Minimum hardware tightening torques, Locknuts – Buhler 2425 User Manual
Page 365
SECTION 5 - SPECIFICATIONS
5-35
MINIMUM HARDWARE TIGHTENING TORQUES
IN FOOT POUNDS (NEWTON-METERS) FOR NORMAL ASSEMBLY APPLICATIONS
INCH HARDWARE AND LOCKNUTS
1/4
55* (6.2)
7.2* (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 (0904) 258 (350)
364 (494)
7/8
1
213 (289)
275 (373)
547 (742)
708 (960) 773 (1048) 1000 (1356) 386 (523)
545 (739)
1
NOMINAL
SIZE
SAE GRADE 2
LOCKNUTS
UNPLATED
PLATED
w/ZnCr
NOMINAL
SIZE
SAE GRADE 5
SAE GRADE 8
or
PLATED
SILVER
GOLD
UNPLATED
PLATED
w/ZnCr
or
PLATED
SILVER
GOLD
UNPLATED
PLATED
w/ZnCr
or
PLATED
SILVER
GOLD
GR.B
GR.C
w/GR5
BOLT
w/GR8
BOLT
NOTE: Torque values shown with * are inch pounds.
IDENTIFICATION
CAP SCREWS AND CARRIAGE BOLTS
GRADE 2 SAE
GRADE 5 SAE
GRADE 8 SAE
REGULAR NUTS
SAE GRADE 5
HEX NUTS
SAE GRADE 6
HEX NUTS
LOCKNUTS
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 A NO MARK
GRADE B LETTER B
GRADE C LETTER C
GRADE IDENTIFICATION
AT CORNERS