Terminology, reference 6 =(6 x 1/8 = 3/4") B = British Standard, -1 = Simplex (one row of teeth)
Last 2 numbers denote number of teeth
e.g. 61.38 = 3/4 pitch, Simplex, 38 Tooth Sprocket
To suit British Standard Roller chain :- 12B-1 (B.S. Reference), 110066 (Renold), 6SR (Morse)
