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Differences, where they exist, are shown in Appendix A. This SAE Standard specifies the essential dimensional features of HK- and HKB-half keystone rings with narrow ring width types. Dimensional and allow for the use of cast iron (Table 6) or steel (Table 7). Since the modulus of elasticity of steel rings is higher than that of cast iron rings, the fluctuation in the surface pressure will become greater if the free gap is set as the reference for forces. Therefore, forces are set using the surface pressure as the reference in order to minimize the effect of the fluctuation. The requirements of this document apply to half keystone rings of reciprocating internal combustion engines up to and including 70 mm diameter for cast iron rings and up to and including 100 mm diameter for steel rings.

Differences, where they exist, are shown in Appendix A. This SAE Recommended Practice specifies the essential dimensional features of HK- and HKB- half keystone rings with narrow ring width types. Dimensional Tables 6 and 7 allow for the use of cast iron (Table 6) or steel (Table 7). Since the modulus of elasticity of steel rings is higher than that of cast iron rings, the fluctuation in the surface pressure will become greater if the free gap is set as the reference for forces. Therefore, forces are set using the surface pressure as the reference in order to minimize the effect of the fluctuation. The requirements of this document apply to half keystone rings of reciprocating internal combustion engines up to and including 70 mm diameter for cast iron rings and up to and including 100 mm diameter for steel rings.

Differences, where they exist, are shown in Appendix A. This SAE Standard specifies the essential dimensional features of T, TB, TM, K, KB, and KM keystone piston ring types. The requirements of this document apply to compression rings for reciprocating internal combustion engines up to and including 200 mm diameter.

Differences, where they exist, are shown in Appendix A. This document specifies the essential dimensional features of N, NM, E, and EM scraper piston ring types. Dimensional Tables 7 and 8 offer the choice of two radial wall thicknesses: a radial wall thickness "regular" (Table 7); b radial wall thickness "D/22" (Table 8). The requirements of this document apply to scraper rings for reciprocating internal combustion piston engines up to and including 200 mm diameter. They may also be used for piston rings of compressors working under similar conditions.

Differences, where they exist, are shown in Appendix A. This SAE Standard specifies the essential dimensional features of R, B, and M rectangular piston ring types. Dimensional Tables 8 and 9 offer the choice of two radial wall thicknesses: a Radial wall thickness "regular" (Table 8) b Radial wall thickness "D/22" (Table 9) The requirements of this document apply to rectangular rings for reciprocating internal combustion piston engines up to and including 200 mm diameter. They may also be used for piston rings of compressors working under similar conditions.

Differences, where they exist, are shown in Appendix A. This document specifies the essential dimensional features of R, B, and M rectangular piston ring types. Dimensional Tables 8 and 9 offer the choice of two radial wall thicknesses: a radial wall thickness "regular" (Table 8) b radial wall thickness "D/22" (Table 9) The requirements of this document apply to rectangular rings for reciprocating internal combustion piston engines up to and including 200 mm diameter. They may also be used for piston rings of compressors working under similar conditions.

Differences, where they exist, are shown in Appendix A. This SAE Standard specifies the essential dimensional features of R, B, and M rectangular piston ring types with narrow ring width. Dimensional Tables 8 and 9 allow for the use of cast iron (Table 8) or steel (Table 9). Since the modulus of elasticity of steel rings is higher than that of cast iron rings, the fluctuation in the surface pressure will become greater if the free gap is set as the reference for force. Therefore, forces are set using the surface pressure as the reference, in order to minimize the effect of the fluctuation. The requirements of this document apply to rectangular rings for reciprocating internal combustion engines up to and including 90 mm diameter for cast iron rings and up to and including 100 mm diameter for steel. They may also be used for piston rings of compressors working under similar conditions.

This document covers the mechanisms associated with the power cylinder which might affect blow-by. It will not discuss in detail the blow-by mechanisms from other engine subsystems.

Differences, where they exist, are shown in Appendix A. This SAE Standard specifies the quality aspects that are capable of definition but not normally found on a drawing specification. The difficulty of trying to define in absolute terms the quality attainable in normal commercial manufacture of piston rings is well known. In this document the commonly encountered aspects of quality in terms of casting defects and other departures from ideal are quantified. Many minor defects are clearly quite acceptable; other defects because of size or numbers are inadmissible.

Differences, where they exist, are shown in Appendix A. This document specifies the quality aspects that are capable of definition but not normally found on a drawing specification. The difficulty of trying to define in absolute terms the quality attainable in normal commercial manufacture of piston rings is well known. In this document the commonly encountered aspects of quality in terms of casting defects and other departures from ideal are quantified. Many minor defects are clearly quite acceptable; other defects because of size or numbers are inadmissible. This document covers the following: a Single piece piston rings of grey, carbidic, malleable, spheroidal graphite cast iron or steel; b Multipiece piston rings (oil control rings) consisting of cast iron parts and spring components; c Single piece and multipiece rings of steel, i.e., oil control rings in the form of strip steel components or steel segments (rails) with spring expander components.

Differences, where they exist, are shown in Appendix A. This SAE Recommended Practice specifies the general characteristics of piston rings and individual dimensional criteria, which are specified as appropriate in the documents in Section 2. This document also provides a system for coding, designation, and marking of piston rings. This document applies to the manufacture of piston rings up to and including 200 mm diameter for reciprocating internal combustion engines. It also applies to piston rings for compressors working under similar conditions.

Differences, where they exist, are shown in Appendix A. This SAE Standard specifies the general characteristics of piston rings and individual dimensional criteria, which are specified as appropriate in the documents in Section 2. This document also provides a system for coding, designation, and marking of piston rings. This document applies to the manufacture of piston rings up to and including 200 mm diameter for reciprocating internal combustion engines. It also applies to piston rings for compressors working under similar conditions.

Differences, where they exist, are shown in Appendix A. This SAE Standard specifies the general characteristics of piston rings and individual dimensional criteria, which are specified as appropriate in the documents in Section 2. This document also provides a system for coding, designation, and marking of piston rings. This document applies to the manufacture of piston rings up to and including 200 mm diameter for reciprocating internal combustion engines. It also applies to piston rings for compressors working under similar conditions.

There is no ISO standard equivalent to this SAE Standard. This SAE standard identifies and defines the most commonly used terms for piston ring-groove characteristics, specifies dimensioning for groove widths, and demonstrates the methodology for calculation of piston groove root diameter. The requirements of this document apply to pistons and rings of reciprocating internal combustion engines and compressors working under analogous conditions, up to and including 200 mm diameter and 4.5 mm width for compression rings and 8.0 mm width for oil rings. The specifications in this document assume that components are measured at an ambient temperature of 20 °C (68 °F). Tolerances specified in this document represent a six sigma quality level.