规定了用于提升货物集装箱或其他装有ISO角配件的设备的提升架的固定式和浮动式中心扭锁头以及柄部相邻部分的尺寸、材料试验要求和标记。附录解释了计算间距尺寸和公差的依据，并给出了设计、选择和使用指南。交叉引用:BS 970:第1BS 1936部分:第2BS 3951部分:第1部分:第1.1BS 3951节:第1部分:第1.2节

Specifies dimensions, materials test requirements and marking for fixed and floating centre twistlock heads, and adjacent portions of the shank, used in lifting frames to lift freight containers or other equipment filled with ISO corner fittings. Appendices explain the basis on which the spacing dimensions and tolerances were calculated, and give guidance on the design, selection and use.Cross References:BS 970:Part 1BS 1936:Part 2BS 3951:Part 1:Section 1.1BS 3951:Part 1:Section 1.2