The electroless nickel thickness shall be 3 to 6 urn [118.1 to 236.2 pin] at ± 4 sigma (standard deviations) from the mean as measured on a nominal pad size of 1.5 mm x 1.5 mm [0.060 in x 0.060 in] or equivalent area, where standard feature size tolerances as expressed in the IPC-6010 standard series, apply. The upper end of this thickness specification has been chosen based on concerns with insertion force issues for compliant pin applications only. Use of thicknesses outside of this range shall be AABUS.
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机译：在1.5 mm x 1.5 mm [0.060 in x 0.060 in]或等效面积的标称焊盘尺寸上测得的平均值的±4 sigma（标准偏差）下，化学镀镍厚度应为3至6 urn [118.1至236.2针] ，适用IPC-6010标准系列中表示的标准特征尺寸公差。选择此厚度规格的上端是基于对插入力问题的关注，仅适用于顺应针应用。超出此范围使用的厚度应为AABUS。
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