本规范描述了测试汽车线束固定夹的方法和验收标准。固定夹是将线束或电气接头固定在特定位置的塑料零件。典型的塑料保持器的工作原理是有一组“分支”，这些“分支”可以插入一个孔中，孔的尺寸便于安装，但可以提供可接受的保持力。本规范测试了固定夹在暴露于机械和环境应力时的机械保持力，这些应力通常在汽车应用中超过15年的使用寿命。本规范有几个测试选项，以使测试与预期的使用条件相匹配。应用的可变性通常是由于夹子附近的不同环境温度、与汽车流体的不同接近度、与积水或水喷雾的不同暴露度以及夹子插入的孔的不同厚度引起的。 夹子通常插入0.6至8毫米厚的薄板或轧制金属中，因此本规范侧重于该范围。超出此范围需要进行自定义测试。 本文件中描述的程序已针对表2中所示的设计类型进行了评估。除表2中所示的设计外，使用USCAR-44可能会也可能不会产生与实际经验可接受的测试相关性，但USCAR尚未审查任何数据。USCAR-44可以用于开发、生产和现场分析的所有阶段，因为它是一种性能测试，而不是过程验证或质量评估。 除非已验证并记录符合本规范的所有适用要求，否则不得将任何护圈表示为符合USCAR/EWCAP规范。所有要求的验证和文件必须由零件供应商提供。如果测试是由另一个来源进行的，这并不能免除主要供应商对所有测试结果的文件记录（DVP&R）以及验证所有测试样本符合所有适用验收标准的责任。

This specification describes a method and acceptance criteria for testing automotive wire harness retainer clips. Retainer clips are plastic parts that hold a wire harness or electrical connector in a specific position. Typical plastic retainers work by having a set of "branches" that can be inserted into a hole sized to be easy to install but provide acceptable retention. This specification tests retainer clips for mechanical retention when exposed to the mechanical and environmental stresses typically found in automotive applications over a 15-year service life. This specification has several test options to allow the test to match to the expected service conditions. The variability of applications typically arises from different ambient temperatures near the clip, different proximity to automotive fluids, different exposure to standing water or water spray, and different thicknesses of the holes that the clip is inserted into. Clips are typically inserted into sheet or rolled metal from 0.6 to 8 mm thick, so this specification focuses on that range. Outside of this range requires a custom test. The procedures described in this document have been evaluated for the design types shown in Table 2. Use of USCAR-44 for other than a design shown in Table 2 may or may not produce acceptable test correlation to actual experience, but USCAR has not reviewed any data. USCAR-44 can be used at all phases of development, production, and field analysis since it is a performance test and not a process validation or quality assessment. No retainer may be represented as having met USCAR/EWCAP specifications unless conformance to all applicable requirements of this specification have been verified and documented. All required verification and documentation must be provided by the supplier of the part. If testing is performed by another source, it does not relieve the primary supplier of responsibility for documentation (DVP&R) of all test results and for verification that all samples tested met all applicable acceptance criteria.