Unboxing 1/4-28 Thread Dimensions
LANG 971 - 48-Piece SAE and Metric Thread Restorer Kit What DO all of these screw and bolt sizes mean? In this video, we break down how screws & bolts are sized and how the US 1/4''-28 UNF thread drill ANSI External Screw Threads Size Tolerances Chart 1/4-28 SAE-LT taper threads are designed to be assembled into a 1/4-28 UNF, Class 3B straight threaded hole; the tap drill must not exceed .215" in diameter. ...