A20-A40 Replacement V-Belt A Section for Lawn Mower & Industrial Use

The number after the "A" indicates the belt's effective or inside circumference in inches for most OEM references (e.g., A24 = approximately 24" inside circumference). Outside circumference is typically the size number plus 2 inches for A-section belts — so an A24 is generally about 26" (660mm) outside circumference. Always verify against your equipment's owner's manual or the designation printed on the sidewall of your old belt. If measuring a worn belt, measure the outside circumference and subtract approximately 2" to estimate the A-section number.

A-section V-belts generally have a standardized top width of 1/2" (13mm) and a depth of approximately 5/16" (8mm). The included angle is typically 40°. These dimensions are consistent across the A-section classification and are designed to fit standard A-profile pulley grooves.

These belts are generally suitable for outdoor equipment such as riding lawn mowers and garden tractors. Rubber-compound construction provides reasonable resistance to moisture encountered during normal outdoor use. However, prolonged exposure to standing water, petroleum-based oils, or harsh chemicals may accelerate belt degradation. For consistently wet or chemically aggressive environments, contact us to confirm suitability before ordering.

A-section V-belts are a widely used industry standard and are typically compatible with riding lawn mowers and garden tractors (deck drive and blade engagement), single-phase air compressors, bench-top drill presses and lathes, fans, and other light-to-medium industrial power transmission equipment that uses standard A-profile pulleys. Always verify the belt designation in your equipment's service manual before ordering.

Common indicators include visible cracking, glazing, or fraying on the belt surface or sidewalls; slipping, squealing, or vibration during operation; reduced power transfer to the driven component (e.g., mower blades spinning slowly); or the belt riding noticeably low in the pulley groove. Replacing a worn belt promptly helps prevent damage to pulleys and bearings.

A-section V-belts are generally rated for light-to-medium duty power transmission. Actual load capacity depends on belt length, pulley diameter, center distance, speed, and operating conditions. In most lawn mower and small compressor applications, A-section belts are well-suited to the drive requirements. Refer to your equipment's OEM specifications or a belt drive engineering reference to confirm the correct belt rating for your specific application.

Each order is for 1 piece (1Pcs) of the selected belt size. If your equipment requires matched belt pairs (common on some dual-belt mower deck drives), simply add the required quantity to your cart or contact us if you need assistance selecting matched belts.