Steelgrip 45 Belt Fastener - Carbon Steel, 42" Matched Set, 4 Sets per Box Series-S1 What does the S5M in

What does the S5M in 250-S5M-1050 mean

so the Megadyne SPA2650 interchanges with Gates

"name":"Gates 21/3V1180 Super HC PowerBand Belts 938521118"

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Specifications Part Number 80B15 Chain Pitch 80 Number of Teeth 15 Minimum Bore 1" Maximum Bore 2-1/2" Bore Type Plain Bore Hub Style B-Hub Strand Count Single Material Steel Outside Diameter 5

Steelgrip 45 Belt Fastener - Carbon Steel, 42" Matched Set, 4 Sets per Box Series-S1 What does the S5M inSteelgrip 45 Belt Fastener Matched Set is a hook style alligator lacing splice kit pre sized for a 42 inch belt width. For belts 5 16 to 3 8 inch on pulleys 9 inch or larger. Carbon Steel construction. Pack contains 4 matched sets (top plate, bottom plate, and corrugated hinge pin) with installation instructions. What is in the package: Multiple sets of alligator style lacing in cross scored strips Corrugated hinge pin Gauge pin Installation