McMaster 97135A280 High Strength Steel Nylon Insert Locknut, Pack of 5, Grade 8, Zinc Yellow Chromate Plated, 3 4" 10 Thread 35139666 Band Width 13 64 in Band Width 13 64 in SAE Grip Style Insulated Opening Type Adjustable Non Magnetic No Measuring Scale Yes Insulated Yes Tether Style Tether Capable Lockable No Adjustment Type Quick Adjust Ratcheting No Adjustable Wrench Type Insulated Adjustable Wrench Package Quantity 1 Thread Direction Right Hand Hex Nut Profile Standard Locking Type Nylon Insert Fastener Strength Rating High Finished Material Zinc Yellow Chromate Plated Steel Thread Size 3 4" 10 Width 1 1 16" Height 7 8" Fastener Strength Grade Class SAE Grade 8 Insert Maximum Temperature 185° F Drive Style External Hex Nut Type Hex The nylon insert grips the screw to prevent loosening from moderate vibration without damaging threads