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Bolt tightening

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Plainsboro

Plainsboro

Structural
Joined
Oct 28, 2004
Messages
18
Location
US
I have a 1" dia bolt on which will act as a shaft or pin on which bearing will rest. Bearing will give only 4 kips of point load on 1" shaft. The shaft will be resting on two 3/16" thick plates. We will place nuts outside of plate to keep the shaft in place. AISC does provide pretension force in bolt if it is a slip critical or tension connection. But to me it is not. However I want to know Still how much nuts should be tightened. Thx a lot in advance.
 
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If it is not a slip critical condition, what are you trying to accomplich? Will finger tight work? Will turn of the nut method work? Will 1/4 turn past finger tight work?
 
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SperlingPE
Thx for ur time. There will be cables running on the bearings. As such there is no LATERAL FORCE. So bolt or shaft should stay and work even without nuts but we know in reality it doesnot happen.So I want to know that even though theoritically there is no lateral load, as per such and such spec we need to tighten the nut and bolt to such tension or torque.OR is there any spec stipulating minimum bolt torque for what so ever conn'n.
 
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In these types of situations, as SperlingPE has stated, you don't need a bolt torque. What you do need is to ensure that the nut does not become dieengaged. There are several methods for accomplishing this such as double nutting, cotter pin, lock washer, etc.

Double nutting with the second nut set to 1/4 past finger tight is an often used method.
 
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I agree entirely with steve1. A second nut locked tight to the first is often used.

As you are talking about cables I would assume that the forces present will be extremely variable. If this is the case, and the connections is structurally important, you may wish to go for a more defined solution.

Split pins and 'castle' nuts are cheap and mostly fool proof.

Also look at locking compounds - These 'glue' the nuts into position. Try the Loctite web site under their industrial products page.
 
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