Internal combustion engines—Piston rings—Part 9:Keystone rings made of cast iron
IDT ISO 6624-1:2001
全国内燃机标准化技术委员会(SAC/TC 177)
GB/T 1149的本部分规定了活塞环型号为T、TB、TBA、TM、K、KB、KBA和KM的梯形铸铁活塞环（以下简称梯形铸铁环）的基本尺寸特征。
本部分适用于气缸直径从70 mm到200 mm的往复式内燃机用的梯形铸铁环。
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