Hard Metal Punch Pin High Precision Tungsten Steel Punching Pin

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What is a Punch Pin?

A Punch Pin (also called a Drift Pin or Alignment Punch) is a hardened, cylindrical tool used for aligning holes, removing damaged fasteners, or driving pins and rivets during assembly or disassembly. Unlike standard dowel pins, punch pins are designed to withstand impact, making them essential in metalworking, automotive repair, and heavy machinery maintenance.

Key Features of Punch Pins

1. Materials

• Tool Steel (AISI D2, S7, H13) – High hardness and impact resistance for heavy-duty use.

• Carbon Steel (AISI 1045, 1095) – Cost-effective for general-purpose punching.

• Stainless Steel (AISI 420, 440C) – Corrosion-resistant for food, marine, or medical applications.

• Tungsten Carbide – Extreme wear resistance for high-precision or repetitive punching.

2. Surface Treatments

• Hardened & Tempered (HRC 50-60) – Enhances durability and impact resistance.

• Black Oxide Coating – Reduces friction and prevents rust.

• Chrome Plating – Improves corrosion resistance and surface hardness.

• Nitriding – Increases wear resistance without adding thickness.

3. Common Specifications

• Diameter: 1mm – 50mm (standard range)

• Length: 20mm – 300mm (custom lengths available)

• Taper Types: Straight, conical, or stepped for different applications

• Head Styles: Flat, rounded, or knurled for better grip

4. Applications

• Metal Fabrication: Aligning holes before bolting or riveting.

• Automotive Repair: Removing stuck bolts, bearings, or bushings.

• Aerospace Assembly: Precision alignment of structural components.

• Machinery Maintenance: Disassembling gears, shafts, and couplings.

• Construction & Shipbuilding: Heavy-duty alignment in steel structures.

Excellent Case: Punch Pins in Automotive Transmission Repair

Challenge:
A mechanic needed to replace a seized bearing inside a truck’s transmission but could not remove it without damaging the housing.

Solution:
A hardened tool steel (S7) punch pin with a tapered tip was used to apply controlled force and gradually drive out the bearing without distorting the transmission casing.

Results:

• Successful bearing removal without damaging the housing, saving costly replacement parts.

• Reduced downtime – The repair was completed in 30 minutes instead of hours.

• Extended tool life – The punch pin showed no signs of deformation even after repeated use.