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Required information

For the C clamp shown, a force is applied at the end of the $0\mathrm{.}375$ in diameter handle. The screw is a $0\mathrm{.}75$ in$-6$ Acme thread $($from Figure $8-3),$ and is $10\mathrm{.}60$ in long overall, with a maximum of $8$ in possible in the clamping region. The handle and screw are both made from cold$-$drawn AISI $1006$ steel. The coefficients of friction for the screw and the collar are $0\mathrm{.}15.$ The collar, which in this case is the anvil striker's swivel joint, has a friction diameter of $1$ in $.$ It is desired that the handle will yield before the screw will fail.

Determine the maximum force that can be applied to the end of the handle to reach the point of yielding of the handle.

The maximum force that can be applied to the end of the handle to reach the point of yielding of the handle is $$ lbf$.$