TM 1-1520-240-BD 2-7.  SUBSTITUTE HUCK, HI-LOK, OR NAS BOLTS . Substitute HUCK, HI-LOK or NAS bolts as follows: HUCK PART NO. HI-LOK PART NO. NAS PART NO. HOLE DIA (INCHES) R3001-5 HL18-5 NAS1465 0.161 to 0.164 R3001-6 HL18-6 NAS1466 0.185 to 0.188 R3001 -8 HL18-81 NAS1468 0.242 to 0.246 R3001-10 HL18-10 NAS1470 0.307 to 0.310 R3002-5 HL21-5 - 0.161 to 0.164 R3002-6 HL21-6 NAS1956 0.185 to 0.188 R3002-8 HL21 -8 NAS1458 0.242 to 0.246 R3002-10 HL21-10 NAS1460 0.307 to 0.310 NOTE · Dash numbers for all bolts are the same. · Hole sizes apply to high-shear requirements. · Hole sizes do not apply to fasteners of splices installed at sta 160.219 and 439.71. 2-8.  SUBSTITUTE JO-BOLTS OR V-BOLTS . JO-BOLT V-BOLT HOLE DIA PART NO. PART NO. (INCHES) WP 164 BA5A*H 0.164 to 0.168 WP 200 BA6A*H 0.199 to 0.203 WP 260 BA8A*H 0.261 to 0.265 WP 312 BA1OA*H 0.313 to 0.317 WF164 BA5A*F 0.164 to 0.168 WF200 BA6A*F 0.199 to 0.203 WF260 BA8A*F 0.261 to 0.265 WF312 BA1OA*F 0.313 to 0.317 NOTE · JO-BOLTS numbers refer to its diameter. · The  asterisk  (*)  is  the  position  for  the length dash number. · These   fasteners   are   used   mainly   in blind installations. 2-9.   SUBSTITUTE  STANDARD  BOLTS  FOR  HUCK BOLTS. a. Bolts  or  screws  can  be  substituted  for  HUCK bolts as follows: (1)      Use   standard   bolts   or   screws   only   when HUCK bolts or similar fasteners are not available. (2)  Hole diameter must allow thread through with- out force, but bolt shank must be push fit b. When   bolts   replace   HUCK   bolts   under   shear forces,  use  NAS1103,  NAS1303,  NAS464,  NAS624  or Hi-lok HL-18 bolts. c. When  bolts  replace  HUCK  bolts  under  tension forces, use NAS624 bolts. d. When     replacing     3/16-inch     diameter     (under tension forces) HUCK bolts, use NAS1303 bolts. e. For emergencies, any steel bolt or screw of tensile strength 125.000 psi and nominal hole diameter may be used.  This fastener must be replaced within 25 flight hours. 2-38