TYPES OF SCREW HEADS SQUARE - AN OVERVIEW

This screw might be screwed or driven twice the velocity of other screw types as a consequence of its double thread structure.ASME B18.two.9 "Straightness Gage and Gaging for Bolts and Screws" was designed to deal with this problem. Per the scope with the standard, it describes the gage and method for examining bolt and screw straightness at most m