NSN 4920-01-479-1864

Tool is a precision alignment pin that expands to tighten up hole clearance. Pin is an assembly of female split bushings separated by male segments on a center spindle that expands when drawn together. Pin is approximately 0.386 inches diamter with a crop length of aprooximately 1 inch. One end features a hex hut and a washer. The center spindle has an interal hex socket on the same end as the hex nut. In expand, hold the enter spindle stationary with a 0.125 hext key while tightening the hext nut with a 0.562 open-end wrench. Components are either 17-4 ph stainless steel or alloy steel with black oxide coating.

Manufacturer part number 1C7178P02 for national stock number 4920014791864.