Internal Threaded Steel Dowel Pins Custom Perfect M8 Plain Steel Parallel Dowel Pin 24mm Long

Descrição

What are Steel Dowel Pins?

Steel dowel pins are precision cylindrical fasteners used to align and secure mating components in machinery and assemblies. They provide exact positioning, shear strength, and load transfer between parts while preventing lateral movement. Unlike screws or bolts, dowel pins are press-fit or slip-fit into pre-drilled holes for permanent or semi-permanent alignment.

Materials of Steel Dowel Pins

1. Carbon Steel (SAE 1018/1045) – General-purpose, cost-effective.

2. Alloy Steel (AISI 4140/4340) – Heat-treated for high strength.

3. Stainless Steel (304/316/17-4PH) – Corrosion-resistant for harsh environments.

4. Case-Hardened Steel (Surface-hardened) – Wear-resistant for high-load applications.

5. Tool Steel (D2, O1) – Extreme hardness for precision tooling.

Surface Treatments

• Hardened & Ground – Precision finish for tight tolerances (±0.001″).

• Zinc Plating – Basic corrosion protection.

• Black Oxide – Anti-rust and reduced friction.

• Electroless Nickel – Uniform coating for wear resistance.

• Passivation (Stainless Steel) – Enhances corrosion resistance.

Specifications

• Types:

  • Straight Dowel Pins (Standard cylindrical).

  • Tapered Dowel Pins (For self-locking alignment).

  • Grooved Dowel Pins (Improved retention).

  • Diamond Knurled Pins (Press-fit for plastic/composite materials).

• Diameter Range: 1mm–50mm (metric) or 1/16″–2″ (imperial).

• Length: 5mm–300mm (custom lengths available).

• Tolerances: ISO h6/h7 (slip-fit) or m6/k6 (press-fit).

• Standards:

  • ISO 2338 (Straight pins).

  • DIN 7 (Precision dowels).

  • ANSI/ASME B18.8.2 (Imperial sizes).

Applications

• Automotive: Engine block alignment, transmission housings.

• Aerospace: Wing/fuselage assembly, landing gear components.

• Industrial Machinery: CNC machine tables, robotic arms.

• Medical Devices: Surgical instrument calibration.

• Electronics: PCB alignment in high-vibration environments.

Excellent Case: CNC Machine Tool Rebuild

Challenge: A manufacturing plant needed to restore accuracy to a worn CNC milling machine where the table had shifted 0.05mm due to years of vibration, causing part defects.

Solution:

• Used hardened alloy steel dowel pins (AISI 4340, 12mm dia, h6 tolerance).

• Reamed existing holes and press-fit new pins to realign the table.

• Applied black oxide coating to prevent fretting corrosion.

Result:

• Accuracy Restored to ±0.005mm – Eliminated scrapped parts.

• Machine Lifespan Extended 10+ Years – Avoided $250K replacement cost.

• 30-Minute Installation – Minimal downtime vs. full disassembly.