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这种丝锥的结构特点(如图所示):切削锥部较长,斜角较小,一般取3°_°~+30′。后部留有2.5t～3t长的具有成形尺寸和完整螺纹截形的螺纹(t为螺纹的螺距)。为了保证丝锥切削过程能顺利进行和具有一定的耐用度,应在沿切削锥部和完整扣螺纹部分,每牙均须铲磨后角,并分别留有f_1和f的圆柱形螺纹刃带。f_1值取0.2～0.5mm,而f值可取0.5～3mm。在攻螺纹时为了能达到被加工螺纹的表面粗糙度,在f_1和f交界处不允许有尖角。而且丝锥后部的螺纹不完全的扣应去除。
The structural characteristics of this tap (as shown): cutting cone longer, smaller bevel, usually take 3 ° _ ° ~ +30 ’. The rear left 2.5t ~ 3t length of the thread with a full size and complete thread truncation (t thread pitch). In order to ensure that the tap cutting process can be carried out smoothly and with a certain degree of durability, a clearance angle of each tooth should be scraped along the cutting cone and the complete thread, leaving f_1 and f cylindrical thread land respectively. f_1 value of 0.2 ~ 0.5mm, f value of 0.5 ~ 3mm desirable. In tapping thread in order to be able to achieve the surface roughness of the thread being processed, f_1 and f at the junction does not allow sharp corners. And taps the thread incomplete buckle should be removed.