BS ISO 3294:2016规定了60°、90°直柄埋头孔的尺寸 和120°包括在内。它仅以公制单位指定尺寸，这些被视为唯一推荐的尺寸 将来，对于切割直径在8 mm到25 mm范围内的埋头钻。这些尺寸仅适用于由高速钢制成的工具。然而，如果生产方法 如果允许，柄可以由合适的替代材料制造，例如碳钢。除非另有说明，否则埋头孔将采用右手切割。莫氏锥柄埋头孔是ISO 3293的主题。交叉引用:ISO 3293ISO 13399购买本文件时可获得的所有现行修订均包含在购买本文件中。

BS ISO 3294:2016 specifies the dimensions of parallel shank countersinks for angles 60°, 90° and 120° inclusive.It specifies dimensions in metric units only, these being regarded as the only recommended dimensions in the future, for countersinks with cutting diameters in the range 8 mm to 25 mm.The dimensions apply only to tools made from high-speed steel. However, if the method of production allows, the shanks may be manufactured from a suitable alternative material, such as a carbon steel.Unless otherwise indicated, the countersinks will be right-hand cutting.Morse taper shank countersinks are the subject of ISO 3293.Cross References:ISO 3293ISO 13399All current amendments available at time of purchase are included with the purchase of this document.