本标准是在英国机械工程标准委员会的指导下制定的,用于往复式内燃机的活塞环际准类型的尺寸系列,数据采用公制单位。 本标准主要为活塞环的零件设计、材料和其他性能的合理化提供基础而制定的,它包含了内燃机工业中目前切实可行的方法。本标准代替英国标准 BS 3627,尚符合工业上的要求时,其中内燃机压缩环、油环和环槽的尺寸（采用英制单位）仍将保留。 本标准制订过程中,参考了相应的西德 This standard was developed under the guidance of the British Mechanical Engineering Standards Committee for reciprocating internal combustion engine piston ring quasi-type size series, the data using metric units. This standard is mainly for the piston ring parts design, materials and other properties to provide a rational basis for the formulation and development, it contains the internal combustion engine industry is currently practicable methods. This standard replaces the British standard BS 3627, still meet the industrial requirements, of which the compression ring, oil ring and ring groove size (in English units) will remain. This standard formulation process, the reference to the corresponding West Germany