ISO 5718-2:2023 PDF

Harvesting equipment — Requirements for cutting elements — Part 2: Blades used on large rotary mowers

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Title (English):

ISO 5718-2:2023

Harvesting equipment — Requirements for cutting elements — Part 2: Blades used on large rotary mowers

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 7
Publication date:: April 19, 2023
Edition:: ISO IS 5718 edition 1 version 1
ICS:: 65.060.50

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Description (English):

This document specifies requirements for blades used as cutting elements on large rotary mowers (as defined in ISO 4254-13) for shredding crop residue, grass and small brush by impact. It specifies requirements for testing and marking of such blades. This document is not applicable to blades used on: — rotary disc mowers, rotary drum mowers, and flail mowers designed for forage crop harvesting as covered by ISO 4254‑12; — arm-type large rotary mowers; — pedestrian-controlled motor mowers; — lawn mowers covered by the ISO 5395 series. NOTE 1 The main purpose of this document is to set material characteristics. Blades on large rotary mowers are exposed to considerable centripetal forces and impacts with foreign objects. A bend test and Charpy impact test to check the brittleness and toughness of the material are therefore included in this document. NOTE 2 This document does not specify dimensional requirements.

Technical details

Technical committee: ISO/TC 23/SC 7 - Equipment for harvesting and conservation
SKU: ISO 5718-2:2023

Abstract

Overview - ISO 5718-2:2023 (Blades for Large Rotary Mowers)

ISO 5718-2:2023 is an international standard that sets material, testing and marking requirements for blades used on large rotary mowers (as defined in ISO 4254-13). It focuses on ensuring blade toughness and resistance to brittle failure when shredding crop residue, grass and small brush by impact under high centripetal forces. The document specifies test methods (Charpy impact and bend tests), acceptance criteria, sampling, marking and documentation for traceability. It does not set dimensional specifications.

Key topics and technical requirements

Scope & exclusions: Applies to blades on large rotary mowers; excludes blades for rotary disc/drum and flail mowers for forage (ISO 4254-12), arm-type large rotary mowers, pedestrian-controlled motor mowers and lawn mowers (ISO 5395).
Material requirement: Blade steel hardness shall be at least 38 HRC (Rockwell), per ISO 6508-1.
Charpy impact test (ISO 148-1):
- Test three specimens per heat of steel using X–Y orientation (ISO 3785).
- Acceptance: average Charpy impact energy ≥ 20.3 J; failing lots must be rejected or re-treated and retested.
Bend test:
- Sampling: minimum one blade per 200, at least two per lot.
- Test fixture and ram diameters defined by blade thickness (see Table 1 in standard).
- Acceptance: no visible crack or break before reaching the required permanent set angle; alternate procedure targets 14.5% permanent surface elongation across the blade.
- Corrective measures (anneal/reheat) require retest with doubled sample size for bend tests.
Marking and documentation:
- Each blade must be marked with manufacturer/trademark, lot/date/production run, and direction (if necessary).
- Packaging should indicate the standard number “ISO 5718-2”.
- Test performance and results must be documented for traceability.

Applications - who uses this standard

Blade and agricultural implement manufacturers for product design, material selection and quality control.
OEMs of large rotary mowers and attachment suppliers to ensure blade safety and performance.
Third‑party testing laboratories and in-house QA labs performing Charpy and bend tests.
Procurement, regulatory and compliance teams specifying durable, safety‑compliant cutting elements.
Service and maintenance organizations assessing replacement blade conformity.

Related standards

ISO 5718-1 (other cutting elements in the series)
ISO 4254-13 (definition and safety of large rotary mowers)
ISO 4254-12 (rotary disc/drum and flail mowers)
ISO 148-1, ISO 3785, ISO 6508-1 (normative test methods referenced)
ISO 5395 (lawn mower safety standards)

This standard is essential for ensuring the toughness, reliability and traceability of blades used in heavy-duty rotary mowing applications. Keywords: ISO 5718-2:2023, blades for large rotary mowers, Charpy impact test, bend test, Rockwell hardness, harvesting equipment, cutting elements.

Related standards

Standards mentioned in the description

Abstract

Overview - ISO 5718-2:2023 (Blades for Large Rotary Mowers)

Key topics and technical requirements

Scope & exclusions: Applies to blades on large rotary mowers; excludes blades for rotary disc/drum and flail mowers for forage (ISO 4254-12), arm-type large rotary mowers, pedestrian-controlled motor mowers and lawn mowers (ISO 5395).
Material requirement: Blade steel hardness shall be at least 38 HRC (Rockwell), per ISO 6508-1.
Charpy impact test (ISO 148-1):
- Test three specimens per heat of steel using X–Y orientation (ISO 3785).
- Acceptance: average Charpy impact energy ≥ 20.3 J; failing lots must be rejected or re-treated and retested.
Bend test:
- Sampling: minimum one blade per 200, at least two per lot.
- Test fixture and ram diameters defined by blade thickness (see Table 1 in standard).
- Acceptance: no visible crack or break before reaching the required permanent set angle; alternate procedure targets 14.5% permanent surface elongation across the blade.
- Corrective measures (anneal/reheat) require retest with doubled sample size for bend tests.
Marking and documentation:
- Each blade must be marked with manufacturer/trademark, lot/date/production run, and direction (if necessary).
- Packaging should indicate the standard number “ISO 5718-2”.
- Test performance and results must be documented for traceability.

Applications - who uses this standard

Blade and agricultural implement manufacturers for product design, material selection and quality control.
OEMs of large rotary mowers and attachment suppliers to ensure blade safety and performance.
Third‑party testing laboratories and in-house QA labs performing Charpy and bend tests.
Procurement, regulatory and compliance teams specifying durable, safety‑compliant cutting elements.
Service and maintenance organizations assessing replacement blade conformity.

Related standards

ISO 5718-1 (other cutting elements in the series)
ISO 4254-13 (definition and safety of large rotary mowers)
ISO 4254-12 (rotary disc/drum and flail mowers)
ISO 148-1, ISO 3785, ISO 6508-1 (normative test methods referenced)
ISO 5395 (lawn mower safety standards)

ISO 5718-2:2023 PDF

Technical details

Abstract

Overview - ISO 5718-2:2023 (Blades for Large Rotary Mowers)

Key topics and technical requirements

Applications - who uses this standard

Related standards

Related standards

Abstract

Overview - ISO 5718-2:2023 (Blades for Large Rotary Mowers)

Key topics and technical requirements

Applications - who uses this standard

Related standards

Related standards

Agricultural machinery — Safety — Part 13: Large rotary mowers

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Metallic materials - Rockwell hardness test - Part 1: Test method (ISO 6508-1:2023)

Intelligent transport systems - Traffic and travel information messages via traffic message coding - Part 2:…

Metallic materials - Designation of test specimen axes in relation to product texture (ISO 3785:2023)

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