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Quoting: 40SH21 Linn — Roller Chain Sprocket; 40 Chain; 21 Teeth; 1 Row of Teeth; No Hardened Teeth; 3.618" Outside Diameter; 3.355" Pitch Diameter; B-Hub One Side; Bushed Mount; SH Bushing; 1/2" Chain Pitch; ANSI Roller Chain; Keyway; Steel Material
For immediate line-down emergencies, call 915-845-8188.