1-3
1-2
GENERAL INFORMATION
MINIMUM HARDWARE TIGHTENING TORQUES
IN FOOT POUNDS (NEWTON-METERS) FOR NORMAL ASSEMBLY APPLICATIONS
METRIC HARDWARE AND LOCKNUTS
NOTE: Torque values shown with * are inch pounds.
IDENTIFICATION
HEX CAP SCREW AND CARRIAGE BOLTS
CLASSES 5.6 AND UP
MANUFACTURER’S IDENTIFICATION
HEX NUTS AND LOCKNUTS
CLASSES 05 AND UP
PROPERTY CLASS
PROPERTY CLASS
CLOCK MARKING
MANUFACTURER’S IDENTIFICATION
CLASS 5.8
CLASS 8.8
CLASS 10.9
LOCKNUT
NOMINAL
CL.8
SIZE
UNPLATED
PLATED
UNPLATED
PLATED
UNPLATED
PLATED
W/CL8.8
W/ZnCr
W/ZnCr
W/ZnCr
BOLT
M4
15*(1.7)
19*(2.2)
23*(2.6)
30*(3.4)
33*(3.7)
42*(4.8)
16*(1.8)
M6
51*(5.8)
67*(7.6)
79*(8.9)
102*(12)
115*(13)
150*(17)
56*(6.3)
M8
124*(14)
159*(18)
195*(22)
248*(28)
274*(31)
354*(40)
133*(15)
M10
21 (28)
27 (36)
32 (43)
41 (56)
45 (61)
58 (79)
22 (30)
M12
36 (49)
46 (63)
55 (75)
72 (97)
79 (107)
102 (138)
39 (53)
M16
89 (121)
117 (158)
137 (186)
177 (240)
196 (266)
254 (344)
97 (131)
M20
175 (237)
226 (307)
277 (375)
358 (485)
383 (519)
495 (671)
195 (265)
M24
303 (411)
392 (531)
478 (648)
619 (839)
662 (897)
855 (1160)
338 (458)
GENERAL INFORMATION
MINIMUM HARDWARE TIGHTENING TORQUES
IN FOOT POUNDS (NEWTON-METERS) FOR NORMAL ASSEMBLY APPLICATIONS
INCH HARDWARE AND LOCKNUTS
NOTE: Torque values shown with * are inch pounds.
IDENTIFICATION
CAP SCREWS AND CARRIAGE BOLTS
GRADE IDENTIFICATION
GRADE A NO NOTHCES
GRADE B ONE CIRCUMFERENTIAL NOTCH
GRADE C TWO CIRCUMFERENTIAL NOTCHES
LOCKNUTS
SAE GRADE 2
SAE GRADE 2
SAE GRADE 5
SAE GRADE 8
LOCKNUT
NOMINAL UNPLATED
PLATED
UNPLATED
PLATED
UNPLATED
PLATED
GR.B
GR.C
NOMINAL
SIZE
or
W/ZnCr
or
W/ZnCr
or
W/ZnCr
w/GR
5
w/GR
8
SIZE
PLATED
PLATED
PLATED
SILVER
GOLD
SILVER
GOLD
SILVER
GOLD
1/4
55*(6.2)
72*(8.1)
86*(9.7)
112*(13)
121*(14)
157*(18)
61* (6.9)
86* (9.8)
1/4
5/16
115*(13)
149*(17)
178*(20)
229*(26)
250*(28)
324*(37)
125* (14)
176* (20)
5/16
3/8
17 (23)
22 (30)
26 (35)
34 (46)
37 (50)
48 (65)
19 (26)
26 (35)
3/8
7/16
27 (37)
35 (47)
42 (57)
54 (73)
59 (80)
77 (104)
30 (41)
42 (57)
7/16
1/2
42 (57)
54 (73)
64 (87)
83 (113)
91 (123)
117 (159)
45 (61)
64 (88)
1/2
9/16
60 (81)
77 (104)
92 (125)
120 (163)
130 (176)
169 (229)
65 (88)
92 (125)
9/16
5/8
83 (112)
107 (145)
128 (174)
165 (224)
180 (244)
233 (316)
90 (122)
127 (172)
5/8
3/4
146 (198)
189 (256)
226 (306)
293 (397)
319 (432)
413 (560)
160 (217)
226 (306)
3/4
7/8
142 (193)
183 (248)
365 (495)
473 (641)
515 (698)
667 (904)
258 (350)
364 (494)
7/8
1
213 (289)
275 (373)
547 (742)
708 (960)
773 (1048)
1000 (1356)
386 (523)
545 (739)
1
SAE GRADE 5
SAE GRADE 8
REGULAR NUTS
SAE GRADE 5
HEX NUTS
SAE GRADE 8
HEX NUTS
GRADE A NO MARK
GRADE B LETTER B
GRADE C LETTER C
GRADE IDENTIFICATION
GRADE IDENTIFICATION
GRADE A NO MARKS
GRADE B THREE MARKS
GRADE C SIX MARKS
MARKS NEED NOT BE LOCATED
AT CORNERS
