Technical Approach In general, the ring is inserted in a groove incorporated in the piston and presses against the cylinder. It fulfils a sealing function between the pressurised and non-pressurised volumes and may also comprise a cylinder oil wiper.
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Ring characteristics

Metal
Transversal cross-section
Peripheral surface
Edges and lips
Plating
Spring...

Edges and lips

Peripheral edges chamfered
Inside edges chamfered
Internal bevel
Internal stepped

Main types of rings

Rectangular
"L" shaped
Barelled
Keystone...

few piston rings

Nomenclature of a piston ring

d₁	h₁	da₁	s₁
Nominal diameter	Axial height	Radial thickness	Cutting gap

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Piston ring cuts

Straight Joint
Right hand angle Joint
Step cut
Hook Joint...

Ring materials

FGL F5 - F30 - F51 - F52 - F63 - F54 - F56 - F57 - F68
Z170CS
Z200CD
S6-5-2 ; UE12