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Standard Threads

Internal Threads
ThreadHole Diameter(in)Max Thread Depth(in)
0-80 UNC0.0470.157
1-64 UNC0.0590.177
2-56 UNC0.0700.306
2-64 UNF0.0700.306
4-40 UNC0.0890.394
4-48 UNF0.0940.394
5-40 UNC0.1020.438
5-44 UNF0.1040.438
6-32 UNC0.1070.481
6-40 UNF0.1130.481
8-32 UNC0.1360.525
8-36 UNF0.1360.525
10-24 UNC0.1500.612
10-32 UNF0.1590.612
1/4-20 UNC0.2010.750
1/4-28 UNF0.2130.750
5/16-18 UNC0.2570.844
5/16-24 UNF0.2720.844
3/8-16 UNC0.3130.938
3/8-24 UNF0.3320.938
7/16-14 UNC0.3681.078
7/16-20 UNF0.3911.078
1/2-13 UNC0.4221.242
1/2-20 UNF0.4531.242
9/16-12 UNC0.4841.250
9/16-18 UNF0.5001.250
5/8-11 UNC0.5311.250
5/8-18 UNF0.5631.250
3/4-10 UNC0.6561.250
3/4-16 UNF0.6881.250
MetricHole Diameter(in)Max Thread Depth(in)
M2x0.40.0630.306
M2.5×0.450.0810.350
M3x0.50.0980.438
M3.5×0.60.1140.481
M4x0.70.1300.525
M5x0.80.1650.612
M6x1.00.1970.750
M8x1.250.2640.900
M10x1.50.3350.938
M12x1.750.4021.242
STI ThreadsHole Diameter(in)Max Thread Depth(in)
2-56 UNC0.0910.306
4-40 UNC0.1180.394
4-48 UNF0.1180.394
5-40 UNC0.1340.438
6-32 UNC0.1460.481
8-32 UNC0.1720.525
8-36 UNF0.1720.525
10-24 UNC0.2010.612
10-32 UNF0.2010.612
1/4-20 UNC0.2640.750
M2x0.40.0830.306
M2.5×0.450.1040.350
M3x0.50.1260.438
M4x0.70.1670.525
M5x0.80.2090.612
M6x1.00.2480.750
M8x1.250.3310.900
M10x1.50.4130.938
M12x1.750.4921.242

External Threads

ThreadBoss Diameter (in)Max Thread Length (in)
UNC/UNF
2-56 UNC0.0860.20
2-64 UNF0.0860.20
4-40 UNC0.1120.22
4-48 UNF0.1120.22
5-40 UNC0.1250.25
5-44 UNF0.1250.25
6-32 UNC0.1380.28
6-40 UNF0.1380.28
8-32 UNC0.1640.33
8-36 UNF0.1640.33
10-24 UNC0.1900.38
10-32 UNF0.1900.38
1/4-20 UNC0.2500.50
1/4-28 UNF0.2500.50
5/16-18 UNC0.3130.675
5/16-24 UNF0.3130.675
3/8-16 UNC0.3750.75
3/8-24 UNF0.3750.75
7/16-14 UNC0.4380.875
7/16-20 UNF0.4380.875
1/2-13 UNC0.5001.00
1/2-20 UNF0.5001.00
9/16-12 UNC0.5631.25
9/16-18 UNF0.5631.25
5/8-11 UNC0.6251.25
5/8-18 UNF0.6251.25
3/4-10 UNC0.7501.50
3/4-16 UNF0.7501.50
7/8-9 UNC0.8752.00
7/8-14 UNF0.8752.00
1″-8 UNC1.0002.50
1″-12 UNF1.0002.50
MetricBoss Diameter (in)Max Thread Length (in)
M2x0.40.0790.276
M2.5×0.450.0980.276
M3x0.50.1180.276
M3.5×0.60.1380.276
M4x0.70.1570.500
M5x0.80.1970.500
M6x1.00.2360.500
M8x1.250.3150.500
M10x1.50.3941.000
M12x1.750.4721.000
M14x2.00.5511.500
M16x2.50.6301.500
M24x3.00.9452.000

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