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Quoting: 50AR21 Linn — Roller Chain Sprocket; 50 Chain; 21 Teeth; 1 Row of Teeth; No Hardened Teeth; 4.522" Outside Diameter; 4.194" Pitch Diameter; A-No Hub; Rough Bore Mount; No Bushing; 5/8" Chain Pitch; ANSI Roller Chain; No Keyway; Steel Material
For immediate line-down emergencies, call 915-845-8188.