Overview
The Gates BX81 is a molded-notch, heavy-duty V-belt engineered for superior performance on classical cross-section industrial drives. Gates BX81 V-belts deliver dependable power transmission in harsh operating environments where temperature swings and mechanical stress demand robust construction. With an 84-inch outside circumference and patented ethylene EPDM compound elastomer, this belt resists belt cracking, oil contamination, and extreme temperature fluctuations while maintaining consistent grip and minimal slippage across small-diameter sheaves.
Key Features
- Molded-Notch Construction: Special notch design makes the BX81 especially suited for drives requiring small diameter pulleys and back idlers, improving flexibility without sacrificing load capacity.
- Patented Ethylene EPDM Compound: Ethylene EPDM compound construction allows the belt to resist cracking and handle extreme temperatures.
- Machined Edge: Belt edge is machined for even sheave groove contact, resulting in smoother running, less slip, and wear.
- Flex-Bonded Cords: Polyester cords strongly bonded to the belt body for equal load distribution and reduced bending stress deterioration.
- Wide Temperature Range: Working temperature range of -60 to +250 degrees F to protect the belt from cracking.
- RMA Certified: Meets RMA oil and heat resistance standards and static conductivity requirements.
Technical Specifications
- Belt Section: BX (Classical Cross-Section)
- Outside Circumference: 84.21 inches / 2,139 mm
- Top Width: 21/32″
- Thickness: 13/32″
- Angle: 40 degrees
- Temperature Range: -70°F to +250°F (-51°C to +121°C)
- Material: EPDM (Ethylene Propylene Diene Monomer) elastomer with polyester cord reinforcement
- Construction: Bandless, molded-notch, raw-edge
- Back Side: Smooth
- Inside: Notched
- Weight: 0.75 lbs per belt
- Series: Tri-Power™ (Gates Series 9098)
- RMA Certification: Oil and heat resistant
Typical Applications
V-belts are found in drive systems in the automotive, agricultural, textile, printing, mining, and office equipment industries, among others. The Gates BX81 is particularly suited for:
- Industrial and manufacturing equipment with heavy-duty drive requirements
- Systems using small-diameter sheaves or sub-minimal pulley configurations
- Back-idler drive systems requiring belt flexibility
- Applications requiring thermal stability and oil resistance
- Multi-belt drive systems using the V80 matching system
Compatibility & Replacements
Compatible With
- BX-section sheaves (pulleys) with 40-degree grooves
- Classical cross-section industrial drive systems
- Small-diameter pulley assemblies (sub-minimal sheave applications)
- Back-idler tensioning systems
- Gates V80 matching system (ensures precise belt length matching across multiple units)
Replaces / Drop-In Replacement For
- OEM BX81 V-belts from original equipment manufacturers
- Other BX-section molded-notch V-belts with 84-inch outside circumference
- Older wrapped B-section belts in comparable classical cross-section applications
Works With
- Standard BX-section sheave/pulley systems (40-degree groove angle)
- Industrial drive systems rated for -70°F to +250°F ambient or operating temperatures
- Multi-belt systems (Gates V80 ensures all matched BX81 belts work together for full design horsepower)
- Oil-rich and contaminated environments where EPDM elastomer provides superior resistance
