Martin Sprocket & Gear 50B15 Sprocket

The Martin Sprocket & Gear 50B15 Roller Chain Sprocket is a single‑strand, ANSI #50 chain drive component with a Type B hub designed for compact mounting and to maintain concentricity in continuous‑duty service. It features 15 teeth, a 1-3/16 in bore, outside diameter 3.315 in, pitch diameter 3.006 in, hub diameter 2.375 in, tooth width 0.343 in, through‑bore length 1.000 in, and a 1/4 × 1/8 in keyway, with two set screws included. Constructed from high carbon steel with a protective coating, teeth are non‑hardened and the assembly weighs about 0.94 lb. MP N 50B15, chain size ANSI #50, and chain pitch 5/8 in; common replacements include Martin 50BS15 Finished Bore Sprocket, Browning H50B15, and Tsubaki 50B15 ANSI Roller Chain Sprocket.