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03-21-2019, 02:35 AM   #1
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Bolt size

I know this is probably a very stupid question, but can anyone tell me the specs of a bolt that would fit the standard camera tripod mount?

I've just picked up a set of bellows, I want to mount it to a flat surface using the tripod mount and to save me walking up and down the aisle in my local hardware store trying everything that looks like it might fit, I thought I would ask.

Cheers

03-21-2019, 02:41 AM - 1 Like   #2
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well reversible adapters are 3/8" to 1/4" or the reverse

Promaster 3/8" to 1/4" Tripod Thread Adapter


Sunmns 1/4 Inch and 3/8 Inch Converter Threaded Screws Adapter Mount Set for Camera/Tripod/Monopod/Ballhead/Light Stand/Shoulder Rig, 21 Pieces

does that help ?
03-21-2019, 03:08 AM - 2 Likes   #3
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1/4" by 20 threads per inch is the most common
03-21-2019, 03:36 AM   #4
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Thank you both, much obliged

03-21-2019, 06:04 AM - 1 Like   #5
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As far as I remember in the USA it is 1/4 coarse thread.
03-21-2019, 10:09 AM - 1 Like   #6
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QuoteOriginally posted by Liney Quote
I know this is probably a very stupid question, but can anyone tell me the specs of a bolt that would fit the standard camera tripod mount?

I've just picked up a set of bellows, I want to mount it to a flat surface using the tripod mount and to save me walking up and down the aisle in my local hardware store trying everything that looks like it might fit, I thought I would ask.

Cheers
1/4"x20
03-21-2019, 10:41 AM - 1 Like   #7
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It's known over here as a 1/4" Whitworth bolt. Whitworth were the first standardised thread form, in 1841. I'm pretty sure the bigger tripod screw is also Whitworth, 3/8". More recently these sizes have been re standardised as UNC threads; the same number of Threads Per Inch, (20 tpi and 16 tpi respectively) but the screw thread has 60 degree sides instead of 55 degree ones. In practise it probably makes little difference, but you may be able to find UNC bolts more easily; the bolt is only done up finger tight, after all.

If you have to order this stuff, a bolt doesn't have a thread that goes all the way to the head, a set screw does. This cork sheet looks useful for stopping things from swivelling about, though I haven't yet tried it myself. You'll have to do a search in your own country. (I see you are in Australia)

Taps and dies to clean, cut or extend threads for all these sizes are easily available for either, at least in the UK, and I find them useful for making various brackets. Don't buy the ones that are "for restoration". They are cheap for a reason.


Last edited by Robot camera; 03-21-2019 at 10:58 AM.
03-21-2019, 11:40 AM - 1 Like   #8
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That one would fit for sure:
1/4 Screw with D-Ring - for Cameras / Tripods / Photo / Video ID: 2629 - $1.95 : Adafruit Industries, Unique & fun DIY electronics and kits

Last edited by jumbleview; 03-22-2019 at 09:53 AM.
03-21-2019, 12:05 PM - 1 Like   #9
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1/4-20 ANSI...equivalent to 1/4 UNC (UTS) for the more common smaller size...

3/8-16 ANSI for the less common larger size...

Some older British-made stuff may be Whitworth, but anything recent or made for import to the U.S. would be ANSI.


Steve
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