Stamping Punch Pins – SKH51

Precision Die Punch with TiN / TiCN / DLC Coating

Product Overview

Our stamping punch mould die punch pins are manufactured from high-performance tool steel, such as SKH51 (M2 equivalent), and are designed for precision metal stamping applications.

These punch pins are widely used in:

• Progressive dies

• High-speed stamping molds

• Connector and terminal production

• Automotive metal components

• Electronic lead frames

Engineered for dimensional stability and wear resistance, they are suitable for high-cycle industrial stamping environments.

Material Selection – SKH51 Tool Steel

SKH51 is a high-speed tool steel known for:

• High hardness after heat treatment

• Good impact toughness

• Stable cutting-edge geometry

• Resistance to wear under cyclic load

Typical hardness range:
60–62 HRC (customizable depending on material being stamped)

Alternative materials available:

• Carbide

• ASP23

• M2

• D2 / SKD11

Material selection depends on stamping thickness and workpiece type.

Engineering Focus

Punch pins operate under compressive load and shear stress.
Performance depends on precision geometry, surface finish, and coating compatibility.

1) Dimensional Precision

Critical tolerance control:

• Size tolerance: ±0.001 mm

• Axiality: ≤ 0.002 mm

• Roundness: ≤ 0.0015 mm

• Surface finish: Ra 0.8 (Ra 0.4 achievable)

Precise concentricity reduces uneven wear and improves guide bush alignment.

2) Edge Stability & Wear Resistance

Cutting-edge geometry is carefully ground and inspected.

• Controlled grinding process

• Stable heat treatment

• Reduced micro-chipping risk

• Replaceable punch design

Proper edge integrity extends service life and reduces downtime.

Surface Coating Options (PVD)

Surface engineering significantly improves punch performance depending on the stamping material.

TiN Coating

• Microhardness: approx. 2300 HV

• Good general wear resistance

• Cost-effective solution

• Suitable for mild steel and carbon steel

Not recommended for stainless steel or nickel alloys.

TiCN Coating

• Microhardness: approx. 3000 HV

• Lower friction coefficient

• Better wear resistance than TiN

• Suitable for stainless steel, nickel, and copper

Recommended for demanding metal stamping.

TiAlN Coating

• Microhardness: approx. 3400 HV

• High thermal stability

• Suitable for high-speed or high-heat applications

DLC Coating

• Extremely low friction coefficient

• Suitable for thin sheet stamping

• Reduces adhesive wear

• Effective for stainless steel and non-ferrous materials

Coating selection depends on the stamped material and the lubrication condition.

Standards & Compatibility

Punch pins can be manufactured according to:

• MISUMI

• HASCO

• DME

• DAYTON

Custom diameters, lengths, and special profiles are supported.

Manufacturing Capability

Processing equipment includes:

• CNC machining centers

• CNC lathes

• Sodick EDM & wire EDM

• Cylindrical grinding (OD / ID)

• Surface grinding

Precision grinding ensures geometric stability and a smooth surface finish.

Quality Control

Inspection equipment includes:

• Coordinate Measuring Machine (CMM)

• Roughness tester

• Hardness tester

• Digital height gauges

• Projection measurement systems

Each batch undergoes full-dimensional inspection before shipment.

Typical Applications

• Automotive connector terminals

• Lead frame stamping

• Battery components

• Stainless steel precision stamping

• Copper and brass sheet processing

Punch material and coating are selected according to stamping conditions.

Packaging & Delivery

• Anti-corrosion oil protection

• Bubble wrap & carton packaging

• QA inspection report included

• Shipping via DHL / FedEx / UPS / Sea freight

Technical FAQ

Q1: Why choose SKH51 over carbide?
SKH51 provides better toughness and lower brittleness risk in shock-load applications.

Q2: Which coating is best for stainless steel?
TiCN or DLC coatings are generally recommended.

Q3: Can you manufacture ultra-small punch pins?
Yes. Micro-diameter punches can be produced with strict tolerance control.

Q4: How is coating adhesion ensured?
Through surface preparation and a controlled PVD process to prevent flaking.

Q5: Are replacement punches available?
Yes. Interchangeable punch designs are supported for maintenance efficiency.

Request a Technical Quote

Please provide:

• 2D / 3D drawing

• Stamping material type

• Sheet thickness

• Production speed

• Coating preference

Our engineering team will review your stamping conditions and recommend material and coating solutions.