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MINIMUM HARDWARE TIGHTENING TORQUES
IN NEWTON-METERS (FOOT POUNDS) FOR NORMAL ASSEMBLY APPLICATIONS
INCH NON-FLANGED HARDWARE AND LOCKNUTS
SAE GRADE 2
NOMINAL UNPLATED
PLATED
SIZE
or
W/ZnCr
PLATED
SILVER
GOLD
1/4
6.2 (55)*
8.1 (72)*
5/16
13 (115)*
17 (149)*
3/8
23 (17)
30 (22)
7/16
37 (27)
47 (35)
1/2
57 (42)
73 (54)
9/16
81 (60)
104 (77)
5/8
112 (83)
145 (107)
3/4
198 (146)
256 (189)
7/8
193 (142)
248 (183)
1
289 (213)
373 (275)
NOTE: Torque values shown with * are inch pounds.
SAE GRADE 2
SAE GRADE 5
GRADE IDENTIFICATION
GRADE A NO NOTCHES
GRADE B ONE CIRCUMFERENTIAL NOTCH
GRADE C TWO CIRCUMFERENTIAL NOTCHES
86529681 REV F 5.2
SECTION 4 - MAINTENANCE
SAE GRADE 5
UNPLATED
PLATED
or
W/ZnCr
PLATED
SILVER
GOLD
9.7 (86)*
13 (112)*
20 (178)*
26 (229)*
35 (26)
46 (34)
57 (42)
73 (54)
87 (64)
113 (83)
125 (92)
163 (120)
174 (128)
224 (165)
306 (226)
397 (293)
495 (365)
641 (473)
742 (547)
960 (708)
IDENTIFICATION
CAP SCREWS AND CARRIAGE BOLTS
SAE GRADE 8
LOCKNUTS
GRADE IDENTIFICATION
4-49
SAE GRADE 8
UNPLATED
PLATED
or
W/ZnCr
w/GR5
PLATED
SILVER
GOLD
14 (121)*
18 (157)*
8.5 (75)*
28 (250)*
37 (324)*
17.5 (155)*
50 (37)
65 (48)
31 (23)
80 (59)
104 (77)
50 (37)
123 (91)
159 (117)
76 (56)
176 (130)
229 (169)
111 (82)
244 (180)
316 (233)
153 (113)
432 (319)
560 (413)
271 (200)
698 (515)
904 (667)
437 (323)
1048 (773) 1356 (1000)
654 (483)
REGULAR NUTS
SAE GRADE 5
HEX NUTS
GRADE IDENTIFICATION
GRADE A NO MARKS
GRADE B THREE MARKS
GRADE C SIX MARKS
MARKS NEED NOT BE LOCATED
AT CORNERS
GRADE A NO MARK
GRADE B LETTER B
GRADE C LETTER C
LOCKNUTS
GR.B
GR.C
NOMINAL
w/GR8
SIZE
BOLT
BOLT
12.2 (109)*
1/4
25 (220)*
5/16
44 (33)
3/8
71 (53)
7/16
108 (80)
1/2
156 (115)
9/16
215 (159)
5/8
383 (282)
3/4
617 (455)
7/8
924 (681)
1
SAE GRADE 8
HEX NUTS
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