Guide to Punch Types and Applications

In precision stamping and tooling, selecting the right punch type is critical for tool life, performance, and part quality. Punches can be categorized by structure, function, and surface treatment. Below is a structured overview:

1. Basic Punches

Regular Punches
The most common type, used for general sheet metal punching. Suitable for standard materials, cost-effective, and available in a wide range of metric, inch, and coated variations.

Straight Punches for Heavy Load
Designed for thick or high-hardness materials. Built with higher strength and impact resistance, ideal for heavy-duty applications.

2. Shoulder Punches (Positioning & Load-Bearing)

Shoulder Punches
Feature a shoulder that limits installation depth, commonly used in precision dies.

Short Shoulder Punches
Used in applications where mold space is limited.

Double Stepped Shoulder Punches
Provide extra stability with a dual-shoulder design, suitable for precise positioning and special die requirements.

Quill Shoulder Punches
Designed for applications requiring enhanced support or specialized cooling/lubrication.

Mini Quill Punches
Ideal for micro-holes in electronics and fine terminal stamping.

Round Stopper Punches
Often include a stop function to prevent over-travel of the punch.

3. Ejector / Push-Out Punches (For Deep Holes & Anti-Clogging)

Ejector Punches
Equipped with an internal ejector to prevent material sticking, making them ideal for deep-hole and clog-prone punching.

• Extended Range Ejector Punches – For deep cavities and thick plates.
• Large Diameter Ejector Punches – For punching larger holes.
• Spring Reinforced Ejector Punches – Designed with spring support for higher impact resistance.

Key Flat Shank Ejector Punches
Provide anti-rotation and fixed positioning in the die set.

4. Special Design Punches

Key Flat Shank Shoulder Punches
Combine a shoulder design with a key-flat shank, ensuring precise orientation and positioning.

Key Flat Shank Tapped Punches
Feature threaded holes, suitable for modular dies or special fastening methods.

Close Space Punches
Specially developed for dense hole patterns such as motor laminations and electrical terminals.

Extended Range Punches
Used in deep punching positions or large die spaces.

5. Surface Treatments & Coatings (Applicable to All Punch Types)

Punches can be enhanced with advanced coatings and treatments, extending life and optimizing performance:

• TiCN, DLC – For high-speed punching, reducing wear and galling.
• CRN, DLC – For corrosion resistance.
• HW, RX, HX – For heavy-duty and wear-resistant applications.
• Lapping, WPC Treatment – For precision surface finish and improved durability.

Conclusion

Each punch type is engineered for specific tooling needs, from general punching to high-precision, heavy-load, or dense pattern applications. Coatings further extend tool life and improve performance in demanding production environments.

For more details on selecting the right punch for your application, feel free to contact us — we are a professional manufacturer of precision punches and die components.