Hex Jack Screws are available in zinc or yellow zinc finish and also comes in stainless steel. All Jack Screws come in a size of 3/16 "around the head flats and with a 4-40 thread. They are widely used in computer applications, similar to standoffs but with a longer protruding thread.

AFT Approved Vendor
Hex Jack Screw (AF) Male/Female, 4-40 x 5/16", Steel, Zinc Plated (250/Pkg.)
$36.36
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