Anodized Aluminum Dowel Pins Cnc Custom Pin Connectors for Machine

Beschrijving

What are Aluminum Dowel Pins?

Aluminum dowel pins are precision cylindrical fasteners used to align and secure components in machinery, fixtures, and assemblies.  Aluminum dowel pins provide accurate positioning, reduce misalignment, and ensure repeatability in mechanical systems.

Material

• Aluminum Alloys: Typically made from 6061-T6 or 7075-T6 for a balance of strength, lightweight properties, and corrosion resistance.

Surface Treatments

• Anodizing (Hardcoat or Clear) – Improves wear resistance and corrosion protection.

• Passivation – Enhances oxidation resistance.

• PTFE Coating – Reduces friction for easier insertion/removal.

Specifications 

• Diameter: 1mm to 25mm (common sizes: 3mm, 5mm, 6mm, 8mm, 10mm)

• Length: 5mm to 100mm (custom lengths available)

• Tolerance: ±0.01mm (precision-ground for tight fits)

• Standards: DIN 6325, ISO 2338, ASME B18.8.2

Applications of Aluminium Dowel Pins

• Aerospace – Lightweight alignment in aircraft components.

• Automotive – Engine and transmission assembly positioning.

• Electronics – PCB fixturing and enclosure alignment.

• Robotics – Joint and actuator alignment.

• Medical Devices – Precision instrument assembly.

Excellent Case: High-Speed Robotics Arm Assembly

Challenge

A robotics manufacturer developing a high-speed pick-and-place arm needed a lightweight yet durable alignment solution for its joint mechanisms. The existing steel dowel pins added unnecessary weight, reducing operational speed and increasing motor strain. Additionally, frequent disassembly for maintenance caused wear on the dowel holes.

Solution

The company switched to hardcoat-anodized 6061-T6 aluminum dowel pins with the following specifications:

• Diameter: 6mm (±0.005mm tolerance)

• Length: 20mm (flush-fit design)

• Surface Treatment: Type III hard anodizing (50µm thickness) for wear resistance

Results

✔ 15% increase in arm speed due to reduced inertia from lightweight aluminum pins.
✔ Extended service life – Hard anodizing prevented galling during repeated insertions.
✔ Lower maintenance costs – No rust or seizing, unlike steel dowels in humid environments.
✔ Improved precision – Tight tolerances ensured consistent joint alignment, reducing calibration downtime.

Why Aluminum Dowel Pins Were Ideal

• Weight savings critical for high-speed automation.

• Corrosion resistance from anodizing suited cleanroom and industrial environments.

• Cost-effective compared to titanium while maintaining sufficient strength.