自攻螺釘預(yù)孔的參考值

自攻螺釘預(yù)孔的參考值（參考件摘自SJ2495-84附錄A）本文推薦了不同尾端形狀自攻螺釘?shù)挠糜诓煌牧系念A(yù)孔參考值，以供選擇。因材料與加工方法的不同，預(yù)孔值也必須相應(yīng)改變。預(yù)孔直徑小于或等于2倍金屬板厚時，建議使用C型，F(xiàn)型螺釘，表中帶括號的數(shù)字只適用于F型螺釘。注：自攻螺釘按頭部形狀，分為C型（尖頭）、F型（平頭）、FT型（帶刃口）三種。預(yù)孔尺寸的偏差為H12。表A1對應(yīng)于C型、F型螺釘?shù)念A(yù)孔值 mm螺紋規(guī)格料預(yù) 孑L 直 徑鋼不銹鋼錳鐵合金黃銅鋁合金沖孔或模壓孔徑鉆孔或光滑沖孔沖孔或模壓孔徑鉆孔或光滑沖孔沖孔直徑鉆孔直徑?jīng)_孔直徑鉆孔直徑ST2.20.401.60.461.60.601.71.60.801.81.60.951.851.61.21.851.71.51.91.8ST2.90.42.22.2（0.46）2.22.20.6(2.5)2.30.8(2.5)2.42.20.95(2.5)2.42.21.22.52.21.52.62.31.92.652.3(2.7)(2.4)ST3.50.42.82.60.462.82.60.62.82.72.80.82.82.72.82.60.952.82.82.82.6(1.2)2.82.82.61.52.952.71.93.052.82.7(3.25)2.83.25-6.353.05螺紋規(guī)格料預(yù) 孑L 直 徑鋼不銹鋼錳鐵合金黃銅鋁合金沖孔或模壓孔徑鉆孔或光滑沖孔沖孔或模壓孔徑鉆孔或光滑沖孔沖孔直徑鉆孔直徑?jīng)_孔直徑鉆孔直徑ST4.20.463.50.603.53.23.50.83.53.23.53.00.953.53.23.53.11.23.53.33.53.31.53.53.52.03.63.62.7(3.8)(3.76)3.2(3.8)(3.76)3.4(3.9)(3.8)4.1-9.5(3.9)ST4.80.53.960.63.963.63.960.83.963.63.960.93.963.73.963.61.23.963.83.963.61.53.83.62.03.963.72.7(4.06)(3.7)3.2(4.3)(3.9)3.4(4.3)(3.9)4.2(4.4)(4.0)5-9.5(4.2)ST5.50.64.20.84.74.20.94.74.21.24.74.34.11.54.74.54.22.04.64.42.74.74.63.2(5.0)4.63.4(5.0)4.64.2(5.1)4.85-9.55.0ST6.30.85.24.90.95.24.91.25.24.91.55.05.02.05.15.062.7(5.2)5.13.2(5.7)5.23.4（5.7）5.34.2（5.9）5.34.7（5.9）5.55-9.5（5.9）5.7浸漬樹脂：膠合板層壓布板螺紋規(guī)格孑L 徑材料厚度盲孑L深度最 小最 小最 大ST2.21.93.24.813ST2.92.64.86.516ST3.53.14.86.516ST4.23.74.86.519ST4.84.26.4&025ST5.54.9&09.525ST6.35.7&09.525表A3對應(yīng)于C型、F型螺釘石棉制品的預(yù)孔值 mm螺紋規(guī)格孑L 徑材料厚度盲孑L深度最 小最 小最大ST2.21.93.24.813ST2.92.64.86.516ST3.53.14.86.516ST4.23.7&09.520ST4.84.2&09.520ST5.54.9&09.525ST6.35.7111325表A4對應(yīng)于F型螺釘?shù)念A(yù)孔值 mm鑄造材料：鋁、鎂、鋅、黃銅、青銅螺紋規(guī)格孔徑最小盲孔深度ST2.22.03.2ST2.92.64.8ST3.53.26.5ST4.23.96.5ST4.84.46.5ST5.55.07.0ST6.35.99.5螺紋規(guī)格酚醛樹脂醋酸纖維、硝酸纖維、丙烯酸樹脂孑L 徑最小盲孔深度孑L 徑最小盲孔深度ST2.22.04.82.04.8ST2.92.56.52.46.5ST3.53.26.53.06.5ST4.23.8&03.6&0ST4.84.4&03.8&0ST5.55.09.54.89.5ST6.35.99.55.69.5表A6對應(yīng)于FT型螺釘?shù)哪ｈT鋅和鋁預(yù)孔值 mm螺紋規(guī)格材料厚度孑L 徑螺紋規(guī)格材料厚度孑L 徑ST2.91.51.9ST4.33.24.22.11.93.64.22.81.954.84.23.21.956.44.33.61.95&04.35ST2.92.82.59.54.353.22.6ST5.53.24.93.62.63.64.94.82.64.84.96.42.656.45.0ST3.53.23.0&05.03.63.09.55.04.83.0ST6.33.25.66.43.23.65.6&03.24.85.6ST4.23.23.86.45.73.63.8&05.74.83.89.55.76.43.9&03.9表A7對應(yīng)于FT型螺釘?shù)乃芰现破奉A(yù)孔值 mm螺紋規(guī)格酚醛樹脂醋酸纖維、硝酸纖維、丙烯樹脂、苯已烯樹脂孑L徑盲孔深度孑L徑盲孔深度最小最大最小最大ST2.22.02.46.41.92.46.4ST2.92.73.2&02.63.2&0ST3.53.24.89.53.04.89.5ST4.23.76