External & Internal Circlips
Circlips, also known as snap rings or retaining rings, are mechanical fasteners designed to secure rotating or moving components onto shafts or inside bores. These fasteners provide axial retention, preventing lateral movement while allowing for easy assembly and disassembly in automotive, aerospace, machinery, and industrial equipment applications.
At Rajal Industries, we manufacture precision-engineered External & Internal Circlips conforming to ISO and DIN standards, ensuring secure fitting, high-strength retention, and long-term durability for demanding fastening applications.
Sizes & Standards
| Circlip Type | Size Range | Standards |
|---|---|---|
| External Circlips | Diameters: 5mm to 200mm | ISO 7226 – International standard for external circlips |
| DIN 471 – German standard for external retaining rings | ||
| Internal Circlips | Diameters: 5mm to 200mm | ISO 7227 – International standard for internal circlips |
| DIN 472 – German standard for internal retaining rings |
Material & Strength Grades
| Material Type | Available Strength Grades | Industry Standards |
|---|---|---|
| Carbon Steel & Hardened Steel | Class 5.8, 8.8, 10.9 | DIN 471, DIN 472, ISO 7226, ISO 7227 |
| Stainless Steel (Corrosion Resistant) | A2-70 (SS 304), A4-80 (SS 316) | ISO 3506, DIN 471, DIN 472 |
| Phosphor Bronze & Brass (Non-Corrosive & Electrical Applications) | Custom Hardness Ratings | General Circlip Standards |
- Heat-Treated for Maximum Hardness & Fatigue Resistance –Circlips undergo hardening and stress relief for improved flexibility, retention force, and wear resistance.
- Load Ratings Based on Material & Application:
- Carbon Steel Class 8.8 Circlips: 800-900 MPa tensile strength
- Stainless Steel A4-80 Circlips: 700-800 MPa corrosion-resistant strength
External & Internal Circlip Design & Engineering Features
Snap-Fit Retention for Secure Shaft & Bore Locking
- External circlips grip around the outside of a shaft, ensuring high axial retention.
Internal circlips snap inside a housing or bore, securing rotating components.
High-Retention Force for Precision Fastening
- Provides secure axial positioning for gears, bearings, pulleys, and machine parts.
Designed for high-speed rotating components.
Flexible & Spring-Like Resilience for Repeated Use
- Allows for easy installation and removal using circlip pliers.
Maintains consistent grip even after multiple assemblies.
Corrosion-Resistant Coatings for Longevity
- Available in stainless steel, black oxide, phosphate-coated, and zinc-plated finishes.
Ensures long-term durability in industrial, automotive, and marine environments.
Multiple Variants for Specialized Applications
- Heavy-Duty Circlips – Designed for high-load, high-speed machinery.
Lightweight Circlips – Used for precision instruments and delicate assemblies.
Specialized Retaining Rings – Custom-engineered for aerospace and defense applications.
Thread Specifications & Precision Engineering
| Feature | Description | Application |
|---|---|---|
| External Circlips (DIN 471) | Ensures secure grip on shafts & rotating components | Automotive, heavy machinery |
| Internal Circlips (DIN 472) | Provides axial retention inside bores & housings | Aerospace, power tools |
| Heavy-Duty Circlips | Designed for high-load industrial machinery | Railways, defense equipment |
| Corrosion-Resistant Stainless Steel Circlips | Ensures long-lasting durability in marine & chemical environments | Offshore, shipbuilding |
Thread Fitment & Compliance
- Metric circlips conform to ISO 7226 & ISO 7227 tolerances, ensuring perfect fitment with standard fasteners.
- Imperial circlips are manufactured per DIN 471 & DIN 472 specifications for universal compatibility.
Common Applications of External & Internal Circlips
- Automotive & Heavy Vehicles – Used for gearboxes, transmissions, axles, and brake systems.
- Industrial Machinery & Heavy Equipment – Provides secure shaft locking in motors, bearings, and pulleys.
- Aerospace & Defense Engineering – Used in aircraft landing gears, missile guidance systems, and precision instruments.
- Power Transmission & Mechanical Assemblies – Secures rotating components in electric motors, turbines, and generators.
- Marine & Offshore Engineering – Offers rust-resistant fastening for shipbuilding, offshore platforms, and underwater equipment.
Why Choose Rajal Industries for External & Internal Circlips?
Manufactured to International Standards
Ensuring precision engineering, strength, and compliance.
Spring-Tensioned & High-Retention Design for Secure Fastening
Prevents shaft & bore displacement in dynamic load applications.
Customizable Variants Available
Offering heavy-duty, corrosion-resistant, and specialized circlips.
Bulk & Custom Orders
Ideal for automotive, aerospace, power transmission, and heavy machinery applications.
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