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BS 4174 - 1972 Thread and point details for types D and T thread cutting screws (unified form threads) [TABLE 7]

螺纹
4# 4# 6# 6# 8# 8# 10# 10# 1/4 1/4 5/16 5/16
PP
最大值 大径
最小值
最大值 末端直径
最小值
40 48 32 40 32 36 24 32 20 28 18 24
0.1120 0.1120 0.1380 0.1380 0.1640 0.1640 0.1900 0.1900 0.2500 0.2500 0.3125 0.3125
0.1072 0.1076 0.1326 0.1332 0.1586 0.1590 0.1834 0.1846 0.2428 0.2438 0.3043 0.3059
0.086 0.090 0.106 0.112 0.132 0.135 0.147 0.158 0.198 0.213 0.255 0.269
0.077 0.083 0.095 0.103 0.121 0.125 0.133 0.147 0.181 0.201 0.236 0.255
①, 锥形末端长度 y:
对于螺纹长度等于或小于8个螺牙的螺钉,y=2-1/2至3-1/2螺牙长度。
对于螺纹长度大于8个螺牙的螺钉,y=3-1/2至4-1/2螺牙长度。
②, 以上尺寸适用于无涂层螺钉,涂层后可能会超过该尺寸。

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