D&D Global 315J15 Micro-V Serpentine Belt - J Section, 15 Ribs, 31.5in Super HC Belt What does the 8M in

What does the 8M in 2504-8M-50 mean

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Prefer our Diesel Belting equivalent: BX37 Classic Cogged V-Belt 21/32 x 40in Outside Circumference

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D&D Global 315J15 Micro-V Serpentine Belt - J Section, 15 Ribs, 31.5in Super HC Belt What does the 8M inThe D&D Global 315J15 is a Micro V (multi ribbed) belt with Micro V ribbed J section dimensions, manufactured by D&D Global. Micro V belts deliver smooth, quiet operation with high power capacity in a compact cross section, ideal for serpentine and multi accessory drive systems. Constructed with Neoprene body compound and polyester cord tensile members for reliable power transmission and long service life. Specifications Belt Section J Belt Type Micro