MIL-DTL-85667/12A
TABLE II. Mechanical properties.
Dia
Ultimate
Double Pin Test Pin Test
Max
Thread
Fatigue Test
Dash Tensile
Area
Shear
Diameter Dia Area
Install
Loading Lbs ± 2%
2
2
Number Strength
In
Strength (± .0005)
In
Torque
(c)
Lbs-Min
(b)
Lbs-Min
In
(a)
In-Lbs
Max
Min
(b)
(a)
(a)
-3
3,620
.0226
5,380
.1900
.0284
60
1,450
145
-4
6,470
.0404
9,300
.2500
.0491
115
2,590
259
-5
10,200
.0640
14,600
.3125
.0767
185
4,080
408
-6
15,200
.0951
21,000
.3750
.1104
335
6,080
608
-7
20,600
.1288
28,600
.4375
.1503
540
8,240
824
-8
27,500
.1717
37,300
.5000
.1963
805
11,000
1,100
-9
34,800
.2176
47,200
.5625
.2485
1080
13,920
1,392
-10
43,600
.2724
58,300
.6250
.3068
1560
17,440
1,744
-12
63,200
.3953
83,900
.7500
.4418
2930
25,280
2,528
(a) Shear test performed on pins ground to pin test diameter. The shear values are based on a
minimum shear strength of 95 ksi and the stress area at the test diameter.
(b) The ultimate tensile strength values are calculated on the basic pitch diameter of the external
thread and a tensile strength of 160 ksi.
(c) Maximum fatigue load is based on 40% of the ultimate tensile strength. Minimum fatigue load
is 10% of maximum fatigue load.
TABLE III. Bolt grips and lengths.
-3 Diameter
-4 Diameter
-5 Diameter
Grip
Bolt
Unthreaded
Unthreaded
Unthreaded
Number
Design
Pin Length
Bolt
Pin Length
Bolt
Pin Length
Bolt
Grip
(See Figure 1)
Length
(See Figure 1) Length
(See Figure 1) Length
.811
.405
.748
.405
.889
.375
.405
6
.874
.468
.811
.468
.952
.438
.468
7
.936
.530
.873
.530
1.014
.500
.530
8
.998
.592
.935
.592
1.076
.562
.592
9
1.061
.655
.998
.655
1.139
.625
.655
10
1.124
.718
1.061
.718
1.202
.688
11
.718
1.186
.780
1.123
.780
1.264
.750
12
.780
1.248
.842
1.185
.842
1.326
.812
13
.842
1.311
.905
1.248
1.389
.905
.875
14
.905
1.374
.968
1.311
.968
1.452
.938
.968
15
1.436
1.030
1.373
1.030
1.514
1.000
1.030
16
1.498
1.435
1.092
1.092
1.576
1.062
1.092
17
.1.561
1.155
1.498
1.155
1.639
1.125
1.155
18
1.624
1.218
1.561
1.702
1.218
1.188
1.218
19
1.686
1.280
1.623
1.280
1.764
1.250
1.280
20
1.748
1.234
1.685
1.234
1.826
1.312
1.342
21
1.811
1.405
1.748
1.405
1.889
1.375
1.405
22
1.874
1.468
1.811
1.952
1.438
1.468
1.468
23
1.936
1.530
1.873
1.530
2.014
1.500
1.530
24
1.998
1.592
2.076
1.562
1.592
25
2.061
1.655
2.139
1.625
1.655
26
2.124
1.718
2.702
1.688
1.718
27
1.780
2.264
1.750
1.780
28
2.186
2.326
1.812
1.842
29
2.389
1.875
1.905
30
2.452
1.938
1.968
31
3