Dragonfly shock absorber cover bolts.

[Sgtbiro]

Hi all could someone please supply me with the dimensions of the the two bolts part number 23065 which attach the shock absorber cover to the gearbox on a Dragonfly.
Cheers Kevin..
 

[patrickwhitty]

2 1/2 inches long (excluding the head) x 1/4 inch, 1/2 inch threaded. Not sure of the thread but it matches a 1/4 x 28 UNF tap. What did Douglas use, BSW?  That is what it looks like but perhaps someone will correct me. I must build up my stock of nuts and bolts, they come in handy for identifying bolt sizes.

[eddie]

The bolts are 1/4" BSF - (1/4 x 26 tpi).

  Eddie.


  Generally, most threads on postwar machines are Whitworth form (BSF or BSW), except wheel spindles and on later Dragonfly wheels (British Hub), which are British Standard Cycle threads.

[Sgtbiro]

Thanks for the info guys it’s much appreciated.
Regards kevin...