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Question regarding "standard" bolt shoulder lenghts

Question regarding "standard" bolt shoulder lenghts

Question regarding "standard" bolt shoulder lenghts

(OP)
Is there standardized formula or rule of thumb, for determining shoulder(shank)length versus total length, of a grade 8 hex head bolt? I am looking for a chart or a rule of thumb that shows the how long of a bolt is required
to get specific shoulder length. For instance. How long of a 5/8" bolt would I need to have 3 3/4" shoulder?

Thanks in advance.
 

RE: Question regarding "standard" bolt shoulder lenghts

minimum thread length = (2 X diameter)+1/4"
maximum thread length is longer

If you want a specific length of unthreaded shoulder then you may need to buy a shoulder bolt.

In your example above: minimum thread length = 2x5/8 + 1/4" = 1 1/2" so you would need a 5 1/4" long bolt, except they don't come in that length.  

RE: Question regarding "standard" bolt shoulder lenghts

For inch fasteners less than 6 inches:
Min thread length = 2*D + .250"
For inch fasteners greater than 6 inches:
Min thread length = 2*D + .500"

Shank length = Total Length - Thread Length

Ref: Shigley, Mechanical Engineering Design (2001)

You may also want to look into Bickford's book for more details about bolts and bolted joints.

RE: Question regarding "standard" bolt shoulder lenghts

(OP)
Thanks for the input. In my particular application I am dealing with shouldered bolts that we cut some of the threaded length off. We may use a 5/8 bolt that needs 5" of shoulder, but we only need "ѕ" of thread. Since they don't make a 5/8 bolt with 5" of shoulder that has only "ѕ" of thread, I use a standard full length bolt, and cut the un-needed threads off. Is there a way / formula to calculate the total bolt length given the shoulder length (not thread length)?
 

RE: Question regarding "standard" bolt shoulder lenghts

It's time to get to the library or use your books if you can't get the answer from the information above.  Good luck!

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