APT NAS897-A-0.8661-S 22.0mm HSS Tapered Chucking Reamer

This is a new, USA-made Alvord-Polk Tool (APT) chucking reamer conforming to NAS897 specification, designated NAS897-A-0.8661-S, with a nominal diameter of 22.0mm (0.8661 in) at the major cutting diameter. Constructed from HSS (High Speed Steel) as marked on the label, this reamer features a straight-flute, tapered body geometry — evident from the pronounced taper along its flute length — designed to produce precision-reamed holes to NAS897 Class A tolerances in aerospace and precision machining applications. The CHK RMR (Chucking Reamer) designation indicates it is intended for use in a machine spindle or chuck rather than hand operation, making it compatible with drill presses, mills, lathes, and similar machine tool setups. NAS897 is a National Aerospace Standard governing reamer geometry and dimensional tolerances, confirming this tool meets aerospace procurement requirements. The California Prop 65 warning label indicates cobalt and nickel content consistent with cobalt-alloyed HSS construction.

Product Specifications