Thread Sizes: 1/2-13 Material: Steel Pressure: Heavy End Pressure Start (lbs.): 2.5 End Pressure Full (lbs.): 10 Body Length: 7/8 Nose Diameter: .249 Projection: 1/4 Locking Element: No Knurl Diameter: 1" Knurl Thickness: 3/8 Category: Heavy Pressure