The belts exceed USA RMA published ratings levels; They are designed to perform at the identical or higher level than all other major USA Manufacturer's belts of the same type
640-8M-21 Synchronous Timing Belt OEM Part Number 640-8M-21 Belt Type 8M Timing Belt
Technical Specifications: (Inches) (mm) Outside Circumference 25.20 640 Top Width 0.83 21 Belt Depth 0.24 6 Material Neoprene Tooth Profile 8M
Package weight: 0.5 lbs
Description
640-8M-21 Synchronous Timing Belt OEM Part Number 640-8M-21 Belt Type 8M Timing Belt Technical Specifications: (Inches) (mm) Outside Circumference 25.20 640 Top Width 0.83 21 Belt Depth 0.24 6 Material Neoprene Tooth Profile 8M.