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boner

Imperial bolt question...

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I’m trying to identify an imperial bolt and was wondering if someone could tell me what the upper section of the bolt with no thread on is called?

Is it different to a normal fully threaded bolt,  ie all the way to the head?

ive got the length / diameter / tpi sorted, just need one with the thread cut to the right length on the body of the bolt.

Thanks Boner.

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13 minutes ago, boner said:

I’m trying to identify an imperial bolt and was wondering if someone could tell me what the upper section of the bolt with no thread on is called?

Is it different to a normal fully threaded bolt,  ie all the way to the head?

ive got the length / diameter / tpi sorted, just need one with the thread cut to the right length on the body of the bolt.

Thanks Boner.

Hi Boner, yes shoulder is correct. A bolt is threaded part way along its length. If fully threaded up to the underside of the head then it is a set pin. Either type is measured from end to underside of head so length does not include the head.

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Thanks for the input.

The terminology I was looking for was ‘part threaded’ referring to the shoulder.

I’ve hopefully found what I’m looking for and ordered it.

 

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The area above the threaded part of a bolt is known as a shank. Bye, Peter B.

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3 hours ago, peterb said:

The area above the threaded part of a bolt is known as a shank. Bye, Peter B.

to me as well

 

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In the UK a fastener threaded all the way was referred to as a "Set Scew" or 'Machine Screw" , Bolts always had a shank and a threaded section I believe to reduce the stress concentration around the head when subject to high torque and high tension loads.

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2 hours ago, oz thumper said:

In the UK a fastener threaded all the way was referred to as a "Set Scew" or 'Machine Screw" , Bolts always had a shank and a threaded section I believe to reduce the stress concentration around the head when subject to high torque and high tension loads.

Correct and how we sold them here in UK

 

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Imperial bolt identification:

Well if it is powerful and down right scary, it is probably a Darth Vader bolt

 

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Minor hijack, any one found a source for Allan button top bolts ?

Edited by b40rt

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47 minutes ago, b40rt said:

Minor hijack, any one found a source for Allan button top bolts ?

FWB Products @ Stoke on Trent https://www.fwb.co.uk/ or Barfast http://home.btconnect.com/barfast/ these people also stock metric fine, I highly recommend Britannia Fasteners Burslem though they do not have a website.

Edited by trialsrfun

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