Square Key 100 × 12.7 × 12.7 mm – Part No. 0533

Fitted into opposing keyways, this key prevents relative rotation between a shaft and its mating component (pulley, gear, or coupling). Replace worn keys to restore a secure, backlash-free connection. Key features Standard square profile 12.7 mm × 12.7 mm for common ½″ keyways 100 mm usable length—cut or machine shorter if your pocket is narrower Chamfered ends for easier insertion and seating Supplied straight and lightly oiled ready for installation Specifications Item Value Part number 0533 Key profile Square, 12.7 mm × 12.7 mm Length 100 mm Material Plain-carbon steel (OEM grade) Application Shaft-to-hub drive key