Overview
ISO 20562:2014 - "Tyre valves - ISO core chambers No. 1, No. 2, No. 3 and No. 4" specifies the interchangeability dimensions and tolerances for four standard ISO core chambers used in tyre valves. Published as the second edition in 2014, this standard defines the internal geometry, thread interfaces and pin-head position tolerances needed to ensure compatibility between valve bodies and replaceable valve cores.
Key topics and technical requirements
- Scope: Dimensions and tolerances for ISO core chambers Nos. 1, 2, 3 and 4; applicability guidance refers users to ISO 9413.
- Dimensional tables: Each core chamber (No. 1–4) has a dedicated table of nominal dimensions (see standard) covering bore sizes, thread length method, and key axial/diameter limits.
- Angles and geometry: The seating/seat angle α is specified (16° to 18°) for the core chambers.
- Threading and gauges: Thread types referenced (e.g., 5V1, 8V1 per ISO 4570) and the length of thread is determined using a GO thread plug gauge in accordance with ISO 1502.
- Core pin head tolerances: Acceptable pin-head positions relative to the valve mouth are defined (specific limits and tolerances illustrated in figures).
- Insertion torque guidance: Torque ranges for correct core insertion and sealing are provided depending on sealing gasket type:
- Core chambers No. 1, 3, 4: elastomeric gasket 0.17–0.34 N⋅m; metallic gasket 0.34–0.54 N⋅m.
- Core chamber No. 2 (large bore): elastomeric gasket 0.34–0.56 N⋅m; metallic gasket 0.60–0.80 N⋅m.
- Optional counterbore: Counterbore dimensions for valve mouths are given in informative Annex A (counterbore optional).
Applications and who uses it
ISO 20562:2014 is intended for:
- Valve and core manufacturers designing interchangeable valve cores and valve bodies.
- Tyre, rim and wheel OEMs ensuring component compatibility across markets.
- Quality, inspection and test labs using specified gauges and tolerances for acceptance criteria.
- Maintenance and service organizations selecting correct replacement cores and verifying sealing/tightening practices.
- Industry designers for applications ranging from passenger and bent valves to large-bore valves for agricultural machinery, earth-moving equipment, and civil aircraft.
Practical benefits include improved interchangeability, reduced service errors, consistent sealing performance, and easier aftermarket replacement of valve cores.
Related standards
- ISO 9413 - Tyre valves: dimensions and designation (applicability of core chambers)
- ISO 4570 - Tyre valve threads (thread specifications such as 5V1, 8V1)
- ISO 1502 - GO thread plug gauge procedures (used to determine thread length)
Keywords: ISO 20562:2014, tyre valves, ISO core chambers, core chamber dimensions, interchangeability, valve cores, valve mouth, ISO 9413, ISO 4570, thread gauges, tolerances.