V-Belt 5L770 / B74 5/8" x 77" Heavy Duty Industrial Replacement Belt

B74V-Belt (5L770) — a classical B-section V-belt engineered for reliable power transmission in larger machinery and more demanding motor systems. With a 5/8" top width, 74" inside length, and 77" outside length, this heavy-duty belt is ideal for industrial equipment, agricultural machinery, HVAC systems, and larger compressors.

Note: Inside length is about 3" shorter than outside length

Key Features:

• Belt Type: Classical B Section (5L770 / B74)

• Dimensions: 5/8" top width x 13/32" height x 77" outside length

• Inside Length: 74" (approximately 3" shorter than outside length)

• Outside Diameter: 77"

• Angle: Standard 40° V-angle for secure grip and consistent performance

  Construction:

  • Core: Features helically wound tensile cords made of high-strength, heat- and chemical-set polyester. The cords are engineered for superior tensile retention and long-term durability, tested to meet world-class performance standards.

  • Wrap: The outer wrap is a durable synthetic rubber fabric that resists oil, heat, and abrasion. Designed for extended service life under tough operating conditions.

  • Body: Composed of a high-performance synthetic rubber compound, formulated for flexibility, cool operation, and resistance to cracking. Strong adhesion to both cords and outer fabric ensures optimal belt integrity.

  • Temp Range: -30°F to 140°F (-34°C to 60°C) — suitable for both indoor and outdoor use

    Common Applications:

    • Larger lawn & garden equipment (riding mowers, garden tractors)

    • Belt-driven air compressors and shop tools

    • Agricultural equipment (combines, balers, conveyors)

    • HVAC systems, industrial fans, and blower motors

This B74 / 5L770 V-belt delivers high-performance operation with reduced noise and minimal maintenance. Ideal for heavy-duty applications where strength, reliability, and endurance are key, it's a trusted choice for OEM replacements in both commercial and agricultural settings.