Tensile Stress Area of Bolts  -  Imperial & Metric Threads


Mechanical Properties of Metric Bolts & Sets ISO.898

  

 

Nominal
Thread Diameter
 Imperial Threads
BSW
BSF
UNC
UNF
TPI
in2
TPI
in2
TPI
in2
TPI
in2
1/4
20
0.0320
26
0.0356
20
0.0324
28
0.0368
5/16
18
0.0527
22
0.0567
18
0.0532
24
0.0587
3/8
16
0.0779
20
0.0839
16
0.0786
24
0.0886
7/16
14
0.1069
18
0.1158
14
0.1078
20
0.1198
1/2
12
0.1385
16
0.1520
13
0.1438
20
0.1612
9/16
12
0.0183
16
0.1980
12
0.184
18
0.205
5/8
11
0.2270
14
0.2430
11
0.229
18
0.258
3/4
10
0.3360
12
0.3520
10
0.338
16
0.375
7/8
9
0.4630
11
0.4870
9
0.467
14
0.513
1
8
0.6080
10
0.6420
8
0.612
12
0.667

 

Nominal
Thread Diameter
Metric Threads
Course Pitch
Fine Pitch
TPI
mm2
TPI
mm2
M3
 0.5 5.03 0.35  
M4
 0.7 8.78 0.5  
M5
 0.8 14.2 0.5  
M6
 1.0 20.1 0.75 22.0
M8
 1.25 36.6 1.0 39.2
M10
 1.50 58.0 1.25 61.2
M12
 1.75 84.3 1.25 92.1
M14
 2.0 115 1.5 125.0
M16
 2.0 157 1.5 167.0
M18
 2.5 192 1.5  
 
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