Description Hex Nut Profile Standard Locking Type Nylon Insert Thread Direction Right Hand Finished Material 18-8 Stainless Steel Thread Size 1/4“-20 Width 7/16“ Height 5/16“ Insert Maximum Temperature 220° F Drive Style External Hex Nut Type Hex, Locknut Performance Vibration Resistant, Corrosion Resistant System of Measurement Inch Thread Fit Unified Standard Class 2B Thread Spacing Coarse Thread Type UNC Country of Origin China, Philippines, Taiwan DFARS Compliance Not Specialty Metals Compliant ECCN EAR99 REACH Compliance REACH (EC 1907/2006) (01/23/2024, 240 SVHC) Compliant RoHS Compliance RoHS 3 (2015/863/EU) Compliant Schedule B Number 731816.0000 USMCA Qualifying No Versatile yet economical, these are the most commonly used locknuts. The nylon insert grips the screw to prevent loosening from moderate vibration without damaging threads. However, the insert may become brittle if exposed to high temperatures. These locknuts are reusable a handful of times, but the holding power decreases with each use. 18–8 Stainless Steel—The choice for wet and outdoor environments, these locknuts resist rust. However, they won’t hold up to the harsh chemicals that 316 stainless steel can.
