UN Working Thread Plug Gage Pitch Diameters

#0 - 80 UNF

#1 - 64 UNC

.0629

.0655

.0648

#1 - 72 UNF

.0640

.0665

.0659

#2 - 56 UNC

.0744

.0772

.0765

#2 - 64 UNF

.0759

.0786

.0779

#3 - 48 UNC

.0855

.0885

.0877

#3 - 56 UNF

.0874

.0902

.0895

#4 - 40 UNC

.0958

.0991

.0982

#4 - 48 UNF

.0985

.1016

.1008

#5 - 40 UNC

.1088

.1121

.1113

#5 - 44 UNF

.1102

.1134

.1126

#6 - 32 UNC

.1177

.1214

.1204

#6 - 40 UNF

.1218

.1252

.1243

#8 - 32 UNC

.1437

.1475

.1465

#8 - 36 UNF

.1460

.1496

.1487

#10 - 24 UNC

.1629

.1672

.1661

#10 - 32 UNF

.1697

.1736

.1726

#12 - 24 UNC

.1889

.1933

.1922

#12 - 28 UNF

.1928

.1970

.1959

#12 - 32 UNEF

.1957

.1998

.1988

1/4 - 20 UNC

.2175

.2224

.2211

1/4 - 28 UNF

.2268

.2311

.2300

1/4 - 32 UNEF

.2297

.2339

.2328

5/16 - 18 UNC

.2764

.2817

.2803

5/16 - 24 UNF

.2854

.2902

.2890

5/16 - 32 UNEF

.2922

.2964

.2953

3/8 - 16 UNC

.3344

.3401

.3387

3/8 - 24 UNF

.3479

.3528

.3516

3/8 - 32 UNEF

.3547

.3591

.3580

7/16 - 14 UNC

.3911

.3972

.3957

7/16 - 20 UNF

.4050

.4104

.4091

7/16 - 28 UNEF

.4143

.4189

.4178

1/2 - 13 UNC

.4500

.4565

.4548

1/2 - 20 UNF

.4675

.4731

.4717

1/2 - 28 UNEF

.4768

.4816

.4804

9/16 - 12 UNC

.5084

.5152

.5135

9/16 - 18 UNF

.5264

.5323

.5308

9/16 - 24 UNEF

.5354

.5405

.5392

5/8 - 11 UNC

.5660

.5732

.5714

5/8 - 18 UNF

.5889

.5949

.5934

5/8 - 24 UNEF

.5979

.6031

.6018

11/16 - 24 UNEF

.6604

.6656

.6643

3/4 - 10 UNC

.6850

.6927

.6907

3/4 - 16 UNF

.7094

.7159

.7143

3/4 - 20 UNEF

.7175

.7232

.7218

13/16 - 20 UNEF

.7800

.7857

.7843

7/8 - 9 UNC

.8028

.8110

.8089

7/8 - 14 UNF

.8286

.8356

.8339

7/8 - 20 UNEF

.8425

.8482

.8468

15/16 - 20 UNEF

.9050

.9109

.9094

1" - 8 UNC

.9188

.9276

.9254

1" - 12 UNF

.9459

.9535

.9516

1" - 14 UNS

.9536

.9609

.9590

1" - 20 UNEF

.9675

.9734

.9719

1 1/16 - 12 UN

1.0084

1.0158

1.0139

1 1/16 - 18 UNEF

1.0264

1.0326

1.0310

1 1/8 - 7 UNC

1.0322

1.0416

1.0393

1 1/8 - 12 UNF

1.0709

1.0787

1.0768

1 1/8 - 18 UNEF

1.0889

1.0951

1.0935

1 3/16 - 12 UN

1.1334

1.1409

1.1390

1 3/16 - 18 UNEF

1.1514

1.1577

1.1561

1 1/4 - 7 UNC

1.1572

1.1668

1.1644

1 1/4 - 12 UNF

1.1959

1.2039

1.2019

1 1/4 - 18 UNEF

1.2139

1.2202

1.2186

1 5/16 - 12 UN

1.2584

1.2659

1.2640

1 5/16 - 18 UNEF

1.2764

1.2827

1.2811

1 3/8 - 6 UNC

1.2667

1.2771

1.2745

1 3/8 - 12 UNF

1.3209

1.3291

1.3270

1 3/8 - 18 UNEF

1.3389

1.3452

1.3436

1 7/16 - 12 UN

1.3834

1.3910

1.3891

1 7/16 - 18 UNEF

1.4014

1.4079

1.4062

1 1/2 - 6 UNC

1.3917

1.4022

1.3996

1 1/2 - 12 UNF

1.4459

1.4542

1.4522

1 1/2 - 18 UNEF

1.4639

1.4704

1.4687