Technical details

• Hi-Shear drawing HL241 revision 20 identifies this designation as a HI-LOK pin with a 100-degree flush shear head.
• Dash 8 references the 1/4 in base size. The drawing row lists 9/32 in nominal pin diameter and head diameter A of 0.4210 to 0.4260 in.
• Shank D is 0.2802 to 0.2807 in without coating, plating or solid film and 0.2797 to 0.2807 in with it. The drawing allows a 0.0002 in increase in maximum D for aluminum coating, plating or solid film.
• Grip dash 7 denotes 0.4375 in maximum grip under the drawing ordering rule.
• The diameter row specifies a modified 0.2500-28 UNJF-3A thread.
• The drawing specifies A-286 high-temperature alloy to AMS 5737 or AMS 5731.
• Finish code AZ lists HI-KOTE 1 or HI-KOTE 1 NC aluminum coating to Hi-Shear Specification 294, black color on the thread end and cetyl alcohol lubricant to Specification 305.