General > General Technical Chat

What bolt type please?

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eti:
I'm not a bolt and fastener expert, so I'm delegating this to someone who hopefully is. Can someone identify the thread and bolt type of this, please?

Many thanks

beanflying:
Not easy to do accurately from a Pic but based on a thread count over 10mm using your ruler it is just under 13 threads for 10mm so around 0.8mm pitch.

Diameter is roughly 5mm based on rotating the same scale so what you get is an M5 thread being most likely.

So use that same method your end to check it and do some simple math.

Also lash out and buy a cheap set of Digital Calipers and even a set of pitch gauges wont set you back very much.

Brumby:
Yep, I agree with Bean - M5 0.8mm pitch.

Here's a random M5 bolt I had at hand:



Mine is a hex head.  Yours looks like a round head.  Material looks like it could be brass.

Zoli:
M5X0.8 and 10-32(UNC) are interchangeable have limited interchangeability in real life(I've done it countless times). Judging on the shape of the of the screw, I tend for 10-32; but as I've said, they're interchangeable.
Edit: corrected statement.

eugene:
I count 12 threads per cm, not 13, and it looks smaller than 5 mm diameter to me. I'm nearly certain that it's a 10-32 screw, 7/8" long. The head is smaller than a typical pan head (probably came from something mass produced.) If the space for the head is small diameter and a pan head won't fit, a fillister head might.

And I disagree that M5x0.8 and 10-32 are interchangeable. Maybe in soft plastic where you can force a new set of threads, or with narrow nuts that only have a few threads, but generally, no.

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