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| ①,推荐用于强度要求不高的,诸如护栏、铰链等紧固连接上。不推荐用于较高要求的高强度紧固连接场合,那里一般应采用内凹槽圆柱头螺钉。 ②,公称长度小于等于表中标准长度数值的螺钉为全螺纹产品。这个完整螺纹(由一个无螺纹内倒角或无沉孔的通端螺纹环规测量)应延伸到头部支承面的两个螺距以内。更长的螺钉,其完整螺纹长度由制造者选择,最小长度为2倍螺钉公称直径加0.5英寸,最大长度也可以按全螺纹加工。螺钉的无螺纹部分应为公称直径,其公差应与内六角圆柱头中的光杆尺寸相同。 ③,螺纹为统一螺纹:UNRC 粗牙或UNRF 细牙系列,3A级。检查验收应符合ASME B1.3,体系22的要求。3A级精度没有为镀层提供间隙。 |
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