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Bolt Torque table
Bolt Torque Table Estimated with clamp load as 75% of proof load as specified in SAE J429 and ASME 574
Socket Head Cap Screws
SAE 5
SAE 8
Steel Grade
Minimum Tensile Strength PSI
1/4-1/2" 180,000 5/8-1" 170,000
120,000
150,000
Nominal Dia. and Thread Pitch
Bolt Torque Specs in Foot Pounds or (Inch Pounds)
Dry
Lubed
Dry
Lubed
Dry
Lubed
1/4-20
(101)
(76)
(143)
(107)
(168)
(120)
1/4-28
(116)
(87)
(147)
(123)
(192)
(144)
5/16-18
(209)
(157)
(295)
(221)
(348)
(264)
5/16-24
(231)
(174)
(327)
(245)
(384)
(288)
3/8-16
(372)
(276)
44
33
51
38
3/8-24
(420)
(312)
49
37
58
43
7/16-14
49
37
70
52
81
61
7/16-20
55
41
78
58
91
68
1/2-13
75
57
106
80
124
93
1/2-20
85
64
120
90
140
105
5/8-11
150
113
212
159
238
179
5/8-18
170
127
240
180
270
202
3/4-10
267
200
376
282
423
317
3/4-16
297
223
420
315
472
354
7/8-9
429
322
606
455
682
511
7/8-14
474
355
669
502
752
564
1-8
644
483
909
681
1022
767
1-12 860 Lubed means cleaned dry bolts lubricated with a standard medium viscosity machine oil. Lubricate all contact areas of the bolts and washers. Lubricating the bolts is the suggested method. Thread Engagement 722 542 1020 765 1147
Figure 34
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