Coiled Pins
Coiled Pins, also known as Spiral Pins or Coiled Spring Pins, are resilient mechanical fasteners designed to absorb shock, reduce vibration, and distribute loads effectively. Unlike slotted spring pins, coiled pins offer superior flexibility and fatigue resistance, making them ideal for high-dynamic load applications in automotive, aerospace, precision machinery, and heavy equipment industries.
At Rajal Industries, we manufacture precision-engineered Coiled Pins conforming to ISO and general industry standards, ensuring high-retention force, long-lasting durability, and superior impact resistance in critical industrial applications.
Sizes & Standards
| Size Range | Standards |
|---|---|
| Metric Diameters: 0.5mm to 5mm | ISO 8748 – International standard for coiled spring pins |
| Imperial Diameters: Custom sizes available | General pin standards – Industry standard for coiled spring pins |
| Lengths: Customizable | No specific standard – Manufactured per application requirements |
Material & Strength Grades
| Material Type | Available Strength Grades | Industry Standards |
|---|---|---|
| Carbon Steel & Hardened Steel | Class 5.8, 8.8, 10.9 | ISO 8748, General Pin Standards |
| Stainless Steel (Corrosion Resistant) | A2-70 (SS 304), A4-80 (SS 316) | ISO 3506, ISO 8748 |
| Alloy Steel (High Fatigue Strength) | Class 10.9, 12.9 | ISO 8748, General Standards |
| Phosphor Bronze & Brass (Non-Corrosive & Electrical Applications) | Custom Hardness Ratings | ISO 8748, General Standards |
- Heat-Treated for Maximum Hardness & Fatigue Resistance –Coiled pins undergo hardening and tempering to enhance impact absorption and durability.
- Load Ratings Based on Material & Application:
- Carbon Steel Class 8.8 Coiled Pin: 800-900 MPa tensile strength
- Stainless Steel A4-80 Coiled Pin: 700-800 MPa corrosion-resistant strength
Coiled Pin Design & Engineering Features
Spiral Wound Design for High Flexibility & Fatigue Resistance
- The coiled structure allows gradual deformation, reducing stress concentration.
Expands inside the hole to ensure maximum retention force and shock absorption.
Ideal for High-Vibration & Dynamic Load Applications
- Maintains secure fastening in constantly moving parts.
Absorbs impact shocks without loosening.
Enhanced Load Distribution for Improved Performance
- Provides better stress absorption than slotted spring pins.
Reduces wear and tear on mating components.
Corrosion-Resistant Variants for Harsh Environments
- Available in stainless steel, phosphor bronze, and black oxide finishes.
Ensures long-term durability in marine, aerospace, and industrial applications.
Multiple Variants for Different Industrial Uses
- Light-Duty Coiled Pins – Ideal for low-load, high-fatigue applications.
Standard Coiled Pins – Used for universal fastening in automotive and industrial assemblies.
Heavy-Duty Coiled Pins – Designed for high-shear, high-impact environments.
Thread Specifications & Precision Engineering
| Feature | Description | Application |
|---|---|---|
| Light-Duty Coiled Pins | Provides flexibility for delicate assemblies | Electrical, precision instruments |
| Standard Coiled Pins | Designed for shock absorption and high-dynamic loads | Aerospace, railways, heavy machinery |
| Heavy-Duty Coiled Pins | Ensures high-shear strength & stability | Automotive, industrial tooling |
| Phosphor Bronze Coiled Pins | Offers non-corrosive and electrical insulation properties | Marine, electronics |
Thread Fitment & Compliance
- Metric coiled pins conform to ISO 8748 tolerances, ensuring secure component alignment.
- Imperial coiled pins are manufactured per general pin standards for universal compatibility.
Common Applications of Coiled Pins
- Automotive & Heavy Vehicles – Used for gear assemblies, axle connections, and impact-resistant fastening.
- Industrial Machinery & Heavy Equipment – Ensures secure locking in rotating components and mechanical linkages.
- Aerospace & Defense Engineering – Provides vibration-resistant fastening in aircraft components, satellites, and military vehicles.
- Railway & Marine Systems – Used in locomotive linkages, ship engine components, and offshore structures.
- Medical & Electronics Equipment – Ensures secure locking in medical devices, PCB enclosures, and instrumentation panels.
Why Choose Rajal Industries for Coiled Pins?
Manufactured to International Standards
Ensuring precision engineering, strength, and compliance.
High-Fatigue & Shock-Absorbing Design
Engineered for dynamic loads and long-term performance.
Customizable Variants Available
Offering light-duty, standard, and heavy-duty coiled pins.
Bulk & Custom Orders
Ideal for automotive, aerospace, precision tooling, and heavy machinery industries.
Stringent Quality Control
Each batch undergoes fatigue testing, dimensional accuracy verification, and corrosion resistance assessment.
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Our Offices
C-204, Vaibhav Platina, Nr. Kaveri Trishra, S P Ring road, Shilaj, Ahmedabad, Gujarat-380054
Call us
+91-846 036 2030
Email Us
rajalfast@gmail.com sales@rajalindustries.com