BlackStar H200U21 - 200 Pitch QD Sprocket - 21 Tooth QD-SD "text": "The 6/8V4250 has a

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"name": "What does the S8M in 250-S8M-1840 mean

The 11/B78 is used for high-shock and high-vibration drives

BlackStar H200U21 - 200 Pitch QD Sprocket - 21 Tooth QD-SD "text": "The 6/8V4250 has aThe BlackStar H200U21 is a 200 pitch QD roller chain sprocket with 21 teeth, precision manufactured from SAE 1045 steel with induction hardened teeth for extended wear life and features machine cut tooth profiles for smooth, reliable chain engagement. This sprocket requires a QD Bushing (sold separately). Specifications Part Number H200U21 Chain Pitch 200 Number of Teeth 21 Bore Type Plain Bore Hub Style QD Bushing Required QD Bushing Strand Count