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Bolt and Nut Dimensions

Stud
Bolt
Size

Thread Dimensions

Nut Dimensions

Threads
Per Inch

Root
Area

Across
Flats

Across
Corners

Nom.
Thick.

1/2

13

0.126

0.875

0.969

0.484

5/8

11

0.202

1.063

1.175

0.609

3/4

10

0.302

1.250

1.383

0.734

7/8

9

0.419

1.438

1.589

0.859

1

8

0.551

1.625

1.796

0.984

1 1/8

8

0.728

1.813

2.002

1.109

1 1/4

8

0.929

2.000

2.209

1.219

1 3/8

8

1.155

2.188

2.416

1.344

1 1/2

8

1.405

2.375

2.622

1.469

1 5/8

8

1.680

2.563

2.828

1.594

1 3/4

8

1.980

2.750

3.035

1.719

1 7/8

8

2.300

2.938

3.242

1.844

2

8

2.650

3.125

3.449

1.969

2 1/4

8

3.420

3.500

3.862

2.203

2 1/2

8

4.290

3.875

4.275

2.453

2 3/4

8

5.260

4.250

4.688

2.703

3

8

6.320

4.625

5.102

2.953

3 1/4

8

7.490

5.000

5.515

3.188

3 1/2

8

8.750

5.375

5.928

3.438

3 3/4

8

10.110

5.750

6.341

3.688

4

8

11.570

6.125

6.755

3.938

Calculation of "Nut Stop Diameter"
Nut Stop Diameter = Bolt Circle Diameter - Nut Dimension Across Flats
Example:
Determine nut stop diameter of a 16" - 300# RF Equal Barrel 'E' connection

DESIGN DATA
Bolt Circle Diameter = 22.50 inches (ref. 16" - 300# RF flange bolt circle)
Stud Bolt Size = 1.25 inches (ref. 16" - 300# RF flange)
Nut Dimension Across Flats = 2.00 inches (ref. above chart for nut dimension relating to stud bolt size)

Nut Stop Diameter = Bolt Circle Diameter - Nut Dimension Across Flats
Nut Stop Diameter = 22.50 - 2.00 = 20.50 in.

NOTE:
Technical data contained in this section governed by ASME or other Codes/Specifications are subject to change and are therefore provided for information purposes only and are not to be used for design purposes. Refer to latest edition of applicable Code/Specification and addendums thereto for required design data.