CoCud Round Threading Dies, 1/4-20 UNC Thread, 9SiCr Alloy Tool Steel, Thread Milling Tool for Sewing Machine Screw Repair, 2 Pieces

Attributes:

*Thread Size: 1/4-20 UNC (Right-Hand) *Diameter: 20mm *Thickness: 7mm *Material: 9SiCr Alloy Tool Steel *Accuracy: 6g

Includes:

*2 x Round Thread Dies

Application Features:

--- Suitable for machining, repairing, or cleaning male threads in stainless steel, aluminum alloys, cast iron, copper, iron, aluminum, and plastic. Ideal for rethreading existing threads in hard materials such as metals or creating new threads in soft materials such as plastics. Widely used for repairing machine threads. When tapping, apply appropriate lubricant to the cutting edge. This facilitates cutting and cooling, resulting in lighter and faster cuts and improved finish and dimensional accuracy. Repeat the tapping process 3-4 times until the desired length of thread is formed. --- Commonly used 9SiCr alloy tool steel has high hardness, high torque, good toughness, high hardenability, and high tempering stability. The rounded design, clear thread, and wear resistance allow for easy thread repair. The surface is coated with grease for lubrication and rust prevention. The thread cutting die cuts the thread clockwise and reverses every 1/4-1/2 turn to remove chips from the chip hole. The die's locating groove must be aligned with the locking screw in the center of the die wrench. Insert the screw into the groove and tighten. Be sure to apply uniform pressure.

Helpful Tips:

--- The diameter of the bar should be approximately 0.05-0.15 mm smaller than the nominal diameter of the required thread. The slightly smaller diameter facilitates tapping and maintains proper thread height. The end of the bar should have a 1*45-degree chamfer. Do not use on tile, concrete, walls, stone, etc. ★ Round Thread Die Size --- Thread Size: 1/4-20 UNC (Right-Hand); Diameter: 20 mm; Thickness: 7 mm; Accuracy: 6 g ★ Wide Range of Applications --- Process, repair, or clean male threads in stainless steel, aluminum alloys, copper, iron, aluminum, and plastics. Ideal for rethreading existing threads in hard materials like metals or creating new threads in soft materials like plastics. ★ Easy to Use --- Reverses every 1/4 to 1/2 turn to eject chips through the chip hole. The die's locating groove must align with the set screw in the center of the die wrench. Insert the screw into the groove and tighten. ★ 9SiCr Alloy Tool Steel --- Commonly used 9SiCr alloy tool steel has high hardness, high torque, good toughness, high hardenability, and excellent tempering stability. ★ Useful Tips --- When tapping, apply appropriate lubricant to the cutting edge. Repeat the tapping process 3-4 times until the desired thread length is achieved. Rounded design, clear thread, wear-resistant, easy thread repair.