Locknut, 3/8 -16, Compatible with Grainger Part Number 13N456, 13N457, 13N476, 15D802, 4NB84, 4NB86, 4NB87, 6EWK4, 6EWK5, Product Type Lock Nut, Compatible with Manufacturer Part Number ABS-13H-80HG, AC1-PH65-30G, AG1-PH65-08G, AG2-PH13-08G1, AG2-PH13-08G1E, AG2-SH08-08G, AG2-SH13-08GE, AG2-SH13-30G, AGW-SR14-30G, Compatible with Series Speedaire, Compatible with Brand MiTM.