Star Washers
Star Washers are locking washers with internal or external teeth designed to enhance grip, prevent loosening, and improve electrical conductivity. Their serrated edges bite into the surface, increasing friction and ensuring vibration-resistant fastening. These washers are commonly used in automotive, electrical, aerospace, machinery, and industrial applications where a strong locking mechanism or reliable grounding connection is required.
At Rajal Industries, we manufacture precision-engineered Star Washers conforming to ISO, ASME, and DIN standards, ensuring high-retention force, corrosion resistance, and long-lasting durability in demanding environments.
Sizes & Standards
| Size Range | Standards |
|---|---|
| Metric: M2 to M36 | ISO 7091 – International standard for lock washers |
| Imperial: 1/4" to 1-1/2" | ASME B18.21.1 – U.S. standard for lock washers |
| DIN 6797 – German standard for toothed star lock washers |
Material & Strength Grades
- Heat-Treated for Maximum Hardness & Wear Resistance –Star washers undergo hardening for improved shear strength, fatigue resistance, and locking performance.
- Load Ratings Based on Material & Application:
- Carbon Steel Class 8.8 Star Washer: 800-900 MPa tensile strength
- Stainless Steel A4-80 Star Washer: 700-800 MPa corrosion-resistant strength
| Material Type | Available Strength Grades | Industry Standards |
|---|---|---|
| Carbon Steel & Hardened Steel | Class 5.8, 8.8, 10.9 | ISO 7091, DIN 6797, ASME B18.21.1 |
| Stainless Steel (Corrosion Resistant) | A2-70 (SS 304), A4-80 (SS 316) | ISO 3506, DIN 6797 |
| Alloy Steel (High Load-Bearing Capacity) | Class 10.9, 12.9 | ISO 7091, DIN 6797 |
| Phosphor Bronze & Brass (Non-Corrosive & Electrical Applications) | Custom Hardness Ratings | ISO 7091, ASME B18.21.1 |
Star Washer Design & Engineering Features
Internal & External Tooth Variants for Maximum Grip
- Internal Star Washers – Teeth positioned inside the washer for better grip on bolts & screws.
- External Star Washers – Teeth placed on the outer edge for superior locking against surfaces.
Self-Locking Mechanism for Vibration Resistance
- Teeth embed into mating surfaces, preventing loosening due to shock, vibration, or dynamic loads.
- Improves load distribution and joint stability.
Ideal for Electrical Grounding & Conductivity
- Enhances contact surface area, improving electrical grounding in automotive and electronic applications.
- Used in circuit boards, connectors, and grounding terminals.
Corrosion-Resistant Finishes for Longevity
- Available in stainless steel, zinc-plated, phosphor bronze, and black oxide finishes.
- Protects against moisture, oxidation, and harsh environmental conditions.
Multiple Variants for Specialized Applications
- Heavy-Duty Star Washers – Designed for high-load structural applications.
- Light-Duty Toothed Washers – Used for delicate electronic components.
Thread Specifications & Precision Engineering
| Feature | Description | Application |
|---|---|---|
| Internal Tooth Star Washers (DIN 6797J) | Provides secure grip around the bolt/screw head | Electronics, light-duty mechanical assemblies |
| External Tooth Star Washers (DIN 6797A) | Offers higher locking force against the fastening surface | Automotive, machinery, heavy equipment |
| Hardened Steel Star Washers | Ensures high-shear strength & durability | Structural fastening, railways, aerospace |
| Phosphor Bronze Spring Washers | Provides corrosion resistance & electrical conductivity | Marine, electrical grounding applications |
Thread Fitment & Compliance
- Metric star washers conform to ISO 7091 & DIN 6797 tolerances, ensuring perfect fit with metric fasteners.
- Imperial star washers meet ASME B18.21.1 standards for universal compatibility.
Common Applications of Star Washers
- Automotive & Heavy Vehicles – Used for electrical grounding, vibration-resistant connections, and suspension components.
- Electrical & Electronics Industry – Ensures secure grounding in circuit boards, battery terminals, and electrical panels.
- Industrial Machinery & Heavy Equipment – Provides anti-loosening protection in high-stress, high-vibration environments.
- Aerospace & Defense Equipment – Used in aircraft structural components and high-performance assemblies.
- Marine & Offshore Engineering – Offers rust-resistant fastening for shipbuilding, offshore platforms, and marine hardware.
Why Choose Rajal Industries for Star Washers?
Manufactured to International Standards
Ensuring precision engineering, strength, and compliance.
Serrated & Self-Locking Design for Secure Fastening
Prevents loosening in high-load, high-vibration environments.
Customizable Variants Available
Offering internal, external, and heavy-duty star washers.
Bulk & Custom Orders
Ideal for automotive, electrical, industrial, and structural 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
