Custom Flange Alignment Pins Two Hole Pins Set 6061 Aluminum Flange Pin

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What are Flange Alignment Pins?

Flange Alignment Pins are precision-engineered dowel pins used to ensure accurate alignment and positioning of two mating flanges or components during assembly. They help eliminate misalignment, reduce stress concentrations, and improve the overall structural integrity of the connected parts.

Key Features of Flange Alignment Pins

1. Materials

• Stainless Steel (AISI 304, 316) – Corrosion-resistant, ideal for harsh environments.

• Alloy Steel (AISI 4140, 4340) – High strength, suitable for heavy-duty applications.

• Carbon Steel (AISI 1018, 1045) – Cost-effective with good mechanical properties.

• Aluminum (6061-T6, 7075-T6) – Lightweight, corrosion-resistant, and ideal for applications where weight reduction is critical (e.g., aerospace, automotive).

• Titanium – Lightweight and highly corrosion-resistant for aerospace applications.

2. Surface Treatments

• Hardened & Ground – Improves wear resistance.

• Zinc Plating – Enhances corrosion resistance.

• Black Oxide – Provides mild corrosion protection and reduces friction.

• Passivation (for Stainless Steel) – Removes free iron and improves corrosion resistance.

3. Common Specifications

• Diameter: 3mm to 50mm (standard range)

• Length: 10mm to 300mm (custom lengths available)

• Tolerances: h7 (precision fit)

• Head Types: Straight, tapered, or threaded for easy installation

4. Applications

• Oil & Gas Pipelines – Ensures leak-proof flange connections.

• Aerospace & Defense – Aligns critical structural components.

• Heavy Machinery – Maintains precise alignment in gearboxes and engines.

• Automotive Manufacturing – Used in engine block and transmission assembly.

• Power Plants – Aligns turbine flanges for optimal performance.

Excellent Case: Flange Alignment Pins in Offshore Oil Rig Pipeline Assembly

Challenge:
An offshore drilling company faced frequent leaks in high-pressure pipeline flanges due to misalignment during assembly, leading to costly downtime and safety risks.

Solution:
Precision-machined stainless steel (AISI 316) flange alignment pins with zinc-nickel plating were used to ensure perfect alignment before bolting.

Results:

• Zero leaks after installation, improving safety and efficiency.

• Reduced assembly time by 30%, as workers no longer needed repeated adjustments.

• Extended service life due to minimized stress on flange gaskets and bolts.