Spiral fluted tap

The utility model discloses a spiral fluted tap, which relates to the technical field of taps and comprises a tap body. The tapping part is connected to one end of the screw tap body; the handle part is connected to the other end of the screw tap body; the first spiral groove is formed in the tapping part; the second spiral groove is formed in the tool nose of the back tool face of the tapping part; wherein the first spiral groove is communicated with the second spiral groove, and the size of the first spiral groove is larger than that of the second spiral groove. The utility model has the technical effects that not only can the scrap be prevented from extruding the back cutter surface, but also the scrap with smaller size can be accommodated. 本实用新型公开了一种螺旋槽丝锥，涉及丝锥技术领域，包括：丝锥本体；连接于丝锥本体的一端的攻丝部；连接于丝锥本体的另一端的柄部；设于攻丝部上的第一螺旋槽；设于攻丝部的背刀面的刀尖上的第二螺旋槽；其中，第一螺旋槽和第二螺旋槽连通，第一螺旋槽的尺寸大于第二螺旋槽的尺寸。本实用新型的技术效果在于它既能防止废屑对背刀面产生挤压，又能用于容纳尺寸较小的废屑。