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optimum tightening torque required for a bolt in rotating components and static components

thread404-512138

optimum tightening torque required for a bolt in rotating components and static components

optimum tightening torque required for a bolt in rotating components and static components

(OP)
optimum tightening torque required for bolt under static and dynamic conditions

Bolt size: M30,
Material: AISI4340 alloy steel
Grade (property class): 12.9
All Bolt threads to be lubricated with MoS2 grease during torque tightening.
Temperature variations will not be there.
Bolts are not subjected to any external loads.
If these bolts are used as foundation bolts of gear casing (static condition), What is the optimum tightening torque required?
suppose, if these bolts are used in flange coupling to connect the gear shaft with shaft of generator (dynamic condition). What is the optimum tightening torque required?

RE: optimum tightening torque required for a bolt in rotating components and static components

Ted

RE: optimum tightening torque required for a bolt in rotating components and static components

Quote (paulcook)

Wasn't aware that there are different torque recomendations based on static vs dynamic condition

There isn't

If you don't know what loads you need from your fasteners, you should be using the standard values. Unless you have a substrate issue, but that's more complicated.

RE: optimum tightening torque required for a bolt in rotating components and static components

How would you define 'optimum'?

Ted

RE: optimum tightening torque required for a bolt in rotating components and static components

Quote (hydtools)

How would you define 'optimum'?

Way back when, 'optimum' was 5% into yield.

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