202-153 R&D Steel Split Half Couplings 4" B/W 0.75"

4" Borg Warner, PRM, Hurth 

Split Hub Coupling - Flange(a) -  4", Bolt Circle(b) - 3.25", # of Holes(c) - 4, Bolt Size(d) - 3/8", Pilot Dia(e) - 2.50" Male, Length(f) - 3.19", Hub Dia.(g) - 3.38"

Max Bore 1.50" or 40 mm