Standard-Inch

Tight Tolerance Smooth Head Shoulder Screws are also known as Smooth Head Screws and Precision Grade Shoulder Screws. Smooth Head screws are used as fasteners joining two pieces of an assembly where maintaining alignment is critical. These screws have an unthreaded shoulder made with an undersized tolerance to fit bearings, linear motion bushings, and other precision components. Some product applications are: imaging equipment, surgical tools, measuring devices, laboratory instruments, enclosures, and optical fixtures. Screws are machined with hex socket, slotted and 6-lobe drives on precise unmarked smooth heads, with an undercut portion between the thread and shoulder to allow a close fit. The shoulder diameter tolerance is held to +0 to -.001 inches and the shoulder length tolerance is +.002 to -0 inches. Tight tolerance screws have a Class 2A thread fit for inch.