British Standard Cycle Thread Chart (BSC - CEI)

Thread Angle 60 degrees

OD

Decimal

TPI

Pitch

Core Dia

Thread
Depth

Radius

Hex
A/Flats

Head
Depth

Washer
Face
Dia

Standard
Nut
Depth

Lock
Nut
Depth

Tapping
Size

MM

Letter
or
Number

17 swg RH

0.056

56
or
62

0.0179
-
0.0161

0.0370
-
0.0388

0.0095
-
0.0086

0.0030

0.039
-
0.042

1
-
1.1

61
-
57

16 swg RH

0.064

56
or
62

0.0179
-
0.0161

0.0388
-
0.0468

0.0095
-
0.0086

0.0030

0.0390
-
0.0469

1
-
1.2

61
-
3/64

15 swg RH

0.072

56
or
62

0.0179
-
0.0161

0.0545
-
0.0598

0.0095
-
0.0086

0.0030

0.0550
-
0.0625

1.4
-
1.6

54
-
1/16

14 swg RH

0.080

56
or
62

0.0179
-
0.0161

0.061
-
0.0628

0.0095
-
0.0086

0.0030

0.0630
-
0.0630
-

1.6
-
1.6

1/16
-
52

13 swg RH

0.092

56

0.0179

0.0730

0.0095

0.0030

0.0748

1.9

48

12 swg RH

0.104

44

0.0227

0.0798

0.0095

0.0030

0.081

2.1

46

11 swg RH

0.116

44

0.0227

0.0945

0.0121

0.0030

0.096

2.5

41

1/8 RH

0.125

40

0.0250

0.0984

0.0133

0.0041

0.0995

2.5

39

10 swg RH

0.1280

44

0.0227

0.1039

0.0121

0.0038

0.1063

2.7

36

9 swg RH

0.144

40

0.0250

0.1147

0.0133

0.0041

0.1160

3.0

32

5/32 RH

0.1562

32

0.0312

0.1231

0.0166

0.0052

0.1285

3.2

30

8 swg RH

0.160

40

0.0250

0.1334

0.0133

0.0041

0.1360

3.5

29

7 swg RH

0.1766

32

0.0312

0.1434

0.0166

0.0052

0.1440

3.7

27

3/16 RH

0.1875

32

0.0312

0.1543

0.0166

0.0052

0.338

0.1562

4.0

5/32

7/32 RH

0.2188

26

0.0385

0.1778

0.0205

0.0064

0.1800

4.6

15

1/4 RH

0.250

26

0.0385

0.2091

0.0205

0.0064

0.445

0.176

0.428

0.200

0.185

0.213

5.4

3

17/64 RH

0.2656

26

0.0385

0.2246

0.0205

0.0064

0.2280

5.8

1

9/32 RH

0.2813

26

0.0385

0.2403

0.0205

0.0064

0.2420

6.2

C

5/16 RH

0.3125

26

0.0385

0.2715

0.0205

0.0064

0.525

0.218

0.508

0.250

0.210

0.275

7

J

3/8 RH

0.375

26

0.0385

0.3340

0.0205

0.0064

0.600

0.260

0.582

0.312

0.260

0.3390

8.6

R

OD

Decimal

TPI

Pitch

Core Dia

Thread
Depth

Radius

Hex
A/Flats

Head
Depth

Washer
Face
Dia

Standard
Nut
Depth

Lock
Nut
Depth

Tapping
Size

MM

Letter
or
Number

7/16 RH

0.4375

26

0.0385

0.3965

0.0205

0.0064

0.710

0.302

0.690

0.375

0.275

0.3970

10.1

X

7/16 RH

0.4375

20

0.0500

0.3843

0.0266

0.0083

0.710

0.302

0.690

0.375

0.275

0.386

9.8

W

1/2 RH

0.500

26

0.0385

0.4590

0.0205

0.0064

0.820

0.343

0.800

0.437

0.300

0.4688

11.7

15/32

1/2 RH

0.500

20

0.0500

0.4468

0.0266

0.0083

0.820

0.343

0.800

0.437

0.300

0.4528

11.5

29/64

9/16 RH

0.5625

26

0.0385

0.5215

0.0205

0.0064

0.900

0.375

0.900

0.500

0.333

0.5313

13.3

17/32

9/16 RH

0.5625

20

0.0500

0.5093

0.0266

0.0083

0.900

0.375

0.900

0.500

0.333

0.5118

13.0

33/64

5/8 RH

0.625

26

0.0385

0.5840

0.0205

0.0064

1.010

0.417

0.985

0.562

0.375

0.5905

15.0

19/32

5/8 RH

0.625

20

0.0500

0.5718

0.0266

0.0083

1.010

0.417

0.985

0.562

0.375

0.578

14.6

37/64

11/16 RH

0.6875

26

0.0385

0.6465

0.0205

0.0064

0.6496

16.5

21/32

11/16 RH

0.6875

20

0.0500

0.6343

0.0266

0.0083

0.6406

16.2

41/64

3/4 RH

0.750

26

0.0385

0.7091

0.0205

0.0064

1.200

0.500

1.175

0.687

0.458

0.712

18.1

23/32

3/4 RH

0.750

20

0.0500

0.6968

0.0266

0.0083

1.200

0.500

1.175

0.687

0.458

0.7031

17.7

45/64

7/8 RH

0.875

24

0.0417

0.8306

0.0222

0.0070

1.300

0.583

1.273

0.750

0.500

0.8370

21.1

27/32

31/32 RH

0.9688

30

0.0333

0.9332

0.0178

0.0055

0.937

23.8

15/16

1 inch RH

1.000

24
-
26

0.0417
-
0.0385

0.9556
-
0.9590

0.0222
-
0.0205

0.0070
-
0.0064

1.480

0.666
-
0.666

1.453

0.875

0.583

0.9688

24.3
-
24.4

31/32

1 - 1/8 RH

1.125

26

0.0385

1.0840

0.0205

0.0064

1.670

0.750

1.620

1.000

0.666

1.0937

27.6

1 - 3/32

1.29 LH

1.290

24

0.0417

1.2456

0.0222

0.0070

1.250

31.7

1 - 1/4

1 - 3/8 RH

1.370

24

0.0417

1.3256

0.0222

0.0070

2.050

0.920

1.985

1.250

0.833

1.3281

33.7

1 - 21/64

1 - 3/8 LH

1.370

24

0.0417

1.3256

0.0222

0.0070

2.050

0.920

1.985

1.250

0.833

1.3281

33.7

1 - 21.64

1.45 RH

1.450

26

0.0385

1.4090

0.0205

0.0064

2.220

1.000

2.155

1.375

0.916

1.4218

35.8

1 - 27/64

1.45 LH

1.450

26

0.0385

1.4090

0.0205

0.0064

2.220

1.000

2.155

1.375

0.916

1.4218

35.8

1 - 27/64

1 - 9/16 LH

1.562

24

0.0417

1.5176

0.0222

0.0070

1.5312

38.6

1 - 17/32

1 - 5/8 RH

1.625

24

0.0417

1.5806

0.0222

0.0070

1.5937

38.4

1 - 19/32

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