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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British 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

Stahlwille 12665/52 Metric and Whitworth Thread Gauge
Horex 2618 102 Whitworth Screw Pitch Gauge
Horex 2636-101 Whitworth 55 Degree Lathe Gauge
Kukko 97-4 Thread File Elora 258-WW Thread File Picard 0001001-0100 English Pattern Cross Pein Hammer
Gedore 20 0BA 1/4" Drive British Addociation Socket Gedore 20 BA-9 Set 1/4" Drive Elora 3/8" Drive Whitworth Socket Set
Ko-Ken KO3405W/8 Set 3/8" Drive Whitworth Socket Set Gedore D19WWSet-7, 1/2" Drive Whitworth Socket Set Gedore D19-11/16W, 1/2" Drive Whitworth Socket 12 Point
Exact EX00836 BSW 3/8" Hand Tap Exact EX00832 BSW 5/16" Hand Tap Exact EX00820 BSW 3/16" Hand Tap
Gedore Combination Wrenches
Gedore 1B-7 W Combination Wrench Set Combination Wrench 1/4W Type 205
Set of 6 Elora British Whitworth size Combination Wrenches
Double Ended Offset Ring Spanner 12 point box ends
Gedore Whitworth Double Open End Spanner
Set of 3 Double Box End Shallow Offset Wrenches
Elora 156S-5A Set of 5 type BA Wrenches
Elora 202BA-0 Combination Spanner

Elora 202S 4BA Combination Wrench Set


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