knurled washer for sale, brand-new and used.

The Wabash Electric ER-12A Electric Rotator is an economical unit that runs at an approximate speed of 3,000 RPM at full load. The chuck is specifically designed to securely mount the Stroboscope Discs (RA-21), but may also be useful in spinning a variety of similar items such as a color disc or a siren disc. The simple chuck has a threaded section with a large knurled nut for hand tightening.