Operating Manual

Appendix: Tabular Data
Page 36 Guide to Ultrasonic Inspection of Fasteners
28-THREAD SERIES, 28UN
Sizes
Primary
in.
Secondary
in.
Basic Major Diameter
in.
Tensile Stress Area
Sq. in.
12(.216) 0.2160 0.0258
1/4 0.2500 0.0364
5/16 0.3125 0.0606
3/8 0.3750 0.0909
7/16 0.4375 0.1274
1/2 0.5000 0.170
9/16 0.5625 0.219
5/8 0.6250 0.274
11/16 0.6875 0.335
3/4 0.7500 0.402
13/16 0.8125 0.475
7/8 0.8750 0.554
15/16 0.9375 0.640
1 1.0000 0.732
1 1/16 1.0625 0.830
1 1/8 1.1250 0.933
1 3/16 1.1875 1.044
1 1/4 1.2500 1.160
1 5/16 1.3125 1.282
1 3/8 1.3750 1.411
1 7/16 1.4375 1.55
1 1/2 1.5000 1.69
20-THREAD SERIES, 20UN
Sizes
Primary in.
Secondary
in.
Basic Major Diameter
in.
Tensile Stress Area
Sq. in.
1/4 0.2500 0.0318
5/16 0.3125 0.0547
3/8 0.3750 0.0836
7/16 0.4375 0.1187
1/2 0.5000 0.160
9/16 0.5625 0.207
5/8 0.6250 0.261
11/16 0.6875 0.320
3/4 0.7500 0.386
13/16 0.8125 0.458
7/8 0.8750 0.536
15/16 0.9375 0.620
1 1.0000 0.711
1 1/16 1.0625 0.807
1 1/8 1.1250 0.910
1 3/16 1.1875 1.018
1 1/4 1.2500 1.133
1 5/16 1.3125 1.254
1 3/8 1.3750 1.382
1 7/16 1.4375 1.51
1 1/2 1.5000 1.65
1 9/16 1.5625 1.80
1 5/8 1.6250 1.95
1 11/16 1.6875 2.11
1 3/4 1.7500 2.27
1 13/16 1.8125 2.44
1 7/8 1.8750 2.62
1 15/16 1.9375 2.80
2 2.0000 2.99
2 1/8 2.1250 3.39
2 1/4 2.2500 3.81
2 3/8 2.3750 4.25
2 1/2 2.5000 4.72
2 5/8 2.6250 5.21
2 3/4 2.7500 5.73
2 7/8 2.8750 6.27
3 3.0000 6.84