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1、自攻螺丝底孔设计标准（以上数据供设计参考，请试验确认后使用）A螺丝基本尺寸标准标称尺寸牙数圆形直径 Dia.of Circle三角形直径 Dia.of Triangle辗造径DesignationPith最大Max最小Min最大Max最小MinMaterial DiaM2.0402.041.961.961.881.57M2.3322.342.262.262.181.81M2.6282.642.562.552.472.07M3.0243.052.952.952.852.37M3.5203.553.453.463.342.78M4.0184.053.953.913.813.14M5.0165.06
2、4.944.94.784B用于钢铁或较硬金属材料时底孔直径标准标称尺寸板厚（或攻入深度）Thickness of the materialDesignation0.60.811.21.622.63.2M2.01.551.61.61.61.651.651.7M2.31.91.91.91.951.951.9522M2.62.152.152.22.22.22.252.252.3M3.02.652.652.652.72.72.72.72.75M3.53.053.053.053.13.13.13.153.15M4.03.63.63.63.63.653.653.653.65M5.04.54.54.54.5
3、54.554.64.6C用于铝锌铜等较软金属材料及塑料材料时底孔直径标准标称尺寸板厚（或攻入深度）Thickness of the materialDesignation铝锌铜等较软金属材料电木等 硬质塑料ABSPP等 塑料1234.04.0 以下4.0 以上5.0 以下5.0 以上M2.01.551.61.65M2.31.851.91.952M2.62.152.22.252.32.22.25M3.02.62.652.652.72.552.652.52.6M3.533.053.053.12.953.052.93M4.03.553.553.63.63.43.453.353.45M5.04.454.454.54.5
