Gates 645-3M-09 PowerGrip HTD Belts D v=1605821805"

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How do I measure my old V-belt to confirm the Gates 4L400K is the right replacement

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The Gates 8/BX128 Tri-Power PowerBand Belts 90988128 is a banded V-belt featuring Cogged B-section dimensions

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Gates 645-3M-09 PowerGrip HTD Belts D v=1605821805"The Gates 645 3M 09 PowerGrip HTD Belts is a synchronous timing belt with 3M pitch profile, manufactured by Gates Corporation. This belt uses a curved (HTD) tooth profile for improved load distribution and reduced backlash in precision timing applications. Constructed with Neoprene body compound and fiberglass cord tensile members for reliable power transmission and long service life. Specifications Pitch Profile 3M Pitch 3 mm Tooth Profile Curved