Technical details

• Hi-Shear drawing HL20 revision 28 identifies this designation as a HI-LOK pin with a protruding tension head.
• The drawing row lists 1/4 in nominal pin diameter and head diameter A of 0.415 to 0.440 in.
• The finished shank D range in the drawing is 0.2485 to 0.2495 in.
• Grip dash 3 denotes 0.1875 in maximum grip under the drawing ordering rule.
• The diameter row specifies a modified 0.2500-28 UNJF-3A thread.
• The alloy steel material note lists AMS 6415, AMS 6349, AMS 6382 and AMS 6322.
• Finish code RB specifies cadmium plating to AMS-QQ-P-416 Type II, Class 2, violet to purple identification and cetyl alcohol lubricant to Hi-Shear Specification 305.