Black Ace Dual Pitch Roller Chain Sprockets are produced with the highest integrity. You will understand value, as these sprockets are flame-cut and machined with the highest precision in the marketplace.
ANSI Standard Torch Profiles
A – B – C Hub Types
A Type (no hub) typically used in weld-on applications.
B Type (hub using one side) used in applications where clearance width is narrow. Less expensive than C Type.
C Type (hub on both sides) used in applications where B Type isn't wide enough to withstand torques produced by drive.
Split Style Building – Once you use a Split Sprocket, you might never want to employ a setscrew mount style again. Removal or set 
up is a breeze. Can be used in practically all applications. Another advantage to Black Ace's split sprockets is definitely that the shaft/keyway protection is much tighter than a typical setscrew mount.
Hardening Offered – Flame hardening of sprockets is available as a choice.