标准系列的美制航空航天外螺纹的极限尺寸           in

公称直径

-牙数

系列

标记

外   螺   纹

公差带

大  径

中  径

小  径

max

min

max

min

max

min

1.7500-5

UNJC

2A

3A

1.7473

1.7500

1.7268

1.7295

1.6174

1.6201

1.6085

1.6134

1.5164

1.5191

1.4953

1.5002

1.7500-8

UNJ

2A

3A

1.7477

1.7500

1.7327

1.7350

1.6665

1.6688

1.6590

1.6631

1.6034

1.6056

1.5883

1.5924

1.7500-12

UNJ

2A

3A

1.7482

1.7500

1.7368

1.7386

1.6941

1.6959

1.6881

1.6914

1.6520

1.6538

1.6410

1.6442

1.7500-16

UNJ

2A

3A

1.7484

1.7500

1.7390

1.7406

1.7078

1.7094

1.7025

1.7054

1.6762

1.6778

1.6671

1.6700

1.8125-8

UNJ

2A

3A

1.8102

1.8125

1.7952

1.7975

1.7290

1.7313

1.7214

1.7256

1.6658

1.6682

1.6507

1.6549

1.8125-12

UNJ

2A

3A

1.8107

1.8125

1.7993

1.8011

1.7566

1.7584

1.7506

1.7539

1.7145

1.7163

1.7034

1.7068

1.8125-16

UNJ

2A

3A

1.8109

1.8125

1.8015

1.8031

1.7703

1.7719

1.7650

1.7679

1.7387

1.7403

1.7296

1.7325

1.8750-8

UNJ

2A

3A

1.8727

1.8750

1.8577

1.8600

1.7915

1.7938

1.7838

1.7881

1.7284

1.7306

1.7131

1.7174

1.8750-12

UNJ

2A

3A

1.8732

1.8750

1.8618

1.8636

1.8191

1.8209

1.8131

1.8164

1.7770

1.7788

1.7660

1.7692

1.8750-16

UNJ

2A

3A

1.8734

1.8750

1.8640

1.8656

1.8328

1.8344

1.8275

1.8304

1.8012

1.8028

1.7921

1.7950

1.9375-8

UNJ

2A

3A

1.9352

1.9375

1.9202

1.9225

1.8540

1.8563

1.8463

1.8505

1.7908

1.7932

1.7756

1.7798

1.9375-12

UNJ

2A

3A

1.9357

1.9375

1.9243

1.9261

1.8816

1.8834

1.8755

1.8789

1.8395

1.8413

1.8284

1.8318

1.9375-16

UNJ

2A

3A

1.9359

1.9375

1.9265

1.9281

1.8953

1.8969

1.8899

1.8929

1.8637

1.8653

1.8545

1.8575

2.0000-4.5

UNJC

2A

3A

1.9971

2.0000

1.9751

1.9780

1.8528

1.8557

1.8433

1.8486

1.7405

1.7434

1.7176

1.7229

2.0000-8

UNJ

2A

3A

1.9977

2.0000

1.9827

1.9850

1.9165

1.9188

1.9087

1.9130

1.8534

1.8556

1.8380

1.8423

2.0000-12

UNJ

2A

3A

1.9982

2.0000

1.9868

1.9886

1.9441

1.9459

1.9380

1.9414

1.9020

1.9038

1.8908

1.8942

2.0000-16

UNJ

2A

3A

1.9984

2.0000

1.9890

1.9906

1.9578

1.9594

1.9524

1.9554

1.9262

1.9278

1.9170

1.9200

2.1250-8

UNJ

2A

3A

2.1226

1.1250

2.1076

2.1100

2.0414

2.0438

2.0335

2.0379

1.9782

1.9806

1.9628

1.9672

2.1250-12

UNJ

2A

3A

2.1232

2.1250

2.1118

2.1136

2.0691

2.0709

2.0630

2.0664

2.0270

2.0288

2.0158

2.0192

2.1250-16

UNJ

2A

3A

2.1234

2.1250

2.1140

2.1156

2.0828

2.0844

2.0774

2.0804

2.0512

2.0528

2.0420

2.0450

2.2500-4.5

UNJC

2A

3A

2.2471

2.2500

2.2251

2.2280

2.1028

2.1057

2.0931

2.0984

1.9905

1.9934

1.9674

1.9727

2.2500-8

UNJ

2A

3A

2.2476

2.2500

2.2326

2.2350

2.1664

2.1688

2.1584

2.1628

2.1032

2.1056

2.0877

2.0921

2.2500-12

UNJ

2A

3A

2.2482

2.2500

2.2368

2.2386

2.1941

2.1959

2.1880

2.1914

2.1520

2.1538

2.1408

2.1442

2.2500-16

UNJ

2A

3A

2.2484

2.2500

2.2390

2.2406

2.2078

2.2094

2.2024

2.2054

2.1762

2.1778

2.1670

2.1700

2.3750-8

UNJ

2A

3A

2.3726

2.3750

2.3576

2.3600

2.2914

2.2938

2.2833

2.2878

2.2282

2.2306

2.2126

2.2171

2.3750-12

UNJ

2A

3A

2.3731

2.3750

2.3617

2.3636

2.3190

2.3209

2.3128

2.3163

2.2769

2.2788

2.2656

2.2692

2.3750-16

UNJ

2A

3A

2.3733

2.3750

2.3639

2.3656

2.3327

2.3344

2.3272

2.3303

2.3011

2.3028

2.2918

2.2949

2.5000-4

UNJC

2A

3A

2.4969

2.5000

2.4731

2.4762

2.3345

2.3376

2.3241

2.3298

2.2082

2.2113

2.1826

2.1883

2.5000-8

UNJ

2A

3A

2.4976

2.5000

2.4826

2.4850

2.4164

2.4188

2.4082

2.4127

2.3532

2.3556

2.3375

2.3420

2.5000-12

UNJ

2A

3A

2.4981

2.5000

2.4867

2.4886

2.4440

2.4459

2.4378

2.4413

2.4019

2.4038

2.3906

2.3942

2.5000-16

UNJ

2A

3A

2.4983

2.5000

2.4889

2.4906

2.4577

2.4594

2.4522

2.4553

2.4261

2.4278

2.4168

2.4199

2.6250-8

UNJ

2A

3A

2.6225

2.6250

2.6075

2.6100

2.5413

2.5438

2.5331

2.5376

2.4782

2.4806

2.4624

2.4669

2.6250-12

UNJ

2A

3A

2.6231

2.6250

2.6117

2.6136

2.5690

2.5709

2.5628

2.5663

2.5269

2.5288

2.5156

2.5192

2.6250-16

UNJ

2A

3A

2.6233

2.6250

2.6139

2.6156

2.5827

2.5844

2.5772

2.5803

2.5511

2.5528

2.5418

2.5449

2.7500-4

UNJC

2A

3A

2.7468

2.7500

2.7230

2.7262

2.5844

2.5876

2.5739

2.5797

2.4581

2.4613

2.4324

2.4382

2.7500-8

UNJ

2A

3A

2.7475

2.7500

2.7325

2.7350

2.6663

2.6688

2.6580

2.6625

2.6032

2.6056

2.5873

2.5918

2.7500-12

UNJ

2A

3A

2.7481

2.7500

2.7367

2.7386

2.6940

2.6959

2.6878

2.6913

2.6519

2.6538

2.6406

2.6442

2.7500-16

UNJ

2A

3A

2.7483

2.7500

2.7389

2.7406

2.7077

2.7094

2.7022

2.7053

2.6761

2.6778

2.6668

2.6699

2.8750-8

UNJ

2A

3A

2.8725

2.8750

2.8575

2.8600

2.7913

2.7938

2.7829

2.7875

2.7282

2.7306

2.7122

2.7168

2.8750-12

UNJ

2A

3A

2.8731

2.8750

2.8617

2.8636

2.8190

2.8209

2.8127

2.8162

2.7769

2.7788

2.7655

2.7690

2.8750-16

UNJ

2A

3A

2.8733

2.8750

2.8639

2.8656

2.8327

2.8344

2.8271

2.8302

2.8011

2.8028

2.7917

2.7948

3.0000-4

UNJC

2A

3A

2.9968

3.0000

2.9730

2.9762

2.8344

2.8376

2.8237

2.8296

2.7081

2.7113

2.6822

2.6882

3.0000-8

UNJ

2A

3A

2.9974

3.0000

2.9824

2.9850

2.9162

2.9188

2.9077

2.9124

2.8531

2.8556

2.8370

2.8417

3.0000-12

UNJ

2A

3A

2.9981

3.0000

2.9867

2.9886

2.9440

2.9459

2.9377

2.9412

2.9019

2.9038

2.8905

2.8940

3.0000-16

UNJ

2A

3A

2.9983

3.0000

2.9889

2.9906

2.9577

2.9594

2.9521

2.9552

2.9261

2.9278

2.9167

2.9198

3.1250-8

UNJ

2A

3A

3.1224

3.1250

3.1074

3.1100

3.0412

3.0438

3.0326

3.0374

2.9781

2.9806

2.9619

2.9667

3.1250-12

UNJ

2A

3A

3.1231

3.1250

3.1117

3.1136

3.0690

3.0709

3.0627

3.0662

3.0269

3.0288

3.0155

3.0190

3.1250-16

UNJ

2A

3A

3.1233

3.1250

3.1139

3.1156

3.0827

3.0844

3.0771

3.0802

3.0511

3.0528

3.0417

3.0448

3.2500-4

UNJC

2A

3A

3.2467

3.2500

3.2229

3.2262

3.0843

3.0876

3.0734

3.0794

2.9580

3.9613

2.9320

2.9379

3.2500-8

UNJ

2A

3A

3.2474

3.2500

3.2324

3.2350

3.1662

3.1688

3.1575

3.1623

3.1031

3.1056

3.0868

3.0916

3.2500-12

UNJ

2A

3A

3.2481

3.2500

3.2367

3.2386

3.1940

3.1959

3.1877

3.1912

3.1519

3.1538

3.1405

3.1440

3.2500-16

UNJ

2A

3A

3.2483

3.2500

3.2389

3.2406

3.2077

3.2094

3.2021

3.2052

3.1761

3.1778

3.1667

3.1698

3.3750-8

UNJ

2A

3A

3.3724

3.3750

3.3574

3.3600

3.2912

3.2938

3.2824

3.2872

3.2281

3.2306

3.2117

3.2165

3.3750-12

UNJ

2A

3A

3.3731

3.3750

3.3617

3.3636

3.3190

3.3209

3.3126

3.3161

3.2769

3.2788

3.2654

3.2689

3.3750-16

UNJ

2A

3A

3.3733

3.3750

3.3639

3.3656

3.3327

3.3344

3.3269

3.3301

3.3011

3.3028

3.2915

3.2947

3.5000-4

UNJC

2A

3A

3.4967

3.5000

3.4729

3.4762

3.3343

3.3376

3.3233

3.3293

3.2080

3.2113

3.1818

3.1878

3.5000-8

UNJ

2A

3A

3.4974

3.5000

3.4824

3.4850

3.4162

3.4188

3.4074

3.4122

3.3530

3.3556

3.3367

3.3415

3.5000-12

UNJ

2A

3A

3.4981

3.5000

3.4867

3.4886

3.4440

3.4459

3.4376

3.4411

3.4019

3.4038

3.3904

3.3940

3.5000-16

UNJ

2A

3A

3.4983

3.5000

3.4889

3.4906

3.4577

3.4594

3.4519

3.4551

3.4261

3.4278

3.4165

3.4197

3.6250-8

UNJ

2A

3A

3.6223

3.6250

3.6073

3.6100

3.5411

3.5438

3.5322

3.5371

3.4780

3.4806

3.4615

3.4664

3.6250-12

UNJ

2A

3A

3.6231

3.6250

3.6117

3.6136

3.5690

3.5709

3.5626

3.5661

3.5269

3.5288

3.5154

3.5190

3.6250-16

UNJ

2A

3A

3.6233

3.6250

3.6139

3.6156

3.5827

3.5844

3.5769

3.5801

3.5511

3.5528

3.5415

3.5447

3.7500-4

UNJC

2A

3A

3.7466

3.7500

3.7228

3.7262

3.5842

3.5876

3.5730

3.5792

3.4579

3.4613

3.4316

3.4378

3.7500-8

UNJ

2A

3A

3.7473

3.7500

3.7323

3.7350

3.6661

3.6688

3.6571

3.6621

3.6030

3.6056

3.5864

3.5914

3.7500-12

UNJ

2A

3A

3.7481

3.7500

3.7367

3.7386

3.6940

3.6959

3.6876

3.6911

3.6519

3.6538

3.6404

3.6440

3.7500-16

UNJ

2A

3A

3.7483

3.7500

3.7389

3.7406

3.7077

3.7094

3.7019

3.7051

3.6761

3.6778

3.6665

3.6697

3.8750-8

UNJ

2A

3A

3.8723

3.8750

3.8573

3.8600

3.7911

3.7938

3.7820

3.7870

3.7280

3.7306

3.7113

3.7163

3.8750-12

UNJ

2A

3A

3.8730

3.8750

3.8616

3.8636

3.8189

3.8209

3.8124

3.8160

3.7768

3.7788

3.7652

3.7688

3.8750-16

UNJ

2A

3A

3.8732

3.8750

3.8638

3.8656

3.8326

3.8344

3.8267

3.8300

3.8010

3.8028

3.7913

3.7946

4.0000-4

UNJC

2A

3A

3.9966

4.0000

3.9728

3.9762

3.8342

3.8376

3.8229

3.8291

3.7079

3.7113

3.6815

3.6876

4.0000-8

UNJ

2A

3A

3.9973

4.0000

3.9823

3.9850

3.9161

3.9188

3.9070

3.9120

3.8530

3.8556

3.8363

3.8413

4.0000-12

UNJ

2A

3A

3.9980

4.0000

3.9866

3.9886

3.9439

3.9459

3.9374

3.9410

3.9018

3.9038

3.8902

3.8938

4.0000-16

UNJ

2A

3A

3.9982

4.0000

3.9888

3.9906

3.9576

3.9594

3.9517

3.9550

3.9260

3.9278

3.9183

3.9196

4.1250-12

UNJ

2A

3A

4.1230

4.1250

4.1116

4.1136

4.0689

4.0709

4.0624

4.0660

4.0268

4.0288

4.0152

4.0188

4.1250-16

UNJ

2A

3A

4.1232

4.1250

4.1138

4.1156

4.0826

4.0844

4.0767

4.0800

4.0510

4.0528

4.0413

4.0446

4.2500-12

UNJ

2A

3A

4.2480

4.2500

4.2366

4.2386

4.1939

4.1959

4.1874

4.1910

4.1518

4.1538

4.1402

4.1438

4.2500-16

UNJ

2A

3A

4.2482

4.2500

4.2388

4.2406

4.2076

4.2094

4.2017

4.2050

4.1760

4.1778

4.1663

4.1696

4.3750-12

UNJ

2A

3A

4.3730

4.3750

4.3616

4.3636

4.3189

4.3209

4.3124

4.3160

4.2768

4.2788

4.2652

4.2688

4.3750-16

UNJ

2A

3A

4.3732

4.3750

4.3638

4.3656

4.3326

4.3344

4.3267

4.3300

4.3010

4.3028

4.2913

4.2946

4.5000-12

UNJ

2A

3A

4.4980

4.5000

4.4866

4.4886

4.4439

4.4459

4.4374

4.4410

4.4018

4.4038

4.3902

4.3938

4.5000-16

UNJ

2A

3A

4.4982

4.5000

4.4888

4.4906

4.4576

4.4594

4.4517

4.4550

4.4260

4.4278

4.4163

4.4196

4.6250-12

UNJ

2A

3A

4.6230

4.6250

4.6116

4.6136

4.5689

4.5709

4.5622

4.5659

4.5268

4.5288

4.5150

4.5187

4.6250-16

UNJ

2A

3A

4.6232

4.6250

4.6138

4.6156

4.5826

4.5844

4.5765

4.5799

4.5510

4.5528

4.5411

4.5445

4.7500-12

UNJ

2A

3A

4.7480

4.7500

4.7366

4.7386

4.6939

4.6959

4.6872

4.6909

4.6518

4.6538

4.6400

4.6437

4.7500-16

UNJ

2A

3A

4.7482

4.7500

4.7388

4.7406

4.7076

4.7094

4.7015

4.7049

4.6760

4.6778

4.6661

4.6695

4.8750-12

UNJ

2A

3A

4.8730

4.8750

4.8616

4.8636

4.8189

4.8209

4.8122

4.8159

4.7768

4.7788

4.7650

4.7687

4.8750-16

UNJ

2A

3A

4.8732

4.8750

4.8638

4.8656

4.8326

4.8344

4.8265

4.8299

4.8010

4.8028

4.7911

4.7945

5.0000-12

UNJ

2A

3A

4.9980

5.0000

4.9866

4.9886

4.9439

4.9459

4.9372

4.9409

4.9018

4.9038

4.8900

4.8937

5.0000-16

UNJ

2A

3A

4.9982

5.0000

4.9888

4.9906

4.9576

4.9594

4.9515

4.9549

4.9260

4.9278

4.9161

4.9195

5.1250-12

UNJ

2A

3A

5.1230

5.1250

5.1116

5.1136

5.0689

5.0709

5.0622

5.0659

5.0268

5.0288

5.0150

5.0187

5.1250-16

UNJ

2A

3A

5.1232

5.1250

5.1138

5.1156

5.0826

5.0844

5.0765

5.0799

5.0510

5.0528

5.0411

5.0445

5.2500-12

UNJ

2A

3A

5.2480

5.2500

5.2366

5.2386

5.1939

5.1959

5.1872

5.1909

5.1518

5.1538

5.1400

5.1437

5.2500-16

UNJ

2A

3A

5.2482

5.2500

5.2388

5.2406

5.2076

5.2094

5.2015

5.2049

5.1760

5.1778

5.1661

5.1695

5.3750-12

UNJ

2A

3A

5.3730

5.3750

5.3616

5.3636

5.3189

5.3209

5.3122

5.3159

5.2768

5.2788

5.2650

5.2687

5.3750-16

UNJ

2A

3A

5.3732

5.3750

5.3638

5.3656

5.3326

5.3344

5.3265

5.3299

5.3010

5.3028

5.2911

5.2945

5.5000-12

UNJ

2A

3A

5.4980

5.5000

5.4866

5.4886

5.4439

5.4459

5.4372

5.4409

5.4018

4.4038

5.3900

5.3937

5.5000-16

UNJ

2A

3A

5.4982

5.5000

5.4888

5.4906

5.4576

5.4594

5.4515

5.4549

5.4260

5.4278

5.4161

4.4195

5.6250-12

UNJ

2A

3A

5.6229

5.6250

5.6115

5.6136

5.5688

5.5709

5.5619

5.5657

5.5267

5.5288

5.5148

5.5185

5.6250-16

UNJ

2A

3A

5.6231

5.6250

5.6137

5.6156

5.5825

5.5844

5.5763

5.5797

5.5509

5.5528

5.5409

5.5443

5.7500-12

UNJ

2A

3A

5.7479

5.7500

5.7365

5.7386

5.6938

5.6959

5.6869

5.6907

5.6517

5.6538

5.6398

5.6435

5.7500-16

UNJ

2A

3A

5.7481

5.7500

5.7387

8.7406

5.7075

5.7094

5.7013

5.7047

5.6759

5.6778

5.6659

5.6693

5.8750-12

UNJ

2A

3A

5.8729

5.8750

5.8615

5.8636

5.8188

5.8209

5.8119

5.8157

5.7767

5.7788

5.7648

5.7685

5.8750-16

UNJ

2A

3A

5.8731

5.8750

5.8637

5.8656

5.8325

5.8344

5.8263

8.8297

5.8009

5.8028

5.7909

5.7943

6.0000-12

UNJ

2A

3A

5.9979

6.0000

5.9865

5.9886

5.9438

8.9459

5.9369

8.9407

5.9017

5.9038

5.8898

5.8935

6.0000-16

UNJ

2A

3A

5.9981

6.0000

5.9887

5.9906

5.9575

5.9594

5.9513

5.9547

5.9259

5.9278

5.9159

5.9193