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


  • Section: 5M
  • Pitch: 5.3 mm
  • Width: 5 mm
  • Height: 3.3 mm
  • Effective Length: 1000 mm
  • Number of Ribs: 3


  • Joined belt construction improves stability
  • Ribs relieve bending stress on small pulleys and provide lateral rigidity
  • 60º angle results in better support of the tensile section, and provides a more even load distribution
  • Small cross-section meets special application needs such as high shaft speeds, small drive package size and smooth-running requirements
  • High modulus polyurethane compound with a high friction coefficient
  • The precise casting method eliminates overlaps and layers
  • Excellent adhesion of polyester tensile cords and polyurethane compound leads to high fatigue resistance and long belt life
  • Extra tough, the polyurethane compound resists fatigue, wear and ozone.


  • Long belt life on small pulleys and compact drives
  • Greater shaft speeds, up to 30,000rpm
  • High performance and smooth running for precision applications
  • Cost savings and design freedom
  • Avoids vibrations when subjected to shock loadsBack idlers can be used.

Temperature Range

  • Range: -54°C to +85°C
SKU: A0033780

Gates 3/5M1000JB (8912-3100) Polyflex JB Joined V Belt

Polyflex Joined V-Belt - Light Duty Belt

RRP $210.10
SAVE $102.72 (49%)

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  • AIMS SKU A0033780
  • Brand Gates
  • Model Number 8912-3100
  • Barcode Number 72053261851
  • Type Polyflex JB - Joined Belt
  • System of Measurement Metric
  • Material Polyester Cord
  • Belt Code 3/5M1000JB
  • Length (mm) 1000
  • Section 5M
  • Belt Width (mm) 15
  • Ribs 3
  • Pitch (mm) 5.3
  • Application Light-Duty Belt
  • Depth (mm) 3.3
  • Series Gates Polyflex JB Belt

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