ISO 9788:2017规定了双螺柱系紧配件组件的几何结构、性能和测试要求，当安装在符合ISO 7166的轨道或轨道上时，其负载能力为22 250 N（5 000 lbf）。 如果符合本文件的性能和测试要求，也可以使用规定材料以外的其他材料。 双螺柱系紧配件的用途如下: a） 将松散物品连接至空运货盘轨道或飞机地板导轨，以便与符合ISO 16049-1要求的货物约束带或符合ISO 20291-1要求的货物约束吊索（钢缆）一起构成系紧装置， b） 或符合ISO 4115或ISO 4170要求的托盘网的永久连接系紧组件。 在这种情况下，如果认为合适，螺柱几何形状也可以符合ISO 7166，断裂强度要求可以限制为满足ISO 21100规定的网络适航性批准/认证所需的值。 本文件不包括单螺柱系紧配件。 然而，在认为合适的情况下，它们可以使用相同的螺柱几何形状，以替代适用ISO 7166中规定的螺柱配置。

ISO 9788:2017 specifies the geometry, performance and testing requirements for a double stud tie-down fitting assembly, having a load capacity of 22 250 N (5 000 lbf), when installed in rail or track conforming to ISO 7166. Other materials than those specified can alternatively be used, provided the performance and testing requirements of this document are complied with. Double stud tie-down fittings are intended to be used as either: a) loose items to be attached to an air cargo pallet's track or an aircraft's floor rail in order to constitute a tie-down arrangement together with cargo restraint straps meeting the requirements of ISO 16049-1 or cargo restraint slings (steel cables) meeting the requirements of ISO 20291-1, b) or permanently attached tie-down components of pallet nets meeting the requirements of ISO 4115 or ISO 4170. In this case, where deemed appropriate, the stud geometry can alternatively conform to ISO 7166, and the breaking strength requirement can be limited to the value necessary to meet the net's airworthiness approval/certification in accordance with ISO 21100. Single stud tie-down fittings are not covered by this document. They nevertheless can, where deemed appropriate, use the same stud geometry alternatively to the stud configuration specified in applicable ISO 7166.