Operating Manual

Appendix: Tabular Data
Page 32 Guide to Ultrasonic Inspection of Fasteners
EXTRA FINE THREAD SERIES, UNEF AND NEF
Sizes
in.
Basic Major
Diameter in.
Threads per in.
Tensile Stress Area
Sq. in.
12(.216) 0.2160 32 0.0270
1/4 0.2500 32 0.0379
5/16 0.3125 32 0.0625
3/8 0.3750 32 0.0932
7/16 0.4375 28 0.1274
1/2 0.5000 28 0.170
9/16 0.5625 24 0.214
5/8 0.6250 24 0.268
11/16 0.6875 24 0.329
3/4 0.7500 20 0.386
13/16 0.8125 20 0.458
7/8 0.8750 20 0.536
15/16 0.9375 20 0.620
1 1.0000 20 0.711
1 1/16 1.0625 18 0.799
1 1/8 1.1250 18 1.901
1 3/16 1.1875 18 1.009
1 1/4 1.2500 18 1.123
1 5/16 1.3125 18 1.244
1 3/8 1.3750 18 1.370
1 7/16 1.4375 18 1.503
1 1/2 1.5000 18 1.64
1 9/16 1.5625 18 1.79
1 5/8 1.6250 18 1.94
1 11/16 1.6875 18 2.10
FINE THREAD SERIES, UNF AND NF
Sizes
in.
Basic Major
Diameter in.
Threads per in.
Tensile Stress Area
Sq. in.
0(.060) 0.0600 80 0.00180
1(.073) 0.0730 72 0.00278
2(.086) 0.0860 64 0.00394
3(.099) 0.990 56 0.00523
4(.112) 0.1120 48 0.00661
5(.125) 0.1250 44 0.00830
6(.138) 0.1380 40 0.01015
8(.164) 0.1640 36 0.01474
10(.190) 0.1900 32 0.0200
12(.216) 0.2160 28 0.0258
1/4 0.2500 28 0.0364
5/16 0.3125 24 0.0580
1/3 0.3750 24 0.0878
7/16 0.4375 20 0.1187
1/2 0.5000 20 0.1599
9/16 0.5625 18 0.203
5/8 0.6250 18 0.256
3/4 0.7500 16 0.373
7/8 0.8750 14 0.509
1 1.000 12 0.663
1 1/8 1.1250 12 0.856
1 1/4 1.2500 12 1.073
1 3/8 1.3750 12 1.315
1 1/2 1.5000 12 1.581