clamp load - bolt vs. stud and nut
clamp load - bolt vs. stud and nut
(OP)
Does anyone out there know if there is any difference in the clamp load generated in a joint using a stud and nut, versus the same joint using a capscrew?
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clamp load - bolt vs. stud and nut
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RE: clamp load - bolt vs. stud and nut
Depending on the type of cap screw and type of nut, differences in the head size (bearing area or contact area) can/may affect the relationship of torque vs. preload.
Both effects are likely pretty small (less than the error inherent in estimating preload from torque alone).
RE: clamp load - bolt vs. stud and nut
Assuming that the the desired bolt stress is identical in both cases, it's a bit of a wash: The Effective Length of a joint contained by a stud and two nuts is equal to the the Grip Length plus one-half of each nut height. Thus, this usually becomes the Grip Length plus one Nominal Diameter. However, when working with a bolt and one nut, the Effective Length is equal to the Grip Length plus one-half the nut height plus one-third the height of the bolt head. Therefore, since the former has a longer Effective Length, it has more clamping effect.
Ciao,
HevïGuy
www.heviitech.com