기능

• Sewing machine screws.
• Suitable for tapping machine.
• It is used for a stop hole and the chips curl upward.
• The IS spiral tap has a unique design for the twist angle, groove shape, cut and run angle (chamfer), etc. The cutting torque is especially light (about 1/2 of the hand tap), and the screws are treated homogeneously to enhance the abrasion resistance, so the durability is excellent.