MAINTENANCE
37
9/230, 9/270, 9/300, 12/235, 17/235, 21/215, 9/230HA, 9/270HA, 9/300HA, 12/235HA, 17/235HA, 21/215HA
TORQUE VALUES
TABLE 1
INCH FASTENERS
NOMINAL DESIGN TORQUE
8AE J249
GRADE 5
(HEAD MARKING)
8AE J249
GRADE 8
(HEAD MARKING)
TYPICAL RECTANGULAR TORQUE
PATTERN
CAPSCREW
OR NUT
THREAD SIZE
AND PITCH
TYPICAL SQUARE TORQUE
PATTERN
(Nm.)
(FT–LBF)
(Nm.)
(FT–LBF)
1/4 – 20
11
8
16
12
5/16 – 18
24
17
33
25
3/8 – 16
42
31
59
44
7/16 – 14
67
49
95
70
1/2 – 13
102
75
144
106
9/16 – 12
148
109
208
154
5/8 – 11
203
150
287
212
TYPICAL CIRCULAR TORQUE
3/4 – 10
361
266
509
376
TYPICAL CIRCULAR TORQUE
PATTERN
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