From Ian Bradley's "Screw Threads and Twist Drills"
British Standard Cycle Threads, for cycle spokes (would be rolled these days with screw OD larger than the spoke)
SWG TPI Tap Drill No. (Metric Eqv.)
13 56 48 1.95
12 56 44 2.20
11 44 42 2.40
10 40 37 2.65
9 40 31 3.00
8 32 30 3.30
Do these fit?
Rod
Edit: Formatting's gone to pot. Figures are SWG, TPI, Number drill for tapping and metric equivalent for tapping.
Edited By Roderick Jenkins on 25/03/2013 22:30:06
Edited By Roderick Jenkins on 25/03/2013 22:30:59