Overview
ISO 5289:2018 - "Agricultural machinery - Endless hexagonal belts and groove sections of corresponding pulleys" specifies the main dimensions, tolerances and measurement methods for endless hexagonal belts used in agricultural machinery (notably harvester‑threshers) and the groove profiles of the matching fixed‑diameter pulleys. The standard standardizes belt cross‑sections, nominal effective lengths, measuring equipment and test procedures to ensure interchangeability, reliable power transmission and consistent performance in agricultural drive systems.
Key Topics
- Belt cross‑sections and profiles: Defines four standard hexagonal profiles (HAA, HBB, HCC, HDD) with nominal width and height values (examples: HAA w = 13 mm, T = 10 mm; HCC w = 22 mm, T = 17 mm).
- Standard lengths and tolerances: Covers effective length series (R40 preferred numbers) from about 1 320 mm to 10 000 mm, with length tolerances that vary by size and profile (typical tolerances in the standard range from ±13 mm up to ±50 mm).
- Grooved pulley compatibility: Specifies compatible pulley groove systems - the datum system (ISO 4183) and the effective system (ISO 5291) - and maps hexagonal belt profiles to groove types (e.g., HAA → A/AJ, HBB → B/BJ).
- Measurement methods: Describes the measuring device (two grooved measuring pulleys, one movable), required measuring forces and pulley dimensions, and a defined procedure and formula for calculating the belt’s effective length from measured centre distances and the measuring‑pulley circumference.
- Speed ratio and diameter corrections: Provides guidance on calculating speed ratio and explains correction factors needed to obtain pitch diameters when using ISO 4183 (datum) or ISO 5291 (effective) pulley systems.
Applications
ISO 5289:2018 is intended for:
- Agricultural machinery designers and OEMs specifying drive components for harvesters and threshers.
- Belt and pulley manufacturers producing belts, grooved pulleys and measuring/test fixtures to standardized dimensions.
- Maintenance engineers and fleet managers selecting replacement belts that meet dimensional and tolerance requirements.
- Test laboratories performing length and performance verification using the standard measurement procedure.
Using belts and pulleys that conform to ISO 5289 reduces downtime, improves interchangeability across suppliers, and ensures predictable power transmission characteristics in agricultural drives.
Related Standards
- ISO 4183 - Classical and narrow V‑belts, pulley groove system (datum)
- ISO 5291 - Grooved pulleys for joined classical V‑belts (effective)
- ISO 1081 - Belt drives - Vocabulary and definitions
- ISO 24035, ISO 3 - referenced for length series and tolerance basis
Keywords: ISO 5289:2018, endless hexagonal belts, agricultural machinery, grooved pulleys, belt dimensions, belt measurement, belt profiles, harvester‑thresher.
Open preview (PDF)Agricultural machinery — Endless hexagonal belts and groove sections of corresponding pulleys