Bolt dia. | AF spanner size inches | Spanner size MM |
1/4 inch | 6.35 mm | |
5.16 inch | 7.94 mm | |
3/8 inch | 9.52 mm | |
1/4 inch | 7/16 inch | 11.11 mm |
5/16 inch | 1/2 inch | 12.7 mm |
3/8 inch | 9/16 inch | 14.29 mm |
7/16 inch | 5/8 inch | 15.88 mm |
11/16 inch | 17.46 mm | |
1/2 inch | 3/4 inch | 19.05* mm |
9/16 inch | 7/8 inch | 22.22 mm |
5/8 inch | 15/16 inch | 23.81 mm |
1.00 inch | 25.40 mm | |
1.1/16 inches | 26.93 mm | |
3/4 inch | 1.1/8 inches | 28.57 mm |
| ||||
Number BA | BA spanner size across flats in decimal inches. | Metric equivalent |
10BA | .117 inches. | 2.97mm |
9BA | .131 inches | 3.33 mm |
8BA | .152 inches | 3.86mm |
7BA | .172 inches | 4.37mm |
6BA | .193 inches | 4.90mm |
5BA | .220 inches | 5.59mm |
4BA | .248 inches (used in older UK light switches and boxes etc) | 6.30mm |
3BA | .282 inches | 7.16mm |
2BA | .324 inches (Probably the most commonly used BA size) | 8.23mm |
1BA | .365 inches | 9.27mm |
0BA | .413 inches | 10.49mm. |
| 3/4 inch af | |||
| 15/16 inch af | |||
| 1 + 1/16 af | |||
| 1 +1/4 inch af | Virtually every nut and bolt on these vehicles is whitworth or BSF. | ||
| 1 + 5/16 inch af 6 point deep socket | Mini,Austin Allegro,Austin/Morris 1100 and 1300 Austin Maxi. | Front wheel drive hub nuts.Also cranshaft pulley and rear hub on MGB. | |
| 1 + 1/2 inch af.6 point deep socket | Front suspension ball joints | Mini,Allegro.Austin/Morris 1100 or 1300,Maxi. | Also fits Mini flywheel nuts. |
| 1 + 5/8 inch af | Probably other early BMC rear wheel drive A40 etc. | ||
| 1 + 3/4 inch (socket or box) | Ball joints. | Some early Leyland vehicles | Socket must be deep type for ball joint application. |
| 1 + 13/16 inch af 6 point deep socket | Front suspension ball Joints | Rover group Metro vehicles Also ...Modern Triumph motorbikes?. | Normally impact type.1/2 inch square drive. |
| 1 + 7/8 inch af | Older BMC (Wolseley 1500 etc). | Available as H/D box or socket. | |
| 2 inch AF. | Hub nuts | Land Rover etc (used as substitute for 52mm) | See list at foot of page.** |
| 2 +13/16 inch af | |||
| 2 +3/4 inch af | |||
| 3 inch af | |||
| 3 + 1/8 inch af | Also some IVECO trucks | ||
| 7/16 inch whitworth | Scaffold Spanner | Scaffold clamps.(with a pointed end the spanner is often called a 'podger spanner'). | |
| 1 +1/8 inch whitworth | Morris Minor and other BMC vehicles | Available as deep socket or rarely box. | |
| 1 +1/4 inch whitworth. | (Panther,Vincent motorcyles and many others) | Nearest equivalent 52mm as below.** | |
| 22 mm deep | Oxygen (O2) Sensor | Modern vehicles,O2 sensors screw into exhaust. | Long socket often has 'window' in side. |
| 27 mm deep | M24 threaded injector sockets. | Most diesel injector sockets cars and light commercials.. | Will also fit some sensors. |
| 28mm deep | HGV diesel injector sockets | Larger diesel injector sockets on many HVG engines. | |
| 52mm six sided socket | Some models Land Rover and Range Rover | ||
| 56mm (usually 12 sided) | Ford Transit 1993 onwards. | Usually 3/4 drive. | |
| 65 mm (usually 12 sided) | Ford Transit (before 1993) | Ford Transit models 130,150 and 190 plus some IVECO. | |
| 67mm (six or 12 sided ) | Hub nut | Some early Ford Transit (Mk 1 twin wheel) | Later transits used 65mm hub nuts (65mm will not fit) |
| 50mm Eight sided | Austin A55,MGA.MGB* | Note these are octagonal (eight sided).* | |
| 56mm Eight sided | J2 Van and some early taxi cabs* | As above (eight sided).* |
Some web sites state that Whitworth and UNC fixings are interchangeable.This is not strictly correct,although some will loosely 'fit' the thread angle on Unified threads is 60 degrees against the 55 of Whitworth.The thread rates are also different (ie) 1/2 inch whit is 12 tpi and for 1/2 inch UNC is 13.tpi. Other thread forms that may be encountered on older machinery include BSP (British Standard Pipe) on fuel,air or oil lines etc and very rarely and on much older machinery BCS (British Standard Cycle).
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