Effective Threaded Hole Depth
Effective Threaded Hole Depth
(OP)
Is here a quick reference to effective threaded (tapped) hole depth? I realize this may be dependant on the grade of bolt used, pitch etc. Just looking for a quick reference or formula that may give some understanding.
Thanks!
Thanks!





RE: Effective Threaded Hole Depth
I very often use thread depth = 1.5 X bolt dia
usually for steels, as you say if it was a soft material
it may be 3 or 4 times bolt dia.
regards
desertfox
RE: Effective Threaded Hole Depth
Sometimes expressed as 1 to 2 X diameter of bolt.
However, this is reall rule of thumb stuff.
KENAT, probably the least qualified checker you'll ever meet...
RE: Effective Threaded Hole Depth
Thanks again!
RE: Effective Threaded Hole Depth
Another opinion: I always use the 2X bolt diameter that my CAD program (Solidworks) defaults to. The 1.5X rule of thumb is based on the typical strength of threads and is a bolt engagement rule, not a tap depth rule. Going to 2X usually means I can find a standard length bolt that gets at least 1.5x engagement in the hole.
Timelord
RE: Effective Threaded Hole Depth
I always work back from my fastener & material thickness to work out my hole dept then normally round up to the next 'round' number and make it a "min full thread" call out.
As to validating it, I believe there have been threads (no pun intended) about that before, if not on this forum then maybe forum725: Welding, Bonding & Fastener engineering. As I recall it my old stress man used to talk about the first few threads taking most of the load...
KENAT, probably the least qualified checker you'll ever meet...
RE: Effective Threaded Hole Depth
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It relates fastener tensile strength to thread shear strength.
Ted
RE: Effective Threaded Hole Depth
I read effective thread as meaning thread engagement.
Regards
desertfox
RE: Effective Threaded Hole Depth