IEC 61076-2-011:20 21描述了通常用于工业过程测量和控制的圆形连接器的卡口耦合接口。这些连接器由可重新接线或不可重新接线的固定和自由连接器组成，带有卡口连接。这些连接器可以具有玻璃到金属的密封插入件。它们具有公触头或母触头，并且被认为可以与根据本文件生产的相应自由连接器互配。公接头有圆形触点？0.6毫米，？0.76毫米，？0.8毫米和？1.0毫米。 不同的编码防止这些单独编码的固定连接器(并且因此防止被认为与其耦合的单独编码的自由连接器)与其他接口的配合以及不同编码之间的交叉配合。然而，除了耦合机制之外，样式和接口尺寸如4所示。IEC 61076-2-101:2012第3条和IEC 61076-2-109:2014第4.3.1条。 公型B12圆形连接器可与具有相同编码和方式的母型B12连接器互操作。母型B12连接器可与具有相同编码和方式的公型B12和M12（螺纹联接）连接器互操作。

IEC 61076-2-011:2021 describes the bayonet coupling interface of circular connectors that are typically used for industrial process measurement and control. These connectors consist of fixed and free connectors either rewireable or non-rewireable, with bayonet-coupling. These connectors may have glass to metal seal inserts. They have male or female contacts and are deemed to be intermateable with corresponding free connectors produced according to this document. Male connectors have round contacts？0,6 mm,？0,76 mm,？0,8 mm and？1,0 mm.
Different codings prevent the mating of these individually coded fixed connectors (and consequently of individually coded free connectors deemed to couple with them) to other interfaces and cross-mating between the different codings. However, the styles and interface dimensions, except for the coupling mechanism, are as given in 4.3 of IEC 61076-2- 101:2012 and 4.3.1 of IEC 61076-2-109:2014.
The male type B12 circular connectors are interoperable with the female type B12 connector of the same coding and ways. The female type B12 connectors are interoperable with the male type B12 and M12 (threaded screw coupling) connector of the same coding and ways.