V-Belt B Section 17mm x 11mm — Metric & Imperial Sizes | Industrial Transmission Belt

Measure the outside circumference of the belt path (or the old belt) and match it to the perimeter listed in the variant options. Metric sizes are listed in mm (e.g., 1000mm); imperial sizes use the B-number designation where the number roughly equals the inside circumference in inches (e.g., B-40 ≈ 40" inside, ≈ 1016mm perimeter). When in doubt, go up one size — a slightly longer belt is easier to tension than one that is too short.

This belt uses the standard B-section profile: 17mm (≈21/32") top width and 11mm (≈7/16") depth. It is compatible with any B-section sheave or pulley groove conforming to ISO 4184 or RMA/MPTA standards.

B-section belts are generally rated for moderate-to-heavy power transmission. Actual load capacity depends on pulley diameter, speed, and center distance. For most single-belt drives, B-section belts typically handle 1–5 HP per belt at common operating speeds. Consult your equipment manual or a belt drive design guide for precise power ratings.

B-section V-belts are generally made from rubber compounds that offer reasonable resistance to moisture and moderate temperature ranges. However, prolonged exposure to oils, solvents, or extreme UV can degrade the belt. For outdoor agricultural or HVAC applications, the belt will typically perform well under normal weather conditions. Avoid direct contact with petroleum-based lubricants.

If your equipment calls for a B-section belt (sometimes labeled as '5L' in fractional horsepower sizing), this belt will fit any B-section sheave. Check your equipment's service manual for the belt designation — if it starts with 'B' (e.g., B-40, B-55) or lists a 17mm top width, this belt is compatible.

Both refer to the same B-section cross-section (17mm x 11mm). Metric sizes list the belt's outer perimeter in millimeters (e.g., 1000mm). Imperial sizes use the traditional B-number system where the number approximates the inside circumference in inches (e.g., B-40 ≈ 40" inside ≈ 1016mm perimeter). Choose the standard that matches your equipment's specification.

Replace your V-belt when you notice visible cracking, fraying, glazing on the sides, or if the belt has stretched to the point where tensioning is no longer possible. Slipping, squealing, or reduced equipment performance are also common signs. Routine inspection every 3–6 months is generally recommended for industrial applications.