Taking a grinder to Britain's motorcycling heritage.
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BRITISH CLASS

BRITISH CLASS
MONTGOMERY-ANZANI

SPANNER and WRENCH EQUIVALENT GUIDE



SOCKETS and WRENCHES (SPANNERS)

Key to Nut & Bolt Sizes
Nut size Across FlatsBritish sizes
decimal in.mmin.BABSFBSW
0.250
1/4


0.2767



0.282

3

0.312
5/16


0.3168



0.324

2

0.340


3/161/8
0.343
11/32


0.3549



0.365

1

0.375
3/8


0.39410



0.412

0

0.43311



0.437
7/16


0.445


1/43/16
0.47212



0.500
1/2


0.51213



0.525


5/161/4
0.55114



0.562
9/16


0.59015



0.600


3/85/16
0.625
5/8


0.62916



0.66917



0.687
11/16


0.70818



0.710


7/163/8
0.74819



0.750
3/4


0.78720



0.812
13/16


0.820


1/27/16

0.82721




0.86622




0.875
7/8



0.90623




0.920


9/161/2

0.938
15/16



0.94524




0.98425




1.000
1



1.010


5/89/16

1.02426




1.063271 1/16



1.100


11/165/8

1.10228




1.125
1 1/8



1.18130




1.188
1 3/16



1.200


3/411/16

1.250
1 1/4



1.26032




1.300


7/83/4

1.313
1 5/16



1.33934




1.375
1 3/8



1.390



13/16

1.41736




1.438
1 7/16



1.480


17/8

1.49638




1.500
1 1/2



1.563
1 9/16



1.57540


15/16

1.625
1 5/8



1.670


1 1/81

1.688
1 11/16



1.750
1 3/4



1.81146




1.813
1 13/16



1.85047




1.860



1 1/8

1.875
1 7/8



1.89048




1.938
1 15/16



1.96950




2.000
2




2.050



1 1/4