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ISO 21342:2019PublishedSynchronous belt drives — Automotive belts and pulleysISO/FDIS 6621-1Under developmentInternal combustion engines — Piston rings — Part 1: Nomenclature and classificationsISO/FDIS 6624-3Under developmentInternal combustion engines — Piston rings — Part 3: Keystone rings made of steelISO/FDIS 6624-1Under developmentInternal combustion engines — Piston rings — Part 1: Keystone rings made of cast ironISO/CD 6624-2Under developmentInternal combustion engines — Piston rings — Part 2: Half keystone rings made of cast ironISO/CD 6624-4Under developmentInternal combustion engines — Piston rings — Part 4: Half keystone rings made of steelISO/DIS 18669-1Under developmentInternal combustion engines — Piston pins — Part 1: General specificationsISO/DIS 18669-2Under developmentInternal combustion engines — Piston pins — Part 2: Inspection measuring principlesISO 2790:2004WithdrawnBelt drives — V-belts for the automotive industry and corresponding pulleys — DimensionsISO 2790:1989WithdrawnBelt drives — Narrow V-belts for the automotive industry and corresponding pulleys — DimensionsISO 2790:1982WithdrawnNarrow V-belt drives for the automotive industry — DimensionsISO 5287:2003WithdrawnBelt drives — Narrow V-belts for the automotive industry — Fatigue testISO 5287:1985WithdrawnNarrow V-belt drives for the automotive industry — Fatigue testISO 5287:1978WithdrawnNarrow V-belt drives for the automotive industry — Fatigue testISO 6621-4:2015WithdrawnInternal combustion engines — Piston rings — Part 4: General specificationsISO 6621-5:2013WithdrawnInternal combustion engines — Piston rings — Part 5: Quality requirementsISO 6621-1:2007WithdrawnInternal combustion engines — Piston rings — Part 1: VocabularyISO 6621-5:2005WithdrawnInternal combustion engines — Piston rings — Part 5: Quality requirementsISO 6621-4:2003WithdrawnInternal combustion engines — Piston rings — Part 4: General specificationsISO 6621-2:2003WithdrawnInternal combustion engines — Piston rings — Part 2: Inspection measuring principlesISO 6621-3:2000WithdrawnInternal combustion engines — Piston rings — Part 3: Material specificationsISO 6621-4:1988WithdrawnInternal combustion engines — Piston rings — Part 4: General specificationsISO 6621-5:1988WithdrawnInternal combustion engines — Piston rings — Part 5: Quality requirementsISO 6621-1:1986WithdrawnInternal combustion engines — Piston rings — Part 1: VocabularyISO 6621-2:1984WithdrawnInternal combustion engines — Piston rings — Part 2: Inspection measuring principles