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WHITWORTH THREAD ACCORDING TO BSI STANDARD BS 84:1956
Calculate in
Inch
Millimeter
Diameter and number of threads per inch
1/16 - 60 BSW
3/32 - 48 BSW
1/8 - 40 BSW
5/32 - 32 BSW
3/16 - 24 BSW
7/32 - 24 BSW
1/4 - 20 BSW
5/16 - 18 BSW
3/8 - 16 BSW
7/16 - 14 BSW
1/2 - 12 BSW
9/16 - 12 BSW
5/8 - 11 BSW
3/4 - 10 BSW
7/8 - 9 BSW
1 - 8 BSW
1.1/8 - 7 BSW
1.1/4 - 7 BSW
1.3/8 - 6 BSW
1.1/2 - 6 BSW
1.5/8 - 5 BSW
1.3/4 - 5 BSW
1.7/8 - 4.5 BSW
2 - 4.5 BSW
2.1/4 - 4 BSW
2.1/2 - 4 BSW
2.3/4 - 3.5 BSW
3 - 3.5 BSW
3.1/4 - 3.25 BSW
3.1/2 - 3.25 BSW
3.3/4 - 3 BSW
4 - 3 BSW
4.1/2 - 2.875 BSW
5 - 2.75 BSW
5.1/2 - 2.625 BSW
6 - 2.5 BSW
3/16 - 32 BSF
7/32 - 28 BSF
1/4 - 26 BSF
9/32 - 26 BSF
5/16 - 22 BSF
3/8 - 20 BSF
7/16 - 18 BSF
1/2 - 16 BSF
9/16 - 16 BSF
5/8 - 14 BSF
11/16 - 14 BSF
3/4 - 12 BSF
13/16 - 12 BSF
7/8 - 11 BSF
1 - 10 BSF
1.1/8 - 9 BSF
1.1/4 - 9 BSF
1.3/8 - 8 BSF
1.1/2 - 8 BSF
1.5/8 - 8 BSF
1.3/4 - 7 BSF
2 - 7 BSF
2.1/4 - 6 BSF
2.1/2 - 6 BSF
2.3/4 - 6 BSF
3 - 5 BSF
3.1/4 - 5 BSF
3.1/2 - 4.5 BSF
3.3/4 - 4.5 BSF
4 - 4.5 BSF
4.1/2 - 4 BSF
4.1/4 - 4 BSF
To choose
Type
Bolt
Nut
Thread class
Medium
Open
Close
Material class
SAE J403 1045
ASTM A 193 Grade B7 up 2 1/2"
ASTM A 193 Grade B7 above 2 1/2" up 4"
ASTM A307 Grade A, B e C
ASTM A 320 Grade L7
ASTM a 325 Type 1 e 2
ASTM a 325 Type 3
ASTM A 449 Type 1 of 1/4" up 1"
ASTM A 449 Type 1 above 1" up 1.1/2"
ASTM A 449 Type 1 above 1.1/2" up 3"
ASTM A 449 Type 1 above 1.1/4" up 1"
ASTM A490 Type 1, 2 e 3
SAE J403 1020
SAE J403 1045
SAE J403 4140
SAE J403 4340
ASTM F 593 C
ASTM F 593 D
ASTM F 593 G
ASTM F 593 H
ASTM F 593 V
ASTM F 593 W
ASTM F 593 P
ASTM F 593 R
ASTM F 593 R
ASTM F 468 B
ISO 3506-1 A2-70
ISO 3506-1 A4-70
ISO 3506-1 F1-60
ISO 3506-1 C1-70
ISO 3506-1 C1-110
8.8
3.6
4.6
4.8
5.6
5.8
6.8
8.8
9.8
10.9
12.9
14.9
Lubricated
No
Yes
Thread length (Dr)
Wire diameter (Dr)