lenght first... But probably not going to be cheap...

Peter...

Thank you.

I'm not too worried about cost, but there has to come a point where it would be better to invest the time and money in a new pair of binocular with the right mounting point.

My original plan was a 40mm bolt to fit my existing bracket (with a little bit of padding). But I anything down to about 10mm I could make work I think, and a box of 12 would would be cheaper to post if shorter.

I think I need to confirm the thread. I'm uncomfortable that UNEF is so rare and I'm only assuming it's UNEF from a very crude measurement I did with a steel rule by eye.

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steelfixer

steelfixer

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If you want to test the thread it is the same as an old toggle switch.

It must be an old old one though as the new ones are metric.

If you rearly get stuck you can soon make one as the dies are readily available.

If this is not possible for you to do let me know and I will make one for you.

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AndyH

AndyH

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I'm holding my head close to my pc monitor, so you have easy access to slap me through the screen.....

It wouldn't be M6 fine(M6 x 0.75, compared with the std/coarse M6 x 1.00) would it??

Basically a metric version of the UNEF? Converted to TPI, it would be 33.87.

My Russian Tal 200K has six primary collimation setscrews that use this size.

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