STS Industrial - Bolts & Screws



ASME B18.6.2 Covers the complete general and dimensional data for slotted head cap screws, square head set screws, and slotted headless set screws.
ASME B1.1 UNC & UNF Class 2A Specifies the thread form, series, class, allowance, tolerance, and designation for unified screw threads.



Square head set screws, or jack bolts, are fully threaded fasteners with a square head and most commonly, a cup point (though other types of points are available. Square head set screws are manufactured from alloy steel for maximum strength, as well as high resistance to galling , wear, and fatigue. They have a large bearing area that provides positive gripping for a hand wrench. They are ideal for holding pulleys, collars, and other machinery shafts where fine adjustments are necessary.


Square Head Set Screw Head



Sources: ASTM Standards for Mechanical Fasteners and Related Processes 2nd Edition, Inch Fastener Standards 8th Edition, Kanebridge Fastener Reference Guide 4th Edition

Note: All material included on this page is informational only, and should not be used as one’s sole source for design purposes. STS Industrial, Inc. and its affiliates do not guarantee the accuracy of the information on this site, and retain no liability for the use or misuse of the information contained on this site.