Cotter Pins
Cotter Pins, also known as split pins, are simple yet highly effective mechanical fasteners used to secure bolts, nuts, clevis pins, and other fasteners in place. These pins feature a split, bent-leg design that expands after insertion, preventing unintended loosening in high-vibration or high-load applications. They are widely used in automotive, railway, aerospace, marine, and heavy machinery industries.
At Rajal Industries, we manufacture precision-engineered Cotter Pins conforming to ASME, ISO, and DIN standards, ensuring high-strength retention, corrosion resistance, and long-lasting reliability in demanding industrial applications.
Sizes & Standards
| Size Range | Standards |
|---|---|
| Imperial Diameters: 1/16" to 3/8" | ASME B18.8.2 – Standard for split cotter pins |
| Metric Diameters: Custom M1.6 to M10 | ISO 8751 – Standard for spring-type split pins |
| Lengths: 1/2" to 6" | DIN 94 – German standard for split pins |
| ISO 1234 – Standard for metric cotter pins |
Material & Strength Grades
| Material Type | Available Strength Grades | Industry Standards |
|---|---|---|
| Carbon Steel & Mild Steel | Class 4.8, 5.8, 8.8 | DIN 94, ISO 8751, ASME B18.8.2 |
| Stainless Steel (Corrosion Resistant) | A2-70 (SS 304), A4-80 (SS 316) | ISO 3506 |
| Brass (Non-Corrosive & Electrical Applications) | Custom Hardness Ratings | ISO 1234, DIN 94 |
- Heat-Treated for Maximum Strength –Cotter pins undergo cold forming and heat treatment for enhanced wear resistance and mechanical durability.
- Load Ratings Based on Material & Application:
- Carbon Steel Class 8.8 Cotter Pin: 800-900 MPa tensile strength
- Stainless Steel A4-80 Cotter Pin: 700-800 MPa corrosion-resistant strength
Cotter Pin Design & Engineering Features
Split-Leg Design for Secure Locking & Easy Installation
- The bent legs expand after insertion, locking the pin securely into place.
Prevents nuts, bolts, and clevis pins from loosening due to vibration or movement.
Available in Various Head & End Styles for Different Applications
- Extended-Prong & Standard-Prong Cotter Pins – Ideal for universal fastening.
Tapered-End Cotter Pins – Allow easier insertion and removal.
Hammer-Lock Cotter Pins – Designed for high-strength, impact-resistant applications.
Reusable & Easy-to-Remove Design for Maintenance Applications
- Allows quick disassembly for machinery, vehicle axles, and equipment servicing.
Can be bent and straightened multiple times without breakage.
Corrosion & Temperature Resistance for Harsh Environments
- Available in zinc-plated, hot-dip galvanized, and stainless steel finishes.
Ensures protection against oxidation, rust, and extreme temperatures.
Compatible with Various Fastening Systems
- Clevis Pins, Shafts, and Axles – Used in automotive, railway, and marine applications.
Bolts & Nuts – Provides secondary locking for structural fasteners.
Thread Specifications & Precision Engineering
| Feature | Description | Application |
|---|---|---|
| Round Wire Cotter Pins | Traditional split-pin design with rounded cross-section | General mechanical fastening |
| Flat Cotter Pins | Provides greater surface contact for higher load applications | Automotive & industrial use |
| Hammer Lock Cotter Pins | Features hammered locking mechanism for high-vibration applications | Railway, heavy machinery |
| Tapered-End Cotter Pins | Allows easier insertion & removal in precision assemblies | Aerospace, defense |
Thread Fitment & Compliance
- Metric cotter pins conform to ISO 8751 & ISO 1234 tolerances, ensuring tight engagement with shafts & clevis pins.
- Imperial cotter pins meet ASME B18.8.2 & DIN 94 for universal compatibility.
Common Applications of Cotter Pins
- Automotive & Heavy Vehicles – Used for securing axles, suspension components, and braking systems.
- Railway & Aerospace Engineering – Ensures vibration-resistant fastening in train bogies, aircraft landing gear, and jet engines.
- Marine & Offshore Engineering – Provides corrosion-resistant fastening for ship components and offshore structures.
- Agricultural & Construction Equipment – Prevents loosening of tractor and excavator linkages.
- Industrial Machinery & Equipment – Secures shafts, gears, and rotating components in power transmission systems.
Why Choose Rajal Industries for Cotter Pins?
Manufactured to International Standards
Ensuring precision engineering, strength, and compliance.
Split-Leg & Hammer-Lock Designs for Secure Locking
Prevents loosening in high-load, high-vibration environments.
Customizable Variants Available
Offering tapered-end, flat, round, and high-strength cotter pins.
Bulk & Custom Orders
Ideal for automotive, aerospace, railway, and industrial applications.
Stringent Quality Control
Each batch undergoes tensile strength verification, corrosion resistance assessment, and mechanical load testing.
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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