Serrated Lock Washers
Serrated Lock Washers are specialized locking washers with serrations or ridges on the surface that enhance grip, prevent self-loosening, and improve joint stability in high-vibration applications. These washers create a strong frictional hold between the bolt and the surface, making them ideal for automotive, aerospace, industrial machinery, and electrical grounding applications.
At Rajal Industries, we manufacture precision-engineered Serrated Lock Washers conforming to ISO, ASME, and DIN standards, ensuring superior locking performance, high corrosion resistance, and maximum torque retention in demanding fastening applications.
Sizes & Standards
| Size Range | Standards |
|---|---|
| Metric: M2 to M36 | ISO 7091 – International standard for locking washers |
| Imperial: 1/4" to 1-1/2" | ASME B18.22.1 – U.S. standard for disc compression washers |
| DIN 6798 – German standard for serrated lock washers |
Material & Strength Grades
| Material Type | Available Strength Grades | Industry Standards |
|---|---|---|
| Carbon Steel & Hardened Steel | Class 5.8, 8.8, 10.9 | DIN 6798, ISO 7091, ASME B18.21.1 |
| Stainless Steel (Corrosion Resistant) | A2-70 (SS 304), A4-80 (SS 316) | ISO 3506, DIN 6798 |
| Alloy Steel (High Shear Strength) | Class 10.9, 12.9 | ISO 7091, DIN 6798 |
| Phosphor Bronze & Brass (Electrical & Corrosion-Resistant Applications) | Custom Hardness Ratings | ISO 7091, ASME B18.21.1 |
- Heat-Treated for Maximum Hardness & Wear Resistance –Serrated lock washers undergo hardening to enhance durability, mechanical grip, and fatigue resistance.
- Load Ratings Based on Material & Application:
- Carbon Steel Class 8.8 Serrated Washer: 800-900 MPa tensile strength
- Stainless Steel A4-80 Serrated Washer: 700-800 MPa corrosion-resistant strength
Serrated Lock Washer Design & Engineering Features
Self-Locking Serrated Teeth for Secure Grip
- The serrations bite into the bolt head and mating surface, preventing loosening due to vibration or dynamic loads.
Enhances joint stability, torque retention, and anti-rotation properties.
Available in External & Internal Serration Variants for Different Applications
- External Serrated Lock Washers (DIN 6798A) – Serrations on the outer edge for higher locking force on surfaces.
Internal Serrated Lock Washers (DIN 6798J) – Serrations on the inner edge for better grip around the bolt head.
Combination Serrated Washers (DIN 6798V) – Features both internal and external serrations for dual locking action.
Increased Frictional Resistance for High-Vibration Applications
- Creates higher surface contact, making it ideal for high-speed, high-torque assemblies.
Prevents loosening in dynamic machinery, automotive, and aerospace fastening systems.
Corrosion-Resistant Coatings for Harsh Environments
- Available in stainless steel, zinc-plated, black oxide, and phosphor bronze finishes.
Ensures long-term durability in marine, aerospace, and industrial applications.
High-Torque Retention for Heavy-Duty Applications
- Used in electrical grounding, machinery fastenings, and structural joints requiring anti-loosening properties.
Compatible with HSFG bolts, automotive nuts, and industrial machine screws.
Thread Specifications & Precision Engineering
| Feature | Description | Application |
|---|---|---|
| External Serrated Lock Washers (DIN 6798A) | Provides high locking force against fastening surfaces | Industrial machinery, automotive |
| Internal Serrated Lock Washers (DIN 6798J) | Ensures better grip around bolt heads | Electrical panels, aerospace |
| Combination Serrated Lock Washers (DIN 6798V) | Dual serration for maximum friction & anti-loosening | Heavy machinery, vibration-resistant assemblies |
| Corrosion-Resistant Serrated Lock Washers | Offers long-lasting durability in harsh environments | Marine, offshore, defense |
Thread Fitment & Compliance
- Metric serrated lock washers conform to DIN 6798 & ISO 7091 tolerances, ensuring perfect fitment with metric fasteners.
- ImperImperial serrated lock washers meet ASME B18.21.1 standards for universal compatibility.ial spring washers meet ASME B18.21.1 standards for universal compatibility.
Common Applications of Serrated Lock Washers
- Automotive & Heavy Vehicles – Used for vibration-resistant fastening in chassis, engine mounts, and brake assemblies.
- Electrical & Electronics Industry – Ensures secure grounding and conductivity in circuit boards, battery terminals, and electrical enclosures.
- Industrial Machinery & Heavy Equipment – Provides high-torque retention in bolted assemblies under extreme loads.
- Aerospace & Defense Equipment – Used in aircraft structures, military vehicles, and precision engineering applications.
- Marine & Offshore Engineering – Offers rust-resistant fastening for shipbuilding, offshore platforms, and marine electrical connections.
Why Choose Rajal Industries for Serrated Lock 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 dual-serrated lock washers.
Bulk & Custom Orders
Ideal for automotive, electrical, industrial, and structural applications.
Stringent Quality Control
Each batch undergoes torque resistance 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