Nominal Nut
Size, In.and
Pitch

Diametral
Allowance,
in.A

Pitch Diametral, in.

Min

Max

0.250 - 20

0.016

0.2335

0.2384

0.312 - 18

0.017

0.2931

0.2987

0.375 - 16

0.017

0.3514

0.3571

0.437 - 14

0.018

0.4091

0.4152

0.500 - 13

0.018

0.4680

0.4745

0.0562 - 12

0.020

0.5284

0.5352

0.625 - 11

0.020

0.5860

0.5932

0.750 - 10

0.020

0.7050

0.7127

0.875 - 9

0.022

0.8248

0.8330

1.000 - 8

0.024

0.9428

0.9516

1.125 - 8

0.024

1.0678

1.0768

1.125 - 7

0.024

1.0562

1.0656

1.250 - 8

0.024

1.1928

1.2020

1.250 - 7

0.024

1.1812

1.1908

1.375 - 8

0.027

1.3208

1.3301

1.375 - 6

0.027

1.2937

1.3041

l.500 - 8

0.027

1.4458

1.4553

1.500 - 6

0.027

1.4187

1.4292

1.750 - 5

0.050

1.6701

1.6817

2.C00 - 4.5

0.050

1.9057

1.9181

2.250 - 4.5

0.050

2.1557

2.1683

2.500 - 4

0.050

2.3876

2.4011

2.750 - 4

0.050

2.6376

2.6513

3.000 - 4

0.050

2.8876

2.9015

3.250 - 4

0.050

3.1376

3.1517

3.500 - 4

0.050

3.3876

3.4019

3.750 - 4

0.050

3.6376

3.6521

4.000 - 4

0.050

3.8876

3.9023