SECTION 00 -- GENERAL INFORMATION -- CHAPTER 1
00-8
GRADE A NO MARK
NOTE: Torque values shown with * are inch pounds.
IDENTIFICATION
CAP SCREWS AND CARRIAGE BOLTS
LOCKNUTS
1 289 (213) 373 (275) 742 (547) 960 (708) 1048 (773) 1356 (1000) 523 (386) 739 (545) 1
7/8 193 (142) 248 (183) 495 (365) 641 (473) 698 (515) 904 (667) 350 (258) 494 (364) 7/8
3/4 198 (146) 256 (189) 306 (226) 397 (293) 432 (319) 560 (413) 217 (160) 306 (226) 3/4
5/8 112 (83) 145 (107) 174 (128) 224 (165) 244 (180) 316 (233) 122 (90) 172 (127) 5/8
9/16 81 (60) 104 (77) 125 (92) 163 (120) 176 (130) 229 (169) 88 (65) 125 (92) 9/16
1/2 57 (42) 73 (54) 87 (64) 113 (83) 123 (91) 159 (117) 61 (45) 88 (64) 1/2
7/16 37 (27) 47 (35) 57 (42) 73 (54) 80 (59) 104 (77) 41 (30) 57 (42) 7/16
3/8 23 (17) 30 (22) 35 (26) 46 (34) 50 (37) 65 (48) 26 (19) 35 (26) 3/8
5/16 13 (115*) 17 (149*) 20 (178*) 26 (229*) 28 (250*) 37 (324*) 14 (125*) 20 (176*) 5/16
1/4 6.2 (55*) 8.1 (72*) 9.7 (86*) 13 (112*) 14 (121*) 18 (157*) 6.9 (61*) 9.8 (86*) 1/4
MINIMUM HARDWARE TIGHTENING TORQUES
IN NEWTON-METERS (FOOT POUNDS) FOR NORMAL ASSEMBLY APPLICATIONS
INCH 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
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