BlackStar 41SK72 - 41 Pitch QD Sprocket - 72 Tooth Pitch-50 What does the 14M in

What does the 14M in 1316-14M-55 mean

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QD168-14M-115-J Powerhouse® HTD Timing Pulley

150T5/545R has a 5 mm tooth pitch

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BlackStar 41SK72 - 41 Pitch QD Sprocket - 72 Tooth Pitch-50 What does the 14M inThe BlackStar 41SK72 is a 41 pitch QD roller chain sprocket with 72 teeth, precision manufactured from SAE 1045 steel and features machine cut tooth profiles for smooth, reliable chain engagement. This sprocket requires a QD Type SK Bushing (sold separately). Specifications Part Number 41SK72 Chain Pitch 41 Number of Teeth 72 Maximum Bore 2 5 8" Bore Type QD Hub Style QD Bushing Required QD Type SK Bushing Strand Count Single Material Steel Outside