Douglas 2 3/4hp - 1912-1919 Castellated Fork Spindle Nuts: 26 TPI (Stainless Steel)

Product no.: 0736 DG234_023

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This is the castellated nut as fitted to the front fork spindles on early Douglas models - approximately 1912-1919.  They are CNC manufactured by us, copying an original Douglas fork spindle nut as a template.

The nuts are deeper than commercially available nuts, and use the the correct imperial 0.525" accross flats hex, to fit a 1/4 Whit spanner, as per the originals.

Note that the thread on these nuts is 5/16 x 26tpi BSC (not Douglas 25tpi thread).  I am not entirely sure, but believe original early Douglas fork spindles may have used a Douglas specific 25tpi thread.  Although our nuts will start to go on an original fork spindle with a 25tpi thread, it is not good practice and I cannot advise doing it.  Therefore - if you are unsure, please try a commercially available nut 5/16 x 26tpi BSC nut on your spindle first (or use a thread gauge if you have one), as unfortunately we cannot accept returns on these nuts (as we cannot check the thread will have been stretched) - hope you understand.

Apologies these nuts are not cheap - but they are not easy to manufacture, each slot has to be individually machined which makes them very time consuming on our machine (and actually when I tried to speed this process up, ended up snapping the miniscule endmills!)


Each nut is linished and comes with a stainless steep split pin

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