本部分规定了火花点火发动机用插座式连接的基本尺寸。适用于“A”型高压插座和电缆连接器（图1和图2）。附录给出了“B”型插座和连接器（图3和图4）。第一版取消并取代ISO 3553:1975。

This part specifies the essential dimensions of socket-type connections, used for spark-ignition engines. Applies to high-tension sockets and cable connectors of type "A" (figures 1 and 2). An annex gives socket and connector type "B" (figures 3 and 4). This first edition cancels and replaces the ISO 3553:1975.