Samstag Sales Fine German Hand Tools

Dealer in Fine German Made Hand Tools Since 1997
Carthage, Tennessee USA (615) 735-3388

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Whitworth Size and Number Reference

You can use the table on this page to find the size of the Whitworth tool you need. Whitworth tools can be difficult to identify. For example a 1/4W wrench is the same size as a 5/16BS wrench, and it is .525 inches across the flats, or 13.34mm. As you can see there is no inch or metric wrench of this size. Only a Whitworh wrench will fit properly. Please measure for your application before ordering Whitworth tools.
British Wrench Size Whitworth NOTE: You will find some tools marked with both the Whitworth Size and the British Standard Size. It is the same tool! .
 For help with measuring the Whitworth thread sizes we recommend the Stahlwille 12665/52 Thread Pitch Gauge. See it on our Stahlwille Web Page.

$$$$$$$$  To buy Whitworth Tools see our Whitworth Web Page.

 
Diameter of Bolts
Width Across Flats
Whitworth
British
Standard
Inches
mm
8 BA N/A 0.152 3.86
7 BA N/A 0.172 4.37
6 BA N/A 0.193 4.90
5 BA N/A 0.220 5.59
4 BA N/A 0.248 6.30
1/16 W N/A 0.256 6.90
3 BA N/A 0.282 7.16
3/32 W N/A 0.297 7.54
2 BA N/A 0.324 8.23
1/8 W (3/16) 0.340 8.64
1 BA N/A 0.365 9.27
0 BA (7/32) 0.413 10.49
3/16 W 1/4 0.445 11.30
1/4 W 5/16 0.525 13.34
5/16 W 3/8 0.600 15.24
3/8 W 7/16 0.710 18.03
7/16 W 1/2 0.820 20.83
1/2 W 9/16 0.920 23.37
9/16 W 5/8 1.010 25.65
5/8 W (11/16) 1.100 27.94
11/16 W 3/4 1.200 30.48
3/4 W 7/8 1.300 33.02
13/16 W (15/16) 1.390 35.31
7/8 W 1. 1.480 37.59
1. W 1.1/8 1.670 42.42
1.1/8 W 1.1/4 1.860 47.24
1.1/4 W 1.3/8 2.050 52.07
1.3/8 W 1.1/2 2.220 56.39
1.1/2 W 1.5/8 2.410 61.21
1.5/8 W 1.3/4 2.580 65.35
1.3/4 W 2. 2.760 70.10
(1.7/8 W) N/A N/A 76.70
N/A 2.1/4 3.150 80.01
2. W N/A N/A N/A
N/A 2.1/2 3.550 90.17
N/A 2.3/4 3.890 98.81
N/A 3. 4.180 106.17
N/A 3.1/4 4.530 115.06
N/A 3.1/2 4.850 123.19
N/A 3.3/4 5.180 131.57
N/A 4. 5.550 140.97
N/A 4.1/2 6.380 162.05

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