Precision Die Punch Pins – M2 HSS with TiN Coating

High-Speed Steel Punch Tooling for Progressive Stamping Dies

Product Overview

Our precision die punch pins manufactured from M2 high-speed steel (HSS) are designed for high-cycle metal stamping applications.

These punch toolings are widely used in:

• Progressive stamping dies

• Connector and terminal production

• Automotive sheet metal components

• Medical precision metal parts

• Electronic lead frame stamping

With controlled heat treatment and optional TiN coating, these punches provide stable edge retention and extended service life in repetitive production environments.

All punch pins are manufactured strictly according to customer drawings.

Material – M2 High-Speed Steel

M2 (equivalent to SKH51) is commonly selected for stamping punch applications due to:

• High hardness after heat treatment

• Good impact resistance

• Stable cutting-edge geometry

• Reliable performance in medium to high-speed stamping

Typical hardness range:
60–62 HRC (customizable based on stamping material)

M2 provides a balanced combination of hardness and toughness suitable for carbon steel and general alloy stamping.

Surface Coating – TiN (Titanium Nitride)

Optional TiN PVD coating improves wear resistance and reduces friction.

Key characteristics:

• Microhardness approx. 2300 HV

• Reduced the friction coefficient

• Improved resistance to abrasive wear

• Suitable for carbon steel and mild steel stamping

For stainless steel or more demanding materials, TiCN or DLC may be recommended.

Engineering Focus

Punch performance depends on geometry accuracy, edge stability, and surface condition.

1) Precision Grinding & Tolerance Control

Critical control parameters:

• Dimensional tolerance: ±0.01 mm (tighter tolerance available upon request)

• Axiality: ≤ 0.005 mm

• Verticality: ≤ 0.005 mm

• Surface finish: Ra 0.6

Controlled cylindrical grinding ensures proper alignment with guide bushings and reduces uneven wear.

2) Heat Treatment & Hardness Stability

Process includes:

• Controlled heating cycle

• Oil quenching

• Tempering to relieve internal stress

• Straightness verification

Proper heat treatment ensures uniform hardness distribution and minimizes distortion.

3) Edge Geometry & Wear Behavior

Punch tip geometry is ground according to:

• Required clearance

• Stamping thickness

• Material hardness

Stable edge preparation reduces micro-chipping and improves service intervals.

Technical Specifications

• Product Type: Precision Die Punch Pin

• Material: M2 High-Speed Steel

• Hardness: 60–62 HRC

• Surface Finish: Ra 0.6

• Axiality: ≤ 0.005 mm

• Verticality: ≤ 0.005 mm

• Surface Treatment: TiN (optional), TiCN, DLC available

• Manufacturing: Made-to-order (Built-to-Print)

• Inspection: 100% QC before shipment

Custom diameters, lengths, and special shapes are supported.

Manufacturing Process Overview

1. Raw material inspection and cutting

2. Heat treatment and straightening

3. Precision cylindrical grinding

4. Surface polishing

5. Coating application (if specified)

6. Final dimensional inspection

Each step is controlled to ensure repeatability and interchangeability.

Typical Applications

• Progressive die stamping

• Connector terminal manufacturing

• Sheet metal forming

• Automotive bracket stamping

• Appliance component production

Material and coating selection should match workpiece type and production speed.

Quality Control

Inspection equipment includes:

• Coordinate Measuring Machine (CMM)

• Height gauges and micrometers

• Surface roughness tester

• Hardness tester

Each punch is verified for dimensional conformity before packaging.

Technical FAQ

Q1: Why choose M2 instead of carbide?
M2 provides better toughness and is more cost-effective for medium-load stamping applications.

Q2: When is TiN coating recommended?
TiN is suitable for carbon steel and mild steel stamping to improve wear resistance.

Q3: Can tighter tolerances be achieved?
Yes. Tighter tolerances can be specified for high-precision applications.

Q4: Is coating adhesion reliable?
Yes. Surface preparation ensures proper coating bonding during the PVD process.

Q5: Are special-shaped punches supported?
Yes. Custom profiles and non-standard geometries are available.

Request a Technical Quote

Please provide:

• 2D / 3D drawings

• Stamping material type

• Sheet thickness

• Production speed

• Coating requirements

Our engineering team will review your application and recommend suitable material and coating combinations.