ISO 12132:2017

Overview - ISO 12132:2017 (Design FMEA for thin-walled half bearings)

ISO 12132:2017 provides guidance for preparing a Design FMEA specifically for thin-walled half bearings used in machinery (for example, internal combustion engines). The standard lists common potential failure modes, their effects and likely causes, and emphasizes system-level interactions (lubrication, crankshaft, engine block, connecting rods, etc.). It does not include numeric risk ratings (occurrence, severity, detection) because these are application- and customer-specific. Process FMEA remains the supplier’s responsibility. IEC 60812 and ISO 7146 series are referenced for methods and damage characterization.

Key topics and technical focus

• Purpose: Guidance for performing a Design FMEA for plain bearing design and quality assurance.
• FMEA elements: failure mode, failure effect, failure cause - organized for half bearing shells.
• Common failure modes documented (table-based):
  • Fatigue (reduced durability, seizure)
  • Accelerated wear (insufficient oil film, embeddability issues)
  • Scuffing/over‑heating (excessive clearance, poor running-in)
  • Excessive localized wear (features like grooves, holes affecting pressure)
  • Bearing back damage (interference-fit and housing issues)
  • Corrosion (lubricant, coolant, fuel contamination)
  • Cavitation erosion (overlay and groove-related problems)
• Typical causes cited: material selection, journal/housing geometry, improper clearances, inadequate lubrication or filtration, oil supply design, housing stiffness and alignment, thermal expansion, contamination.
• Methodology note: Numerical risk scoring is to be determined by the designer/manufacturer per IEC 60812 and company/customer criteria.

Practical applications and users

Who uses ISO 12132:2017:

• Design engineers and mechanical engineers working on engine and machinery bearing systems
• Reliability and quality assurance teams preparing Design FMEAs
• OEMs and Tier‑1 suppliers specifying bearing requirements
• Failure analysis and maintenance engineers diagnosing bearing damage

Practical uses:

• Structuring Design FMEA sessions to identify bearing-specific risks
• Prioritizing design changes (material, geometry, oil supply, tolerances)
• Informing test plans, inspection points and supplier quality requirements
• Clarifying responsibilities between OEM design (Design FMEA) and supplier processes (Process FMEA)

Related standards

• IEC 60812 - Procedure for FMEA
• ISO 7146-1 and ISO 7146-2 - Appearance/characterization of damage and cavitation erosion in hydrodynamic bearings

Keywords: ISO 12132:2017, Design FMEA, thin-walled half bearings, plain bearings, quality assurance, failure modes, bearing design, lubrication, bearing wear, cavitation erosion.