BlackStar H78B11 RSB - 78 Pitch B-Hub Sprocket - 11 Tooth SPC Section "mpn":"Bando-10PK1830"

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The Gates 2MR-72S-06 PowerGrip GT Sprockets - 2MR and 3MR is a timing belt sprocket

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so a 3/SPC4250 from any major manufacturer shares the same cross-section and length and runs on the same sheaves

so the Megadyne 8/B52 interchanges with Gates

BlackStar H78B11 RSB - 78 Pitch B-Hub Sprocket - 11 Tooth SPC Section "mpn":"Bando-10PK1830"The BlackStar H78B11 RSB is a 78 pitch B Hub roller chain sprocket with 11 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. Specifications Part Number H78B11 RSB Chain Pitch 78 Number of Teeth 11 Bore Type Plain Bore Hub Style B Hub Strand Count Single Material Steel Hardened Teeth Yes Outside Diameter 9. 26" Pitch