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ASME B18.2.2 TABLE 1-1 Standard Dimensions for Square nuts, square machined nuts and heavy square nuts, inch series

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Square and hex machine screw nuts

Dimensional Drawing and Technical Diagrams

1925_LCZJDO_asme-b18.2.2-tabel-1-1.jpg

Key Dimensions and Technical Parameters

Dimensions in inches (1 inch=25.4 mm) sourceASME B18.2.2 table 1-1

Publication date: 2010
Nominal size or basic thread diameter

UNC (nr of threads x inch)

UNF (nr of threads x inch)

 F basic G min G max H min H max G1 min G1 max
inch mm
0 (0.060) 1.52 - 80 0.156 0.206 0.221 0.043 0.050 0.171 0.180
1 (0.073) 1.85 64 72 0.156 0.206 0.221 0.043 0.050 0.171 0.180
2 (0.086) 2.18 56 64 0.188 0.247 0.265 0.057 0.066 0.205 0.217
3 (0.099) 2.51 48 56 0.188 0.247 0.265 0.057 0.066 0.205 0.217
4 (0.112) 2.84 40 48 0.25 0.331 0.354 0.087 0.098 0.275 0.289
5 (0.125) 3.18 40 44 0.312 0.415 0.442 0.102 0.114 0.344 0.361
6 (0.138) 3.51 32 40 0.312 0.415 0.442 0.102 0.114 0.344 0.361
8 (0.164) 4.17 32 36 0.344 0.456 0.486 0.117 0.130 0.378 0.397
10 (0.190) 4.83 24 32 0.375 0.497 0.53 0.117 0.130

0.413

 0.433
12 (0.216) 5.49 24 28 0.438 0.581 0.619 0.148 0.161 0.482 0.505
1/4 (0.250)
 6.35 20 28 0.438 0.581 0.619 0.178 0.193 0.482 0.505
5/16 (0.312)
 7.94 18 24 0.562 0.748 0.795 0.208 0.225 0.621 0.65
3/8 (0.375)
 9.53 16 24 0.625 0.833 0.884 0.239 0.257 0.692 0.722

Reproduced by permission of DIN Deutsches Institut für Normung e. V. The definitive version for the implementation of this standard is the edition bearing the most recent date of issue, obtainable from Beuth Verlag GmbH, Burggrafenstraße 6, 10787 Berlin, Germany.
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