ISO 3547-2:2023

Overview

ISO 3547-2:2023 - "Plain bearings - Wrapped bushes - Part 2: Test data for outside and inside diameters" defines required test data and test designations for measuring outside and inside diameters of wrapped bushes (mono- and multi-layer bearing materials) used in plain bearing applications. The standard specifies test methods, calculation bases (including elastic reduction and checking load), and rules for presenting measurement data on drawings. It clarifies that wall thickness is measured in the free (uninstalled) condition, so no special wall‑thickness test data are required on drawings.

Keywords: ISO 3547-2, plain bearings, wrapped bushes, outside diameter, inside diameter, test data, checking load, checking block, ring gauge

Key Topics and Requirements

• Scope and applicability
  • Applies to wrapped bushes made from mono- and multi-layer bearing materials.
  • Test A is applicable for outside diameters up to 180 mm.
• Tests defined
  • Test A - Check outside diameter with a checking block and setting plug; record indicator change Δz and compute D using elastic reduction v.
  • Test B - Check outside diameter using two ring gauges.
  • Test C - Check inside diameter of a bush pressed into a ring gauge.
  • Test D - Check outside diameter using a precision measuring tape.
• Elastic reduction (v)
  • Specified v values under checking load F by nominal D range:
    • D ≤ 6 mm: v = 0.003 mm

    • 6 ≤ 12 mm: v = 0.006 mm

    • 12 ≤ 80 mm: v = 0.013 mm

    • 80 ≤ 180 mm: v = 0.025 mm

  • Checking block diameter d_ch is calculated as d_ch = D_o,max − v.
• Checking load calculation
  • Based on effective cross-sectional area A_cal (depends on material designation and nominal dimensions).
  • Multipliers for F_ch (per Table 5): 1 500, 3 000, 6 000 or 12 000 N/mm depending on D_o range (rounded to nearest specified increment).
• Drawing requirements
  • Drawings should show either: outside diameter (D_o) + wall thickness (s), or outside diameter (D_o) + inside diameter (D_i). Do not specify wall thickness and inside diameter together.
• Measurement guidance
  • Measure wall thickness away from localized depressions, lubrication holes, grooves or bore indentations that can cause distortion.

Applications and Who Uses It

• Manufacturers and quality engineers of plain bearings and wrapped bushes use ISO 3547-2 to:
  • Define inspection procedures and test data for production and incoming inspection.
  • Calculate checking loads and select appropriate gauges and test rigs.
  • Prepare technical drawings with compliant measurement specifications.
• Design engineers, metrology labs, and procurement teams requiring consistent acceptance criteria for bush diameters will also rely on this standard.

Related Standards (applicable)

• ISO 3547-1: Dimensions
• ISO 3547-4: Materials
• ISO 3547-5 / ISO 3547-6: Test rig and wall-thickness guidance
• ISO 286-2, ISO 4378 series, ISO 12301, ISO 13715

Using ISO 3547-2 ensures consistent, repeatable diameter testing of wrapped bushes and helps integrate bearing components into robust quality and design workflows.