Structural Washers
Structural Washers are thick, high-strength washers designed to distribute load, improve joint stability, and prevent bolt stress concentration in structural steel connections, bridges, and heavy-duty applications. These washers enhance bolt performance in high-tensile fastening systems and are commonly used with HSFG (High-Strength Friction Grip) bolts and structural fasteners.
At Rajal Industries, we manufacture precision-engineered Structural Washers conforming to ASTM, ISO, and EN standards, ensuring maximum durability, high load-bearing capacity, and corrosion resistance in demanding structural applications.
Sizes & Standards
| Size Range | Standards |
|---|---|
| Metric: M16 to M36 | ISO 7090 – Standard for structural flat washers |
| Imperial: 3/4" to 1-1/2" | ASTM F436 – U.S. standard for hardened steel structural washers |
| EN 14399-6 – European standard for preloaded structural bolting washers |
Material & Strength Grades
| Material Type | Available Strength Grades | Industry Standards |
|---|---|---|
| Hardened Carbon Steel & Alloy Steel | Class 5.8, 8.8, 10.9 | ASTM F436, ISO 7090, EN 14399-6 |
| Stainless Steel (Corrosion Resistant) | A2-70 (SS 304), A4-80 (SS 316) | ISO 3506, EN 14399-6 |
| Hot-Dip Galvanized Steel (Heavy-Duty Coatings) | Class 8.8, 10.9 | ASTM F436, ISO 7090 |
| Phosphor Bronze & Brass (Electrical & Non-Corrosive Applications) | Custom Hardness Ratings | ISO 7090, EN 14399-6 |
- Heat-Treated for Maximum Hardness & Load Retention –Structural washers undergo hardening and stress-relief processes for enhanced durability and impact resistance.
- Load Ratings Based on Material & Application:
- Hardened Steel ASTM F436 Washer: 800-900 MPa tensile strength
- Stainless Steel A4-80 Washer: 700-800 MPa corrosion-resistant strength
Structural Washer Design & Engineering Features
Extra Thick & Hardened Construction for Heavy Loads
- Prevents bolt deformation and material fatigue in high-tensile applications.
Distributes clamping force evenly to reduce joint stress concentration.
Designed for Structural Steel & High-Strength Bolting Systems
- Used with HSFG bolts, structural hex bolts, and preloaded bolt assemblies.
Ensures secure connections in steel structures, bridges, and infrastructure projects.
Available in Flat, Chamfered, and Beveled Variants for Specific Uses
- Flat Structural Washers (ISO 7090) – Standard for general structural applications.
Chamfered Structural Washers – Used for bolted connections requiring precise seating.
Beveled Structural Washers – Designed for angled surfaces and non-parallel bolted joints.
Corrosion-Resistant Coatings for Harsh Environments
- Available in hot-dip galvanized, zinc-plated, and black oxide finishes.
Ensures long-term durability in marine, offshore, and outdoor applications.
Compatible with Preloaded Bolt Assemblies for Secure Fastening
- Meets European and ASTM standards for friction grip and tension control bolt systems.
Thread Specifications & Precision Engineering
| Feature | Description | Application |
|---|---|---|
| Flat Structural Washers (ISO 7090) | Provides uniform load distribution & prevents bolt embedment | Bridges, industrial structures |
| Chamfered Structural Washers | Designed for preloaded bolt assemblies | Heavy-duty machinery, wind turbines |
| Beveled Structural Washers | Used for angled structural connections | Railways, offshore platforms |
| Hot-Dip Galvanized Structural Washers | Ensures high corrosion resistance | Marine, construction |
Thread Fitment & Compliance
- Metric structural washers conform to ISO 7090 & EN 14399-6 tolerances, ensuring secure fitment with metric fasteners.
- Imperial structural washers meet ASTM F436 standards for universal compatibility.
Common Applications of Structural Washers
- Steel Construction & Infrastructure – Used in bridge supports, high-rise buildings, and industrial structures.
- Railway & Heavy Engineering – Ensures stable bolted connections in railway tracks and locomotives.
- Industrial Machinery & Heavy Equipment – Provides load-bearing reinforcement in heavy-duty machinery.
- Wind Energy & Power Generation – Used in wind turbine towers and transmission lines.
- Marine & Offshore Engineering – Offers corrosion-resistant fastening for offshore platforms, ships, and docks.
Why Choose Rajal Industries for Structural Washers?
Manufactured to International Standards
Ensuring precision engineering, strength, and compliance.
Extra Thick & Hardened Design for Maximum Load-Bearing Capacity
Prevents bolt deformation and structural failure.
Customizable Variants Available
Offering flat, chamfered, and beveled structural washers.
Bulk & Custom Orders
Ideal for construction, infrastructure, railway, and wind energy applications.
Stringent Quality Control
Each batch undergoes hardness 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