SECTION 4 - MAINTENANCE
4-2
NOTE: Torque values shown with * are inch pounds.
IDENTIFICATION
CAP SCREWS AND CARRIAGE BOLTS
LOCKNUTS
GRADE A NO MARK
1 289 (213) 373 (275) 742 (547) 960 (708) 1048 (773) 1356 (1000) 654 (483) 924 (681) 1
7/8 193 (142) 248 (183) 495 (365) 641 (473) 698 (515) 904 (667) 437 (323) 617 (455) 7/8
3/4 198 (146) 256 (189) 306 (226) 397 (293) 432 (319) 560 (413) 271 (200) 383 (282) 3/4
5/8 112 (83) 145 (107) 174 (128) 224 (165) 244 (180) 316 (233) 153 (113) 215 (159) 5/8
9/16 81 (60) 104 (77) 125 (92) 163 (120) 176 (130) 229 (169) 111 (82) 156 (115) 9/16
1/2 57 (42) 73 (54) 87 (64) 113 (83) 123 (91) 159 (117) 76 (56) 108 (80) 1/2
7/16 37 (27) 47 (35) 57 (42) 73 (54) 80 (59) 104 (77) 50 (37) 71 (53) 7/16
3/8 23 (17) 30 (22) 35 (26) 46 (34) 50 (37) 65 (48) 31 (23) 44 (33) 3/8
5/16 13 (115)* 17 (149)* 20 (178)* 26 (229)* 28 (250)* 37 (324)* 17.5 (155)* 25 (220)* 5/16
1/4 6.2 (55)* 8.1 (72)* 9.7 (86)* 13 (112)* 14 (121)* 18 (157)* 8.5 (75)* 12.2 (109)* 1/4
MINIMUM HARDWARE TIGHTENING TORQUES
IN NEWTON-METERS (FOOT POUNDS) FOR NORMAL ASSEMBLY APPLICATIONS
INCH NON-FLANGED HARDWARE AND LOCKNUTS
NOMINAL UNPLATED PLATED UNPLATED PLATED UNPLATED PLATED GR.B GR.C NOMINAL
SIZE or W/ZnCr or W/ZnCr or W/ZnCr w/GR5 w/GR8 SIZE
PLATED PLATED PLATED BOLT BOLT
SILVER GOLD SILVER GOLD SILVER GOLD
SAE GRADE 2 SAE GRADE 5 SAE GRADE 8 LOCKNUTS
SAE GRADE 2 SAE GRADE 5 SAE GRADE 8
REGULAR NUTS SAE GRADE 5
HEX NUTS
SAEGRADE8
HEX NUTS
GRADE IDENTIFICATION
GRADE A NO NOTCHES
GRADE B ONE CIRCUMFERENTIAL NOTCH
GRADE C TWO CIRCUMFERENTIAL NOTCHES
GRADE IDENTIFICATION
GRADE A NO MARKS
GRADE B THREE MARKS
GRADE C SIX MARKS
MARKS NEED NOT BE LOCATED
GRADE IDENTIFICATION
AT CORNERS
GRADE B LETTER B
GRADE C LETTER C
86529681 REV F 5.2
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