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1979年国际螺纹标准ISO965/I修订草案中对螺纹的牙底轮廓作了修改,对于高强度螺栓螺纹的牙底形状规定了更进一步的要求。 1.修订草案中有关牙底轮廓的内容 内外螺纹实际牙底轮廓上任何点不应超越基本牙型。 紧固件有8.8或更高的强度级(见ISO898/I)的外螺纹,其牙底应有圆滑的曲线(不折的),曲线部分的半径不应当小于0.125P,见表。
In 1979, the revised draft of International Standard for Threads (ISO / IEC6565 / I), the tooth bottom contours of the thread were modified to provide further requirements for the shape of the tooth bottom of high-strength bolt threads. 1. Revision of the draft content of the outline of the tooth inside and outside the thread at any point on the actual contour of the tooth should not exceed the basic type. Fasteners with an external thread strength of 8.8 or higher (see ISO 898 / I) shall have a smooth curve (not folded) on the bottom of the fastener, and the radius of the curved part shall not be less than 0.125P, see table.