ISO 11891:2012 PDF

Scope: This International Standard specifies the materials, shapes, spring characteristics, tolerances, manufacturing requirements and test methods for common helical compression springs, which are made from hot coiled round section steel bar, and then quenched and tempered (hereinafter simply “springs”). The following limit values apply to springs conforming to this International Standard: — free length: ≤ 900 mm; — spring index: 3 to 12; — slenderness ratio: 0,8 to 4; — active coils: ≥ 3; — spring pitch: < 0,5D; — wire diameter: 8 mm to 60 mm; — mean diameter of coil: ≤ 460 mm. This International Standard is not applicable to coil springs with special performance requirements, such as railway and automotive suspensions.

ISO 11891:2012 Referenced Document

ISO 18265 Metallic materials.Conversion of hardness values*， 2013-10-01 Update
ISO 26909 Springs - Vocabulary
ISO 643 Steels — Micrographic determination of the apparent grain size*， 2020-03-01 Update
ISO 7500-1 Metallic materials - Calibration and verification of static uniaxial testing machines - Part 1: Tension/compression testing machines - Calibration and verification of the force-measuring system*， 2018-02-01 Update

2012 ISO 11891:2012 Hot formed helical compression springs - Technical specifications