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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. A 1/4W wrench is the same as a 5/16BS, and is .525 inches across the flats, or 13.34mm. Please measure for your application before ordering Whitworth tools.

 
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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