V-Belt 4L420 / A40 – 1/2" x 42" Heavy Duty Industrial Replacement Belt

A40 V-Belt (4L420) — a classical A-section V-belt designed for dependable power transmission in compact machinery and small motor systems. With a 1/2" top width, 40" inside length, and 42" outside length, this heavy-duty V-belt is ideal for use in lawn mowers, air compressors, agricultural tools, and light industrial equipment.

*Note: Inside length is about 2" shorter than outside length

Key Features:

• Belt Type: Classical A Section (4L420 / A40)

• Dimensions: 1/2" top width x 5/16" height x 42" outside length

• Inside Length: 40" (approximately 2" shorter than outside length)

• Outside Diameter: 42"

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

Construction:

• • Core: The helically wound tensile cords are specially engineered, twisted, heat and chemically set, polyester material. Testing has proven that the tensile decay properties of BESTORQ Cord are truly World Class.

• • Wrap: The outer fabric wrap is treated with highly oil and heat resistant, engineered synthetic rubber compound, specifically compounded for excellent wear resistance, proven through thousands of hours of testing.

• • Body: The body rubber compound is a highly engineered synthetic rubber compound, specially compounded for cool running, flexibility, crack resistance, and excellent bonding to the outer fabric and tensile cords.

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

Common Applications:

• Lawn & garden equipment (mowers, tillers, snowblowers)

• Small air compressors and belt-driven machinery

• Agricultural equipment (grain augers, balers)

• Drill presses, shop tools, and HVAC blowers

This A40 / 4L420 V-belt is engineered for long-lasting, quiet operation and fits a wide range of OEM replacements. Whether you're maintaining your home workshop or upgrading farm and garden equipment, this belt delivers the performance you can count on.