Dimensions of Commonly used UNC and UNF Bolt Sizes

High-Performance Pipe and Bolt Threading Machine Options

Oster’s industrial-grade pipe and bolt threading machines include an extensive selection of heavy-duty threading machines. We also manufacture a high-performance dark thread cutting oil to ensure your threading machine works efficiently and effectively.

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Size

Threads Per Inch

Class Thread

Major Diameter

Min

Max

Pitch Diameter

Min

Max

Minor Diameter

1/4

20

2A

0.2489

0.2408

0.2164

0.2127

0.1876

28

2A

0.2490

0.2425

0.2258

0.2225

0.2052

5/16

18

2A

0.3113

0.3026

0.2752

0.2712

0.2431

24

2A

0.3114

0.3042

0.2843

0.2806

0.2603

3/8

16

2A

0.3737

0.3643

0.3331

0.3287

0.2970

24

2A

0.3739

0.3667

0.3468

0.3430

0.3228

7/16

14

2A

0.4361

0.4258

0.3897

0.3850

0.3485

20

2A

0.4362

0.4281

0.4237

0.3995

0.3749

1/2

13

2A

0.4985

0.4876

0.4485

0.4435

0.4041

20

2A

0.4987

0.4906

0.4662

0.4619

0.4374

9/16

12

2A

0.5609

0.5495

0.5068

0.5016

0.4587

18

2A

0.5611

0.5524

0.5250

0.5205

0.4929

5/8

11

2A

0.6234

0.6113

0.5644

0.5589

0.5119

18

2A

0.6236

0.6149

0.5875

0.5828

0.5449

3/4

10

2A

0.7482

0.7353

0.6832

0.6773

0.6255

16

2A

0.7485

0.7391

0.7079

0.7029

0.6718

7/8

9

2A

0.8731

0.8592

0.8009

0.7946

0.7368

14

2A

0.8734

0.8631

0.8270

0.8216

0.7858

1

8

2A

0.9980

0.9830

0.9168

0.9100

0.8446

12

2A

0.9982

0.9868

0.9441

0.9382

0.8960

NC Thread Profiles

Unified

Unified NC Thread Profiles

American National

American National

 

Let Us Answer Your Custom Applications or Technical Questions

Get technical support from pipe and bolt threading machine experts. When you call Oster Manufacturing there is always a human being on the other end of the line. We have skilled technicians and sales experts on hand to take your call.

If you’re interested in a machine or tooling for a non-standard threading application, we are happy to consult with you on the project. We can create custom engineered solutions to make your project idea a reality. We also manufacture a variety of custom tooling for special projects and keep them in stock for you. Never wait for tooling for a difficult project again.

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