本标准规定了拟与1/4英寸20螺纹和3/8英寸16螺纹锁紧螺钉配合的电影和电视摄像机安装板中头部安装插座的位置。除影响互换性的尺寸外，本标准无意规定设计；因此，插座图显示了许多可能设计中的两种。

This standard specifies the location of the head mounting sockets in the mounting plates of motion-picture and television cameras intended to mate with 1/4-inch-20 thread and 3/8-inch-16 thread locking screws.The standard is not intended to prescribe design except for the dimensions affecting interchangeability; for this reason, the socket figures indicate two of many possible designs.