ISO 5711:1995 PDF

Overview

ISO 5711:1995 - "Tractors and machinery for agriculture and forestry - Wheel-to-hub fixing dimensions" specifies dimensional requirements for attaching wheels to hubs on tractors and agricultural and forestry machinery. The standard defines wheel-to-hub interface geometry (study circle, stud holes, central bore, bearing and centring diameters) and presents recommended forms of attachment. It clarifies that specified dimensions do not guarantee interchangeability between different vehicles.

Key topics and technical requirements

• Scope and intent

  • Dimensional requirements for wheel-to-hub fixing on tractors and agricultural/forestry machinery.
  • Units and figures are given in millimetres; chamfering and seating details are included.

• Primary interface features covered

  • PCD (pitch circle diameter) of stud/nut seating.
  • Stud hole diameter and seating types.
  • Central bore diameter for hub centring.
  • Disc flat bearing diameter and hub flat bearing diameter.
  • Centring diameter on the hub and countersunk/spherical radii where applicable.
  • Chamfer and seating edge preparations.

• Attachment types

  • Flat attachment with centring on a central bore is the recommended attachment type for future equipment (principal method).
  • Attachments with spherical or conical stud-hole centring are included in Annex A for information only and are not recommended for future applications.
  • Tables and figures specify dimensions for various numbers of stud holes (e.g., 4, 5, 6, 8, 10, 12) and related seating geometry.

• Limitations and notes

  • The standard explicitly states that specified dimensions do not imply interchangeability between vehicles.
  • Wheels fitted to driven axles incorporating gear reduction within the hub envelope are outside the scope.

Applications and who uses it

ISO 5711:1995 is intended for:

• Wheel and hub designers and OEM engineers creating tractor and forestry machinery wheel interfaces.
• Manufacturers of wheels, hubs, studs and nuts who require standardised fixing dimensions.
• Maintenance, inspection and aftermarket service teams performing wheel replacements, retrofits or compatibility checks.
• Procurement and quality assurance teams specifying interface dimensions in technical procurement documents.

Practical uses include design validation, manufacturing tolerances, spare‑parts specification, and ensuring safe wheel mounting and centring on agricultural and forestry vehicles.

Related standards

• Prepared by ISO/TC 23 (Tractors and machinery for agriculture and forestry), Subcommittee SC 4 (Tractors).
• Complementary guidance may be found in other ISO standards covering vehicle wheels, fasteners and tractor safety; consult ISO catalogues for the most current related publications.

Keywords: ISO 5711:1995, wheel-to-hub fixing dimensions, tractors, agricultural machinery, forestry equipment, PCD, stud holes, central bore, flat attachment, hub dimensions.