·  Run‑in: 4 hours at 20% rated speed, check for powder release.

·  Sudden vibration increase (acceleration >10 g) indicates unstable cage wear.

·  Correction: multiply calculated speed by 0.9 (oil lubrication) or 0.8 (grease lubrication).

·  Not water‑resistant, not high‑temperature resistant (long‑term <110°C).

·  Brittle - can fracture under shock loads.

·  Lubricant must be compatible with phenolic resin (avoid certain synthetic oils containing esters).

·  Manufacturers provide speed limit curves (dn value charts) - they can be used for calculation.

·  No standard life model - typically estimate as half the designed bearing life.

·  Very high speed bearings (precision machine tool spindles, angular contact ball bearings).

·  Low density, low centrifugal forces, flexible.

·  Typical grades: M208, M209 (FAG), BX (SKF).

·  Pre‑soak cage in target humidity and temperature for 24 hours, measure pocket dimensional change.

·  Cage material must be compatible with the lubricant. 

·  Strict temperature limit: -30°C to +110°C (short‑term 120°C).

·  Hygroscopic – dimensional changes (0.2-0.5% size increase per 1% moisture uptake) may cause interference.

·  Not for vacuum (outgassing) or strong acids/alkalis.

·  No widely accepted fatigue life model; moisture absorption and ageing make calculations unreliable.

·  Centrifugal deformation can be estimated, but creep cannot be quantified.

·  Speed/temperature can only be assessed using material limits - precise life prediction not possible.

·  Life: the cage is often the “weakest link” – schedule first inspection at 30-50% of calculated bearing life.

·  Field judgement: if cage crumbles or melting smell appears, stop immediately.

·  Empirical life: under rated conditions, usually no more than 15,000 hours - mandatory replacement.

·  Small‑to‑medium bearings, home appliances, automotive parts (low noise, low cost).

·  Allows slight contact between rolling elements and cage without generating metallic wear particles.

·  Some elasticity, not highly sensitive to contamination.

·  In high‑speed applications, if measured temperature rise exceeds 70°C, switch to a machined cage.

·  Temperature: material property vs. temperature curves are openly available.

·  Hand‑rotating noise: “clicking” sounds indicate pocket wear – shorten relubrication intervals.

·  Inspection: red wear debris on cage surface indicates insufficient lubrication or deformation.

·  Surface zinc or phosphate plated – limited rust resistance.

·  Relatively large clearance between rolling elements and pockets – can cause noise and friction.

·  At high speed, centrifugal force may cause deformation or fracture.

·  Load: centrifugal and inertial forces can be calculated using bearing dynamics, but stiffness scatter of pressed parts makes results uncertain.

·  Speed: limiting speed from bearing catalogues can be used, but individual cage fatigue life cannot be accurately calculated.

·  Life: no standard cage life model – usually assumed same as calculated bearing life (in reality often shorter).

·  General industrial bearings (deep groove ball bearings, cylindrical roller bearings) – low cost, high volume.

·  Moderate temperature range (-40°C to +150°C), insensitive to most lubricants.

·  Suitable for low to medium speed, moderate loads – not for very high speeds because pressed construction has poor balance.

· Alignment correction: if measured shaft tilt >50% of bearing rated angle, go to larger series or add a bearing.

· Low‑speed heavy‑load (e.g., dryer cylinders): add 5–10% MoS₂ to grease – life extension factor up to 2×.

· Life calculation requires misalignment life reduction factor.

· Use of FEA or ISO/TS 16281 tilt correction factors.

· High friction between roller spherical base and inner ring rib – needs high‑viscosity oil.

· Self‑alignment limited (typically 2°–3°), not a universal joint replacement.