ISO 1005-2:1986

Overview

ISO 1005-2:1986 - "Railway rolling stock material - Part 2: Tyres, wheel centres and tyred wheels for tractive and trailing stock - Dimensional, balancing and assembly requirements" defines the dimensional, surface finish, balancing and manufacturing/assembly requirements for railway tyres, wheel centres and assembled tyred wheels. It sets tolerances, surface roughness targets, permissible residual static unbalance rules and assembly practices (shrink-fit, retaining rings, oil-grooves) while referencing quality and delivery requirements in related parts of ISO 1005 and ISO 404.

Key topics and technical requirements

• Dimensional requirements
  • Specifies tolerances for unmachined, rough‑machined, half‑finished, finished and “ready for assembly” conditions for tyres, wheel centres and tyred wheels.
  • Final bore and rim dimensions for finished and ready‑for‑assembly states are controlled to ensure wheelset tolerances after axle assembly.
• Surface roughness
  • Machined surfaces in finished/ready conditions have defined arithmetic mean deviation (Ra) limits; for example, tyre bores and machined rim interface targets are in the low micrometer range (bore Ra < 3.2 µm is required for many applications).
  • Alternative roughness parameters (e.g., Rmax) may be used only by agreement between parties.
• Balancing and static unbalance
  • Permissible residual static unbalance is specified and depends on operating speed and application (tractive vs trailer stock). The standard prescribes marking conventions and correction methods (per ISO 1005‑4) and requires the position/amount of unbalance to be indicated when specified.
• Assembly and manufacturing practice
  • Shrink‑fit assembly procedures: tyre heating limits (not to exceed 300 °C) and rolling down of tyre lips (final rolling at ≤ 200 °C).
  • Retaining rings must be used in rolled condition, ends squared or scarfed as specified; allowed gap after assembly ≤ 3 mm.
  • Oil injection grooves and associated threaded holes are machined to purchaser drawings where required.
  • Interference‑fit sizing is controlled by a formula in the standard using a factor x (typically 1.1–1.5) to account for design and stiffness.

Practical applications and users

ISO 1005-2 is used by:

• Wheelset and wheel manufacturers to define production tolerances, surface finish and assembly processes.
• Rolling stock OEMs and component purchasers to specify acceptance criteria in procurement documents.
• Maintenance and overhaul workshops for repair, remachining and reassembly of tyred wheels.
• Quality assurance and inspection teams verifying conformity to dimensional, roughness and balancing requirements.
• Regulators and safety assessors referencing standardized assembly and balancing practices.

Related standards

• ISO 1005‑1, ISO 1005‑4 - quality requirements for tyres and wheel centres
• ISO 1005 parts 6 & 7 - related wheel and wheelset specifications
• ISO 404 - general technical delivery requirements for steel products
• ISO 468 - surface roughness parameters and specification rules
• ISO 1101 - geometrical tolerancing

Keywords: ISO 1005-2:1986, railway rolling stock material, tyred wheels, wheel centres, tyres, dimensional requirements, surface roughness, static unbalance, assembly requirements, wheel manufacturing.