Info:Martin 5016 Reborable Roller Chain Sprocket Coupling Halves, #5016 Chain, 0.625 to 1.688 in Dia Bore, 50 Teeth, 3.32 in OD, 2-1/2 in Dia Hub, Steel
Info:TRITAN® 5016 X 1 7/16 Type B Chain Coupling Hub With Keyway and (2) Setscrews, #50 Chain, 1-7/16 in Dia Bore, 16 Teeth, 3.517 in OD, Forged 1045 Alloy Steel
Info:TRITAN® 5016 X 1 Type B Chain Coupling Hub With Keyway and (2) Setscrews, #50 Chain, 1 in Dia Bore, 16 Teeth, 3.517 in OD, Forged 1045 Alloy Steel