在圆柱或圆锥螺栓两头表面上制出的螺旋线形的、具有特定截面的连续凸起旋纹，用于连接螺栓和螺母，即双头螺栓的螺纹。右图为双头螺栓表面上的螺纹。 国标对双头螺纹有相应规定，请查阅参考。
本实用新型公开了一种双头螺纹紧固装置。
The utility model discloses a double thread fastening device.
目的初步比较经颈前路单枚单头螺纹中空加压螺钉与双头螺纹中空加压螺钉内固定治疗齿突骨折的效果。
Objective To compare the clinical effectiveness of fixations of odontoid process fractures preliminarily with anterior single one-threaded and double-threaded canulated compressive screws.
三枚中空双头螺纹加压钉比三枚实心螺纹钉、三翼钉在抗压、抗弯、抗扭强度和刚度上占有一定的优势。
The 3 hollow double heads compression screw appear to offer distinct advantage over the 3 solid screw, trifin in the against pressure, against bending force, torsional strength and torsional rigidity.
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