°、90°和 120°的直柄锪钻

[中文适用范围]： 本国际标准规定了平行沉头锪孔的角度为60°、90°和120°时的尺寸。它仅规定了公制单位的尺寸，这些被认为是未来唯一的推荐尺寸（除非另有说明，否则锪钻的切削直径在8 mm到25 mm范围内）。所述尺寸仅适用于高速钢制成的工具。然而，如果生产方法允许，杆部可能由合适的替代材料制造，例如碳钢。除非另有规定，否则锪钻为右旋切削。 平行沉头锪孔的范围包括角度60°、90°和120°，尺寸以公制单位表示 [外文原描述]： 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.