Partially Threaded Bolt
Partially Threaded Bolt
(OP)
How do I find the strength of my bolt if it is only partially threaded?
There is the general rule that a half inch bolt needs an half inch of thread to fully develop. I can't get a half inch, so what do I do?
There is the general rule that a half inch bolt needs an half inch of thread to fully develop. I can't get a half inch, so what do I do?






RE: Partially Threaded Bolt
BA
RE: Partially Threaded Bolt
RE: Partially Threaded Bolt
Sufficient Thread Engagement: "Having the end of the bolt extending beyond or at least flush with the outer face of the nut; a condition that develops the strength of the bolt."
JWB
RE: Partially Threaded Bolt
RE: Partially Threaded Bolt
Dik
RE: Partially Threaded Bolt
RE: Partially Threaded Bolt
In that context I have heard about the 1 diameter depth on the plate to develop the bolt capacity.
No sense to speculate unless he clarifies
RE: Partially Threaded Bolt
Dik
RE: Partially Threaded Bolt
RE: Partially Threaded Bolt
BA
RE: Partially Threaded Bolt
Have a look at this site:-
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Your thread engagement could be very important, you need to look at the strength of the plate your tapping in comparison with the bolt grade you are using.
desertfox
RE: Partially Threaded Bolt
RE: Partially Threaded Bolt
The first thread of the bolt is only half-size (half-cut) its first 180 degrees, and the next 90-some-odd degrees may appear to be full-sized, but that part of the thread is is not fully supported by metal between the thread's upper face and the "tip" of the nut.
Result? Much less strength in that first "thread" than in the 2nd, 3rd, 4th, ... ) 32 threads (or whatever your TPI number is). And it is the rest of those that is the reason for the bolt's (nut's) AVERAGE published values.
RE: Partially Threaded Bolt
RE: Partially Threaded Bolt