BS ISO 6621-2:2003
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
Internal combustion engines. Piston rings Inspection measuring principles
Hardcopy , PDF
04-26-2022
English
01-07-2004
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Measuring principles
4.1 General measuring conditions
4.2 Ring characteristics and their measurement
4.2.1 Ring width (in millimetres)
4.2.2 Radial wall thickness, a[1] (in millimetres)
4.2.3 Total free gap m, p (in millimetres)
4.2.4 Closed gap, s[1] (in millimetres)
4.2.5 Tangential force, F[t] (in newtons)
4.2.6 Diametral force, F[d] (in newtons)
4.2.7 Ovality, U (in millimetres)
4.2.8 Point deflection, W (in millimeters)
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, t[2], t[3]
(in millimetres)
4.2.12 Land width, h[4], h[5] (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 T[er], T[eu]
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 micrometres)
Bibliography
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