M4 M5 M6 DIN7343 Galvanized Coiled Spring Pin,DIN 7343 Spiral Pins,Coiled Spring Pins

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What is a Coiled Spring Pin?

A Coiled Spring Pin (also known as a Spiral Pin) is a self-retaining mechanical fastener made from a tightly wound steel strip, forming a hollow, cylindrical pin with a slight interference fit when installed. Its coiled design allows it to compress and expand, providing flexibility and vibration resistance in assemblies.

Materials

They are typically made from:

• Carbon Steel (Most common, cost-effective, and durable)

• Stainless Steel (Corrosion-resistant, ideal for harsh environments)

• Alloy Steel (High strength for heavy-duty applications)

Surface Treatments

To enhance performance, coiled spring pins may have:

• Galvanized & Zinc Plating (Basic corrosion resistance)

• Black Oxide (Improves wear resistance and appearance)

• Passivation (for Stainless Steel) (Enhances corrosion resistance)

• Phosphate Coating (Improves lubrication and wear resistance)

Specifications

• Diameter Range: 0.8 mm to 25 mm (varies by standard)

• Length Range: 3 mm to 200 mm (custom lengths available)

• Standards: DIN 1481, ISO 8752, ANSI B18.8.2

Applications

Coiled spring pins are widely used in:

• Automotive (Gearboxes, transmissions, suspension systems)

• Aerospace (Flight control linkages, engine components)

• Industrial Machinery (Pivot joints, hydraulic systems)

• Electronics (Housings, connectors, PCB mounts)

• Medical Devices (Surgical instruments, adjustable mechanisms)

Excellent Case: Automotive Transmission Assembly

Challenge: A leading automotive manufacturer needed a reliable fastener for synchronizer hubs in manual transmissions, requiring high shear strength and vibration resistance.

Solution: Coiled spring pins (carbon steel, zinc-plated) were used to secure the gear shift mechanism. Their flexibility accommodated minor misalignments, while the interference fit prevented loosening under vibration.

Result:

• Improved durability (No pin failures even after 200,000+ cycles)

• Reduced maintenance costs (No re-tightening needed)

• Enhanced assembly efficiency (Easy installation with standard tools)