B Section V-Belt for Industrial & Lawn Mower Replacement — Metric & Imperial Sizes

Measure the outside circumference of your old belt or the center-to-center distance between your pulleys. For metric sizes, the number in the name typically refers to the effective (pitch) length in millimeters — for example, a 1000mm belt has an effective length of approximately 1000mm (≈39.4"). For imperial sizes, the number represents the outside circumference in inches — a B37 belt is approximately 37" on the outside. When in doubt, go up one size; a slightly longer belt is generally easier to tension than one that is too short.

B section V-belts are designed for medium-duty power transmission. They can typically handle drive loads ranging from fractional horsepower up to several horsepower depending on operating speed, pulley diameter, and drive configuration. For exact load ratings specific to your application, consult your equipment's service manual or contact us to confirm suitability.

B section V-belts are generally made from rubber compounds that offer reasonable resistance to moisture and moderate temperature variation. However, prolonged exposure to standing water, oil, or extreme UV can accelerate wear. For outdoor lawn mower or agricultural use, ensure the belt is shielded by a deck or guard where possible, and inspect the belt periodically for cracking or glazing.

Yes. These belts conform to the standard B section profile (typically 17mm top width × 11mm height, 40° included angle) and are compatible with any pulley or sheave designed for B section V-belts per ISO 4184 / RMA IP-20 standards. Always verify your pulley groove profile before ordering to ensure a proper fit.

A quick rule of thumb: divide the metric effective length (mm) by 25.4 to get inches, then subtract approximately 2 inches to find the equivalent imperial belt number. For example, a 1000mm metric belt is roughly equivalent to a B37 imperial belt (1000 ÷ 25.4 ≈ 39.4", minus ~2" = 37"). When in doubt, measure your old belt and select the closest available size in your preferred unit system.

B section V-belts are used across a wide range of riding mowers, zero-turn mowers, and garden tractors. They generally fit brands such as John Deere, Husqvarna, Craftsman, Cub Cadet, Ariens, and many others that use standard B section drive systems. Always cross-reference your OEM part number or measure your existing belt length to confirm fitment before ordering.

A wrapped V-belt has a fabric cover over the rubber body, offering good durability and resistance to slipping in standard drives — this is the typical construction for classical B section belts. A raw edge (cogged or notched) belt has exposed rubber sides that grip the pulley more aggressively and flex more easily around smaller sheaves. These B section belts are typically wrapped construction. Contact us if you need raw edge or cogged variants for your application.