Overview
ISO 4002-1:1979 - Equipment for sowing and planting - Part 1: Concave disks type D1 - Dimensions defines the dimensional requirements for concave disks used in sowing and planting machines. The standard establishes the official geometry and tolerances for concave disks (type D1), with or without a central hole, to ensure compatibility and interchangeability across agricultural machinery and seeders.
Key topics
- Scope and applicability: Dimensions for concave disks used in sowing and planting equipment (type D1).
- Dimensional parameters defined: outside diameter, central-hole diameter (if present), fixing-hole diameter, pitch circle diameter, disk thickness, height of concavity (t) and radius of concavity (R).
- Sizes covered: a tabulated set of dimensions for Sizes I to IV (values given in millimetres in the standard).
- Fixing and positional tolerances:
- Fixing-hole centre tolerance: within 0.2 mm diameter of true position.
- Radius of concavity tolerance: +5% of R.
- Reference notes: dimension t is given for reference in the table.
- Illustrations: figure shows section views and labels for the various dimensions to aid interpretation.
Applications
ISO 4002-1:1979 is intended for:
- Manufacturers of sowing and planting machines and replacement disks - to produce components to a recognized dimensional standard.
- Design engineers specifying disk geometry for seeders and planters to ensure fit and performance.
- Parts suppliers and distributors ensuring replacement concave disks meet dimensional and tolerance requirements.
- Quality control and inspection teams verifying conformity of disk parts to specified tolerances.
- Procurement and maintenance departments seeking interoperable parts for agricultural machinery fleets.
Benefits include improved interchangeability of disks between machines, predictable performance of seeding equipment, simplified maintenance and spare-parts sourcing, and compliance with an internationally recognized dimensional reference.
Related standards and context
- Developed by ISO/TC 23 (Tractors and machinery for agriculture and forestry).
- ISO 4002-1 is Part 1 of the disks series; consult the ISO catalogue or national standards bodies for related parts or subsequent revisions.
Keywords: ISO 4002-1:1979, concave disks, sowing and planting, seeders, agricultural machinery, disk dimensions, fixing holes, pitch circle diameter, radius of concavity, tolerance.
