Thread Sizes: 5/16-18 Material: Steel Pressure: Heavy End Pressure Start (lbs.): 1.5 End Pressure Full (lbs.): 6 Body Length: 5/8 Nose Diameter: 0.155 Projection: 3/16 Locking Element: No Knurl Diameter: 5/8 Knurl Thickness: 9/32 Category: Heavy Pressure