ISO 24035:2014

Overview

ISO 24035:2014 - Belt drives - V-belts and the corresponding pulleys for agricultural machineries - Dimensions provides standardized dimensional requirements for V-drive belts used on agricultural machinery. The standard reflects industry practice at the time of publication and aligns, where practicable, with international pulley and belt standards for industrial applications. All dimensions in the document are metric (millimetres).

Key topics and technical requirements

• Belt cross-sections and nominal dimensions: Defines belt cross-section parameters (top width W and height h) for classical, narrow/wedge, variable‑speed, hexagonal and V‑ribbed belts. Sidewall angle is typically 40° (variable‑speed belts often use 32°).
• Belt length identification: Agricultural V‑belts commonly use effective outside length (different from industrial datum length). Hexagonal and ribbed belts use specified “effective length” definitions. The standard explains the relationship between effective outside length and datum length and recommends consulting manufacturers.
• Measurement method: Describes a measuring fixture of two equal‑diameter grooved pulleys (one fixed, one sliding under a horizontal measuring force). Length is calculated as pulley circumference plus twice the center distance after seating the belt (rotate at least two revolutions).
• Ride‑out and seating: Specifies maximum permissible belt ride‑out (distance from belt top to groove top) and how to check seating on measuring pulleys.
• Tolerances and matching sets: Provides effective length tolerances across length ranges and limits on length differences for matched sets (normal and high‑modulus constructions).
• Pulley specifications and compatibility: Directs users to corresponding pulley groove standards and normative references for groove profiles and pulley dimensions.
• Material and construction notes: Permits sheet‑metal pulleys if groove dimensions are uniform and stable under belt pressure. The “H” prefix indicates belts manufactured to a higher specification.

Applications and users

ISO 24035:2014 is intended for:

• Agricultural machinery OEM designers and drivetrain engineers specifying V‑belt drives
• Belt and pulley manufacturers ensuring dimensional compatibility
• Maintenance and service technicians selecting replacement belts and pulleys
• Test laboratories performing belt length and ride‑out measurements
• Standards bodies and procurement specialists referencing harmonized dimensions

Practical applications include power transmission on tractors, combines, hay balers, and other agricultural implements where reliable belt/pulley fit, correct belt length, and interchangeability are critical.

Related standards

ISO 24035:2014 references and links with other standards for vocabulary and pulley groove dimensions, including:

• ISO 1081 (vocabulary and symbols)
• ISO 4183, ISO 5290, ISO 5291 (grooved pulleys for various belt sections)
• ISO 9982 (V‑ribbed belts and pulleys for industrial applications)

Keywords: ISO 24035:2014, V-belts, agricultural machinery, belt dimensions, pulleys, effective outside length, datum length, belt measurement, V-ribbed belts, belt tolerances.