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Section 6 - Specifications
Hardware Torque Values - Inch
Nominal
Size
SAE Grade 2 SAE Grade 5 SAE Grade 8 Locknuts
Unplated
or
Plated
Silver
Plated
W/zncr
Gold
Unplated
or
Plated
Silver
Plated
W/zncr
Unplated
or
Plated
Silver
Plated
W/zncr
GR.B w/
GR5 Bolts
GR.C w/
GR5 Bolts
1/4 55* (6.2) 7.2* (8.1) 86* (9.7) 112* (13) 121* (14) 157* (18) 61* (6.9) 86* (9.8)
5/16 115* (13) 149* (17) 178* (20)
229* (26) 250* (28) 324* (37) 125* (14) 176* (20)
3/8 17 (23) 22 (30) 26 (35) 34 (46) 37 (50) 48 (65) 19 (26) 26 (35)
7/16
27 (37) 35 (47) 42 (57) 54 (73) 59 (80) 77 (104) 30 (41) 42 (57)
1/2
42 (57) 54 (73) 64 (87) 83 (113) 91 (123) 117 (159) 45 (61) 64 (88)
9/16 60 (81) 77 (104) 92 (125) 120 (163) 130 (176) 169 (229)
65 (88) 92 (125)
5/8 83 (112) 107 (145) 128 (174) 165 (224) 180 (244) 233 (316) 90 (122) 127 (172)
3/4 140 (198) 189 (256) 226 (306) 293 (397) 319 (432) 413 (560) 160 (217) 226 (306)
7/8 142 (193) 183 (248) 365 (495) 473 (641) 515 (698)
667 (0904)
258 (350) 364 (494)
1 213 (289) 275 (373) 547 (742) 708 (960)
773 (1048)
1000 (1356)
386 (523) 545 (739)
NOTE: Torque values shown with * are inch pounds.
Identification of Hex Cap Screws and Carriage Bolts
Minimum hardware tightening torques
In foot pounds (newton-meters) for normal assembly applications.
Inch hardware and locknuts
F6-2
Locknuts
Grade Identification
Grade A: No Notches
Grade B: One Circumferential Notch
Grade C: Two Circumferential Notches
Grade Identification
Grade A: No Mark
Grade B: Letter B
Grade C: Letter C
Grade Identification
Grade A: No Marks
Grade B: Three Marks
Grade C: Six Marks
Marks need not be located ta corners
SAE Grade 5
Hex Nuts
SAE Grade 6
Hex Nuts
Regular Nuts
Grade 2 SAE
Bolts
Grade 5 SAE
Bolts
Grade 8 SAE
Bolts
B