Specification: Item Type: Straight Flute Tap Material: High speed steel System: Metric Thread Quantity: 4 Thread Tolerance Grade: 0.014 Through Hole/Blind Hole: Through Hole Tap Style: Straight groove Thread Code: Standard thread Usage: A set of products consists of 2 pieces, which can also be divided into head cone and two cones. For the screw thread with "blind hole", it can be "tapped to the bottom. Simply, it can be said that the head cone is rough machining and the second cone is fine machining. When tapping the thread, the screw tap shall not be screwed in too much each time the hinge screw is rotated. Generally, it is appropriate to screw in 1 / 2-1 turn each time, and the screw tap below M5 shall not be screwed in more than 1 / 2 turn at one time; when tapping fine thread or thread with high accuracy requirements, the feed rate each time shall be appropriately reduced; the speed of tapping cast iron can be appropriately faster than that of tapping steel. After each screw in, it is about to turn backward 1 / 2 of the stroke; when tapping deeper threads, the rotation stroke is larger and needs to be screwed back and forth for several times, which can break the chips, facilitate chip removal, reduce chip sticking on the cutting edge, so as to maintain a incisive edge; at the same time, the cutting fluid can smoothly enter the cutting part and play a role of cold but lubrication. When rotating the hinge bar, the force of the operator's two hands shall be balanced, and excessive force and left-right shaking shall be avoided, otherwise it is easy to tear the thread profile and cause the expansion and taper of the thread hole. Package List: 2 x Straight Flute Tap 1 x Storage Box