Forming Taps vs. Cutting Taps

Although forming taps are used less frequently than cutting taps, they offer distinct advantages. When selected appropriately, forming taps can deliver high thread accuracy, enhanced strength, and smooth surface finishes, while also helping to reduce overall production costs.

1. Selection and Application

(1) Processed Materials

Forming taps are best suited for materials with good plasticity, such as copper, aluminum alloys, low-carbon steels, leaded steels, and austenitic stainless steels. When selecting a forming tap, it is important to first assess the machinability of the workpiece material. The tap's diameter and thread pitch will determine if it is suitable for extrusion processing.
Smaller diameters and finer threads allow for wider material compatibility. In contrast, large diameters and coarse pitches are only suitable for very soft materials.

(2) Tapping Speed

Tapping speed depends on the tap diameter, pitch, material hardness, and lubrication. For soft materials and fine threads, forming taps can run 1.5 to 2 times faster than cutting taps. For coarse threads or harder materials, the speed should be reduced due to higher torque requirements and potential thread distortion.

2. Features of Forming Taps

①High Durability and Efficiency

Compared with cutting taps, forming taps have higher strength and wear resistance. They feature longer tool life, lower breakage rates, and greater production efficiency.

②No Chip Generation

Forming taps shape threads through metal flow rather than cutting, resulting in stronger threads, smoother surfaces, and more consistent dimensions.

③Self-Guiding but Higher Torque

Forming taps are self-guided and compatible with general tapping machines. However, due to the nature of extrusion, the required torque is generally 1 to 1.5 times that of cutting taps.

In some production cases, cutting taps were initially used. However, after comparing thread quality, tap life, and production efficiency, forming taps were found to be the better choice.

Therefore, the decision between forming and cutting taps should be made based on actual material characteristics, product requirements, and equipment capability to achieve optimal results.