M24 Hand Tap
The M24 hand tap is a tool used to create internal threads with a standard pitch of 3 millimeters in pre-drilled holes with an approximate diameter of 21 millimeters. This tap is typically made of high-carbon steel or high-speed steel HSS to ensure high resistance to wear and operational heat. The overall length usually ranges from 100 to 120 millimeters, with a thread-cutting length of about 30 millimeters. The spiral angle in M24 hand taps is generally zero, and the cutting type is straight flute, making it suitable for soft to medium alloys. The tap set may be produced in three stages—taper, plug, and bottom—allowing for stepwise chip removal.
Using an M24 hand tap is typically done with a tap wrench, and the applied torque must be appropriate for the material. In structural steel, the applied torque should not exceed 90 newton-meters. The thread standard for this tap is usually based on ISO 261, with a tolerance class between H6 and H8. The surface finish may be uncoated or coated with materials such as TiN or black oxide to extend tool life. It is commonly used in manufacturing industrial equipment, mechanical fittings, and repair work. Proper lubrication, especially in manual threading, is essential to prolong tool life and ensure high thread quality.
