American screw... needs help please

Hi,
I need some screws that are made to imperial size standard but do not know how to name it to look for on ebay or elswhere.

Length is with the head: 0.625" or also 0.73"
Width is 0.25 for the screw
Head is only 0.37" width and 0.125 high". Loot at the pictures.
The screw-thread is less tigth than what I found in EC...

How would you name it in USA or Great Britain please ?
 

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Do you just need to fit the hole? Tell us exactly the diameter and number of threads in 10mm.

Or are you trying to look just like it? That is much tougher. It may be a TORX head but any good idea has several copy-cats.
 
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Thanks PRR, I can answer exactly tomorrow, but on the picture attached the 0.73" has a screw length of 0.6" (around 1.5 cm) . If I look at closer I would say around 8 or 9 threads / 1 cm.

@conanski (thanks) it is more classic I think : rigth angle, six facets, I want to change it because the screw-driver wasted the shape little by little... I can not change the bolt...

I come back with better datas and pictures tomorrow, that were screws used on a US loudspeaker... Boston Acoustics. NON existing anymore I believe.
 
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Thanks, I didn't know it was measured like that : so, yes, width is exactly 1/4, and around 15 "thread count" on the biggest, around 8 or 9 for the littliest 0.6" length...
Hey maybe Part Express, Solen, Meniscus ? Or closer in GB shop ?
 
Still got a 35mm camera in the attic? Camera tripod mount screw/hole is always 1/4-20, at least here. I bet this goes back to Kodak folding cameras (or before). I've never seen an adapter for any other screw, or notes like "US market".

If it goes in most of a turn and then wants to jam, it is 1/4-28.
 
Hi,
I need some screws that are made to imperial size standard but do not know how to name it to look for on ebay or elswhere.

Length is with the head: 0.625" or also 0.73"
Width is 0.25 for the screw
Head is only 0.37" width and 0.125 high". Loot at the pictures.
The screw-thread is less tigth than what I found in EC...

How would you name it in USA or Great Britain please ?
I’d say 10/24 socket head black oxide
1/2” or maybe 5/8” would be my guess
 
The picture is fuzzy so I can't quite tell the exact shape. It may be a shadow by the head that makes it look taller than it really is. The following matters only if cosmetics and a close visual replacement is important. If the head is fairly round and tall, it could be a fillister head screw. If the head is shorter, it could be a variation of a pan head screw. To look at options available and obtain dimensions, https://www.mcmaster.com/screws/ is a good option.
 
Buy a Torx wrench instead?
That would be less trouble, or put standard Allen bolts in its place.
Take a look at the thread profile, UNC profile is different from BSW and Metric, the thread angle is different.
UNC is mostly in cars, though.

If it is a through hole, a smaller standard fastener with washers will work, put a nut at the other end. Use a longer one, of course.