KS ISO 6624-3:2001

Internal combustion engines - Piston rings - Part 3: Keystone rings made of steel.

Specifies the essential dimensional features of keystone rings made of steel, types T, TB, TBA, TM, K, KB, KBA and KM, having diameters of from 70 mm up to and including 160 mm, used in reciprocating internal combustion piston engines