Torque vs Tension Bolts Table Chart SAE J429 Bolts

ANSI Hardware Design Data
Torque Design and Applications

The following chart estimates the applied tension clamp force at a defined torque and friction for SAE J429 Grade 2, 5 and 8 bolts.

Nominal Dia.
(in.)
Threads
per inch
 
Grade 2
Grade 5
Grade 8
Clamp Load (Lbs.)
Tightening
Torque
Clamp Load
(Lbs.)
Tightening
Torque
Clamp Load
(Lbs.)
Tightening
Torque
K = 0.15
K = 0.18
K = 0.20
K = 0.15
K = 0.18
K = 0.20
K = 0.15
K = 0.18
K = 0.20
Unified Coarse Thread Series
1/4
20
1313
49 in-lbs
59 in-lbs
66 in-lbs
2029
76 in-lbs
91 in-lbs
101 in-lbs
2864
107 in-lbs
129 in-lbs
143 inlbs
5/16
18
2163
101
122
135
3342
157
188
209
4719
221
265
295
3/8
16
3196
15 ft-lbs
18 ft-lbs
20 ft-lbs
4940
23 ft-lbs
28 ft-lbs
31 ft-lbs
6974
33 ft-lbs
39 ft-lbs
44 ft-lbs
7/16
14
4385
24
29
32
6777
37
44
49
9568
52
63
70
1/2
13
5853
37
44
49
9046
57
68
75
12771
80
96
106
5/8
11
9323
73
87
97
14408
113
135
150
20340
159
191
212
3/4
10
13797
129
155
172
21322
200
240
267
30101
282
339
376
7/8
9
11428
125
150
167
29436
322
386
429
41556
455
545
606
1
8
14992
187
225
250
38616
483
579
644
54517
681
818
909
 
 
Fine Thread Series
1/4
28
1500
56 in-lbs
68 in-lbs
75 in-lbs
2319
87 in-lbs
104 in-lbs
116 in-lbs
3274
123 in-lbs
147 in-lbs
164 inlbs
5/16
24
2395
112
135
150
3702
174
208
231
5226
245
294
327
3/8
24
3623
17 ft-lbs
20 ft-lbs
23 ft-lbs
5599
26 ft-lbs
31 ft-lbs
35 ft-lbs
7905
37 ft-lbs
44 ft-lbs
49 ft-lbs
7/16
20
4897
27
32
36
7568
41
50
55
10684
58
70
78
1/2
20
6598
41
49
55
10197
64
76
85
14396
90
108
120
5/8
18
10558
82
99
110
16317
127
153
170
23036
180
216
240
3/4
16
15385
144
173
192
23776
223
267
297
33566
315
378
420
7/8
14
12609
138
165
184
32479
355
426
474
45853
502
602
669
1
14 (UNS)
16827
210
252
280
43343
542
650
722
61190
765
918
1020

Notes:

Clamp load estimated as 75% of proof load for specified bolts. Torque values for ¼ and 5/16-inch series are in inch-pounds. All other torque values are in foot-pounds. Torque values calculated from formula T = KDF

Where:

D is the nominal diameter,
F is the clamp load
K=0.15 for “lubricated” conditions
K=0.18 for zinc plated and dry conditions
K=0.20 for plain and dry conditions

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