V-Belt A Type Triangle Belt — Sizes A-500 to A-3750 | Industrial & Agricultural

Measure the outside circumference of your old belt or the center-to-center distance between your pulleys. For A type belts, the number after the "A" indicates the effective (inside) length — our variants are listed in millimeters. For example, A-500mm is approximately A-20 in traditional US inch sizing (500 ÷ 25.4 ≈ 19.7"). When in doubt, size up slightly to allow for tensioner adjustment. If you know your belt's US inch designation, multiply by 25.4 to find the closest mm variant.

A type (also called A section or 4L section) V-belts typically measure approximately 13mm (1/2") wide at the top and 8mm (5/16") deep, with a 40° included angle. These dimensions are standardized, so an A type belt from HomeDIYer will generally fit any A-groove pulley regardless of equipment brand.

A type V-belts are generally rated for light-to-medium duty power transmission. Actual power capacity depends on pulley diameter, belt speed, and drive design. Typical single A-belt drives handle anywhere from fractional horsepower up to several horsepower depending on operating conditions. Consult your equipment's service manual for the rated horsepower and belt specification to confirm suitability.

Yes, generally. A type V-belts are typically made from oil- and heat-resistant rubber compounds that tolerate occasional moisture and outdoor exposure well, making them suitable for agricultural V-belt applications on tractors and farm machinery. Avoid prolonged exposure to ozone, direct UV radiation, or chemical solvents, which can degrade rubber over time. For continuous wet environments, check your equipment manufacturer's recommendation.

A type V-belts are one of the most widely used drive belt standards in North America and are compatible with any A-section or 4L-section pulley groove. Common equipment includes agricultural tractors, single-phase air compressors, lawnmowers, conveyor drives, woodworking machines, and HVAC blower assemblies. Always verify the required belt length and cross-section in your equipment's parts manual before ordering.

Replace your A type V-belt if you notice any of the following: visible cracking or fraying on the belt body, glazed (shiny) sidewalls indicating slippage, squealing or chirping under load, exposed tension cords, or a belt that has stretched beyond the tensioner's adjustment range. For agricultural and industrial equipment, a seasonal inspection is generally recommended to catch wear before it causes unexpected downtime.

Yes. Many industrial and agricultural drives use matched sets of A type belts in multi-groove pulleys to increase power capacity. When replacing a matched set, it is generally recommended to replace all belts simultaneously to ensure even load sharing and prevent the new belt from carrying a disproportionate load against a stretched older belt.