FED-STD-H28-14 Revision A:1983
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Screw-Thread Standards for Federal Services Section 14 Buttress Screw Threads-7 Deg./45 Deg. Flank Angles
09-06-1983
Requirements for Buttress type screw threads, their gages and acceptability standards. Having load flanks nearly perpendicular to the thread axis, minimizes the radial component of a single direction axial force applied to the load flanks.
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