Overview - ISO 3245:2023 (Rolling bearings, drawn cup needle roller bearings)
ISO 3245:2023 specifies the boundary dimensions, preferred sizes and geometrical product specifications (GPS) for needle roller bearings with drawn cup and without an inner ring. It covers bearings with open ends and with one closed end, defines minimum chamfer limits, closed-end thickness values, and key dimensional tolerances - notably for the needle-roller complement bore diameter (ΔFwgn) and the drawn cup width (ΔCs). This fifth edition (2023) replaces ISO 3245:2015 and adds guidance on measurement and verification (Annex B).
Key topics and technical requirements
- Nominal boundary dimensions: Preferred and boundary sizes for diameter series (1D and 2D) and for open or single-closed-end designs (tables provided in the standard).
- Tolerancing of bore diameter (ΔFwgn): Tolerance values and constraint/gauge conditions are given (Tables 4–5). Verification requires restraining the drawn cup outside diameter in a ring gauge.
- Tolerancing of drawn cup width (ΔCs): Universal tolerance for width and specification of upper/lower limits for end-thickness of profiled and flat ends (Table 6).
- Chamfer limits (r): Minimum chamfer dimensions are defined; upper limits are not specified.
- GPS framework: The standard is a machine-element geometry standard in the GPS system and follows ISO/GPS rules (ISO 8015, ISO 14405-1) and decision rules (ISO 14253-1). Measurement uncertainty recommendations reference ISO 14253-2.
- Annexes:
- Annex A (informative) - suggested tolerances for shaft raceway and housing bore (fit and press-in guidance).
- Annex B (informative) - measurement and verification methods for the specific characteristics.
Practical applications and intended users
ISO 3245:2023 is essential for:
- Bearing manufacturers - to design and produce drawn-cup needle bearings to consistent boundary and tolerance limits.
- Design engineers (machines/OEMs) - to specify bearing dimensions, mating shaft raceways and housing bores for reliable fits and function.
- Quality, inspection and metrology teams - for defining gauge methods, measurement procedures and acceptance criteria.
- Purchasing and standards engineers - to ensure interchangeability and compliance in procurement and supplier specifications.
Practical uses include specifying mating tolerances, designing ring gauges, defining inspection plans, and ensuring functional fits for high-density radial bearing arrangements.
Related standards (normative references)
- ISO 5593 - Rolling bearings vocabulary
- ISO 10579 - GPS - Dimensioning and tolerancing for non‑rigid parts
- ISO 14405-1 - GPS - Dimensional tolerancing (linear sizes)
- ISO/TS 17863 - GPS - Tolerancing of movable assemblies
Keywords: ISO 3245:2023, needle roller bearings, drawn cup, without inner ring, boundary dimensions, GPS, tolerances, ΔFwgn, ΔCs, chamfer, bearing inspection.
Open preview (PDF)Rolling bearings — Needle roller bearings with drawn cup and without inner ring — Boundary dimensions, geometrical product specifications (GPS) and tolerance values
