Stromberg and Su needle valve spanner sizes and AF conversion tables

[Pete Lewis]

always gives grief finding the correct spanner sizes for these little sods

 

Stromberg  Cd all models   spanner is 1/4" whitworth  5/16" BSF or 0.524"AF or 13.3mm AF  ( thats a filed out oldie)

 

 

SU   1/8"whitworth  3/16 Bsf   21/64" af or 8,64mm af

 

 

this may be useful 

Commonly used Whitworth/BSF (pre 1940) head sizes and the mm or imperial (inch) equivalent.  

 

Whitworth BSF. Metric. Inches (decimal) 1/8 3/16 8.64 .340 3/16 1/4 11.3 .445 1/4 5/16 13.34 .525 5/16 3/8 15.24 .6 3/8 7/16 18.03 .710 7/16 1/2 20.83 .82 1/2 9/16 23.37 .92 9/16 5/8 25.65 1.010 5/8* 11/16* 27.94* 1.100 11/16** 3/4 30.48 1.200 3/4* 7/8* 33.02* 1.300 7/8 1 37.59 1.480 1 1 .1/8 42.42 1.670

1 .1/8

1 .1/4

47.24

1.860

 

copied from   http://www.baconsdozen.co.uk/tools/conversion%20charts.htm

 

 

Pete