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ASME B18.31.3 Threaded Rods

ASME B18.31.3 Threaded Rods

Dimensions of ASME B18.31.3 Threaded Rods

Nominal Size Diameter, D Threads Per Inch Umax = 2 Thread Pitches = 2P
UNC UNF 8UN UNC Threads UNF Threads 8UN Threads
1/4 0.2500 20 28 - 0.100 0.071 -
5/16 0.3125 18 24 - 0.111 0.083 -
3/8 0.3750 16 24 - 0.125 0.083 -
7/16 0.4375 14 20 - 0.143 0.100 -
1/2 0.5000 13 20 - 0.154 0.100 -
9/16 0.5625 12 18 - 0.167 0.111 -
5/8 0.6250 11 18 - 0.182 0.111 -
3/4 0.7500 10 16 - 0.200 0.125 -
7/8 0.8750 9 14 - 0.222 0.143 -
1 1.0000 8 12 - 0.250 0.167 -
1 1/8 1.1250 7 12 8 0.286 0.167 0.250
1 1/4 1.2500 7 12 8 0.286 0.167 0.250
1 3/8 1.3750 6 12 8 0.333 0.167 0.250
1 1/2 1.5000 6 12 8 0.333 0.167 0.250
1 5/8 1.6250 - - 8 - - 0.250
1 3/4 1.7500 5 - 8 0.400 - 0.250
1 7/8 1.8750 - - 8 - - 0.250
2 2.0000 4 1/2 - 8 0.444 -- 0.250
2 1/4 2.2500 4 1/2 - 8 0.444 - 0.250
2 1/2 2.5000 4 - 8 0.500 - 0.250
2 3/4 2.7500 4 - 8 0.500 - 0.250
3 3.0000 4 - 8 0.500 - 0.250
3 1/4 3.2500 4 - 8 0.500 - 0.250
3 1/2 3.5000 4 - 8 0.500 - 0.250
3 3/4 3.7500 4 - 8 0.500 - 0.250
4 4.0000 4 - 8 0.500 - 0.250

Notes : Non preferred size, not recommended for new design due to limited availability