Specifications:Precision locknuts for bearings and precision machine components.Material - AISI 4140 SCM 440Hardness - HRC 28-32Precision - ISO 4HThe series TMF locknut is designed with three locking inserts(pegs)that intersect the bore with an angle of 30o. This series is produced with tolerance class ISO 4H ground threads and is available in sizes 25 to 200 mm bore.