Spring Pins
Spring Pins, also known as Roll Pins or Slotted Pins, are self-locking cylindrical fasteners designed to absorb shock, vibration, and impact loads while securely holding components in place. These pins feature a slotted or coiled design, allowing compression during insertion and expansion for a tight, interference fit. They are widely used in automotive, machinery, aerospace, and heavy equipment applications.
At Rajal Industries, we manufacture precision-engineered Spring Pins conforming to ASME, ISO, and DIN standards, ensuring high-retention force, fatigue resistance, and long-lasting durability in dynamic industrial environments.
Sizes & Standards
| Size Range | Standards |
|---|---|
| Imperial Diameters: 1/8" to 1/2" | ASME B18.27 – U.S. standard for slotted and coiled spring pins |
| Metric Diameters: Custom M2 to M12 | ISO 8753 – Standard for metric spring pins |
| Lengths: 1/2" to 4" | ISO 8752 – Standard for heavy-duty coiled pins |
| DIN 1481 – German standard for slotted tension pins |
Material & Strength Grades
| Material Type | Available Strength Grades | Industry Standards |
|---|---|---|
| Carbon Steel & Hardened Steel | Class 5.8, 8.8, 10.9 | ISO 8752, DIN 1481, ASME B18.27 |
| Stainless Steel (Corrosion Resistant) | A2-70 (SS 304), A4-80 (SS 316) | ISO 3506, ISO 8753 |
| Alloy Steel (High Fatigue Strength) | Class 10.9, 12.9 | ISO 8752, DIN 1481 |
| Phosphor Bronze & Brass (Non-Corrosive & Electrical Applications) | Custom Hardness Ratings | ISO 8752, ASME B18.27 |
- Heat-Treated for Maximum Hardness & Wear Resistance –Spring pins undergo hardening and tempering for improved fatigue life and mechanical durability.
- Load Ratings Based on Material & Application:
- Carbon Steel Class 8.8 Spring Pin: 800-900 MPa tensile strength
- Stainless Steel A4-80 Spring Pin: 700-800 MPa corrosion-resistant strength
Spring Pin Design & Engineering Features
Slotted & Coiled Design for Secure & Flexible Fastening
- The spring tension locks the pin into place, preventing loosening under vibration.
Expands inside the hole to ensure high-retention force and shock absorption.
High Shear Strength for Load-Bearing Applications
- Provides secure, non-threaded fastening with superior load distribution.
Used for gear assemblies, shafts, levers, and industrial joints.
Fatigue & Impact Resistance for Dynamic Environments
- Ideal for high-vibration applications in automotive, aerospace, and heavy machinery.
Ensures shock-absorption without loosening or material fatigue.
Corrosion-Resistant Variants for Harsh Environments
- Available in stainless steel, phosphor bronze, and black oxide finishes.
Ensures long-term durability in marine, aerospace, and high-humidity conditions.
Available in Slotted, Coiled & Heavy-Duty Variants for Specific Applications
- Slotted Spring Pins – Ideal for general-purpose fastening with moderate load capacity.
Coiled Spring Pins – Designed for high dynamic loads and long service life.
Heavy-Duty Spring Pins – Used in high-shear and extreme load conditions.
Thread Specifications & Precision Engineering
| Feature | Description | Application |
|---|---|---|
| Slotted Spring Pins | Provides spring tension for secure grip | General fastening, automotive components |
| Coiled Spring Pins | Designed for shock absorption and high dynamic loads | Aerospace, railways, heavy machinery |
| Heavy-Duty Spring Pins | Ensures high-shear strength & stability | Industrial enclosures, defense equipment |
| Phosphor Bronze Spring Pins | Offers non-corrosive and electrical insulation properties | Electronics, marine applications |
Thread Fitment & Compliance
- Metric spring pins conform to ISO 8753, ISO 8752 & DIN 1481 tolerances, ensuring secure component alignment.
- Imperial spring pins meet ASME B18.27 standards for precision engineering applications.
Common Applications of Spring Pins
- Automotive & Heavy Vehicles – Used for gearboxes, axle connections, and shock-resistant fastening.
- Industrial Machinery & Heavy Equipment – Ensures reliable fastening in rotating components and mechanical linkages.
- Aerospace & Defense Engineering – Provides secure vibration-resistant fastening in aircraft, satellites, and military vehicles.
- Railway & Marine Systems – Used in locomotive components, ship engine linkages, and offshore drilling platforms.
- Medical & Electronics Equipment – Ensures secure locking in medical devices, circuit boards, and instrumentation panels.
Why Choose Rajal Industries for Spring 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 slotted, coiled, and heavy-duty spring 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