D&D Global 350-S8M-848 Timing Belt - S8M Section, 35mm Wide, 106T, 848mm XL 100-S5M-900 has a 5 mm

100-S5M-900 has a 5 mm tooth pitch

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so a 6/BX81 from any major manufacturer shares the same dimensions and runs on the same pulleys/sheaves

The Bando 6PK2185 Automotive Serpentine Belt is a Micro-V (multi-ribbed) belt with Micro-V ribbed PK-section dimensions

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D&D Global 350-S8M-848 Timing Belt - S8M Section, 35mm Wide, 106T, 848mm XL 100-S5M-900 has a 5 mmThe D&D Global 350 S8M 848 is a synchronous timing belt with S8M pitch profile, manufactured by D&D Global. This belt uses a S Tooth profile designed for smooth meshing action and reduced noise in precision timing applications. Constructed with Neoprene body and fiberglass cord tensile cord for precise positioning and dependable synchronous power transmission. Specifications Pitch Profile S8M Pitch 8. 0 mm Tooth Profile S Tooth Tooth Location Single