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ISO 6621-2:2020 Internal combustion engines - Piston rings - Part 2: Inspection measuring principles >
ISO 6621-2:2020 Internal combustion engines - Piston rings - Part 2: Inspection measuring principles, 2020
- Foreword
- Introduction
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Measuring principles
- 4.1 General measuring conditions
- 4.2 Characteristics and measuring principles
- 4.2.1 Ring width
- 4.2.2 Radial wall thickness, a1
- 4.2.3 Total free gap m, p
- 4.2.4 Closed gap, s1
- 4.2.5 Tangential force, Ft (in Newton)
- 4.2.6 Diametral force, Fd (in Newton)
- 4.2.7 Ovality, U (in millimetres)
- 4.2.8 Point deflection, W (in millimetres)
- 4.2.9 Light tightness (percentage of ring circumference)
- 4.2.10 Taper on peripheral surface (in micrometres or degrees)
- 4.2.11 Barrel on peripheral surface, t2, t3 (in millimetres)
- 4.2.12 Land width, h4, h5 (in millimetres)
- 4.2.13 Land offset (in millimetres)
- 4.2.14 Plating/coating thickness (in millimetres)
- 4.2.15 Nitrided case depth (in millimetres)
- 4.2.16 Keystone angle (in degrees)
- 4.2.17 Obliqueness (in degrees)
- 4.2.18 Twist (in millimetres)
- 4.2.19 Unevenness Ter, Teu
- 4.2.20 Helix (axial displacement of gap ends) (in millimetres)
- 4.2.21 Free flatness (in millimetres)
- 4.2.22 Surface roughness Ra, Rz (in micrometers)
- 4.2.23 Circumferential waviness — Bottom side face (in micrometres)
- Bibliography [Go to Page]