考虑连杆螺钉的作用；

Pre-tight force of connecting rod screw;

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连杆螺钉在加工完成后成品交验前，要求进行预拉伸试验。

Before completing linkage screw in the machining, finished products are needed to do the pre-tensile test.

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该实用新型设计，实现了连杆螺钉的拉伸及伸长量的精确控制，有较好的生产实用价值。

The new design has realized stretching and precise control of elongation, which have better value in production and use value.

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