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Polyflex® JB® Belts

Polyflex® JB™ is synonymous with high power density in small spaces. Developed by Gates and produced to patented manufacturing processes, these belts provide more load-carrying capacity at higher speeds to small multiple V-belt precision drives. This results in significant cost savings and improved design freedom. Polyflex® JB™ belts are recommended for use on bench type milling machines, lathe drives, woodworking and metalworking machine spindle drives, computer peripheral equipment, small blowers, etc. They are available in 3M-JB, 5M-JB, 7M-JB and 11M-JB sections.

  • High modulus polyurethane compound with a high friction coefficient
  • The polyurethane compound resists fatigue, wear and ozone
  • Temperature range: -65°F to 185°F (-54°C to 85°C)

All Parts

1-10 of 629 Items
Part # Product # Description Outside Circumference (in) Outside Circumference (mm) Effective Length (in) Effective Length (mm) Top Width (in) Top Width (mm) Section Num. Ribs Angle Notched Num Strands
2/11M1000JB / 2/11M1000JB 89142100 2/11M1000JB POLYFLEX 38.7 11M false 2
2/11M1030JB / 2/11M1030JB 89142103 2/11M1030JB POLYFLEX 39.9 11M false 2
2/11M1060JB / 2/11M1060JB 89142106 2/11M1060JB POLYFLEX 41 11M false 2
2/11M1090JB / 2/11M1090JB 89142109 2/11M1090JB POLYFLEX 42.2 11M false 2
2/11M1120JB / 2/11M1120JB 89142112 2/11M1120JB POLYFLEX 43.4 11M false 2
2/11M1150JB / 2/11M1150JB 89142115 2/11M1150JB POLYFLEX 44.6 11M false 2
2/11M1180JB / 2/11M1180JB 89142118 2/11M1180JB POLYFLEX 45.8 11M false 2
2/11M1220JB / 2/11M1220JB 89142122 2/11M1220JB POLYFLEX 47.3 11M false 2
2/11M1250JB / 2/11M1250JB 89142125 2/11M1250JB POLYFLEX 48.5 11M false 2
2/11M1280JB / 2/11M1280JB 89142128 2/11M1280JB POLYFLEX 49.7 11M false 2
1-10 of 629 Items

Features and Benefits

  • Excellent adhesion of tensile cords and polyurethane compound leads to high fatigue resistance and long belt life
  • Small cross-section meets special application needs such as high shaft speeds, small drive package size and smooth running requirements
  • Ribs relieve bending stress on small pulleys and provide lateral rigidity
  • The precise casting method eliminates overlaps and layers
  • Joined Belt construction improves stability