Jason Industrial A79 V-belt a 4L Section 81 in

Product Description

The JASON INDUSTRIAL A79 is a classical V-belt built to A/4L cross-section specifications, designed for power transmission in industrial and commercial belt-drive applications. Constructed with a natural rubber and SBR compound, a polyester tensile cord, and a cotton/polyester blend cover, it delivers reliable torque transfer across a wide range of sheave-driven equipment. The belt measures 81 inches outside length, 0.5 inches top width, and 0.34 inches thick, and weighs 0.63 pounds. Unimatch construction allows it to work as a matched replacement without requiring a full set change in most multi-belt drive configurations.

The A79 is suited for general-purpose belt-drive systems found in HVAC equipment, agricultural machinery, industrial fans, compressors, and shop equipment. The A/4L interchangeable section designation means it fits both classical A-section and 4L fractional-horsepower sheaves of the same groove profile. It is typically installed by HVAC technicians, millwrights, and general maintenance professionals performing routine belt replacement or drive system upgrades.

Key Features

• Natural rubber and SBR compound for flexibility and wear resistance across operating temperatures
• Polyester tensile cord provides high strength and low stretch under load
• Cotton/polyester blend cover resists abrasion and maintains grip on sheave walls
• A/4L interchangeable section fits both classical A and 4L fractional-horsepower groove profiles
• Conforms to ARPM (Association for Rubber Products Manufacturers) dimensional standards
• Unimatch construction supports use in multi-belt drives without full set replacement

Compatibility

Designed as a standard replacement for A-section and 4L-section V-belt drives requiring an 81-inch outside length. Fits any sheave or pulley machined to ARPM A/4L groove specifications.

Installation Notes

V-belt replacement is typically performed by HVAC technicians or maintenance mechanics. Always de-energize and lock out the drive system before removing belt guards or handling belts. Loosen the drive motor or tensioning bracket to allow belt installation without prying or forcing the belt over sheave flanges, which can damage the cord structure. After installation, set tension per the equipment manufacturer specification and verify sheave alignment before returning the system to service.