Special Features:

After circular groove, first end has 0.6215-0.6230 inch across flats x 0.6875 long square shoulder. Shaft second end has axial and internal 0.250 inch diameter x 1.000 deep hole and 0.3125-24unf-3a x 0.625 long threads. Center of shaft has 0.875-7 left hand, double lead acme threads with pitch diameter 0.7906-0.8036. Material has magnetic permeability of less than 2.0

Properties:

A shaft having two or more different diameters (greater than 0.031 inches (0.79 millimeter)) along its length. It must have one or more of the following conditions: a specified surface finish designation in the range 1 to 125 microinches (0.025 to 3.2 micrometers) arithmetical average (aa), machined peripheral flat(s), circular groove(s), keyway(s), splines, threads, or holes. The ends and/or shoulders may be machined to accommodate bearings, couplings, and the like. It is not designed for use in aligning by fitting into corresponding holes of another item. For items used to support rotating members see axle(1), shouldered. For items not having any of the above conditions see pin, shoulder, headless. Excludes shaft(1), straight; and axle(1), straight.