Weld Nuts
Weld Nuts are internally threaded fasteners designed to be permanently attached to metal surfaces via welding, ensuring high-strength, secure fastening in structural, automotive, and sheet metal applications. These nuts eliminate the need for loose backing components, providing a strong, vibration-resistant hold while allowing easy assembly and disassembly of mating components.
At Rajal Industries, we manufacture precision-engineered Weld Nuts conforming to DIN and ISO standards, ensuring strong weldability, superior thread engagement, and long-term durability.
Sizes & Standards
| Size Range | Standards |
|---|---|
| Metric: M4 to M20 | DIN 929 – Hex weld nuts with flange for welding |
| Imperial: 1/4" to 3/4" | ISO 21670 – Standard for projection weld nuts |
| General nut standards for structural applications |
Material & Strength Grades
| Material Type | Available Strength Grades | Industry Standards |
|---|---|---|
| Carbon Steel & Mild Steel | Class 4, 5, 8, 10 | DIN 929, ISO 21670 |
| Stainless Steel (Corrosion Resistant) | A2-70 (SS 304), A4-80 (SS 316) | ISO 3506 |
| Alloy Steel (High Tensile Strength) | Class 8, 10, 12 | ISO 21670, DIN 929 |
- Heat-Treated for Maximum Strength –Weld nuts undergo quenching and tempering for enhanced weldability and load-bearing capacity.
- Load Ratings Based on Material & Application:
- Carbon Steel Class 8 Weld Nut: 800-900 MPa tensile strength
- Stainless Steel A4-80 Weld Nut Nut: 700-800 MPa corrosion-resistant strength
Weld Nut Design & Engineering Features
Permanent Attachment via Welding for High Load Capacity
- Ensures secure, high-strength fastening without the need for a separate bolt or backing plate.
- Designed for quick, automated welding in mass production.
Multiple Weld Nut Designs for Versatile Applications
- Hex Weld Nuts (DIN 929) – Feature six-sided geometry with weld projections for easy alignment.
- Projection Weld Nuts (ISO 21670) – Have protruding weld points for better fusion with metal surfaces.
- Flange Weld Nuts – Offer increased bearing surface for heavy-load applications.
Optimized for High-Torque & Vibration Resistance
- Precision-machined coarse and fine threads for strong engagement and anti-loosening properties.
Available with self-locating features to ensure consistent alignment during welding.
Compatible with Various Welding Methods
- Spot Welding & Projection Welding – Used in automotive and heavy machinery assembly.
TIG/MIG Welding – Ensures permanent installation in structural applications.
Thread Specifications & Precision Engineering
| Thread Type | Description | Application |
|---|---|---|
| Coarse Thread (UNC/Metric) | Provides fast engagement and strong grip | Structural, heavy-duty applications |
| Fine Thread (UNF/Metric Fine) | Ensures higher tensile strength & precise load distribution | Automotive, aerospace, industrial enclosures |
| Fully Threaded Weld Nuts | Allows maximum engagement and secure fastening | Metal fabrication, machinery assembly |
| Partially Threaded Weld Nuts | Offers better clamping force & structural strength | Construction, heavy equipment |
Thread Fitment & Compliance
- Metric threads conform to ISO 6H tolerances, ensuring precise engagement with bolts and fasteners.
- Imperial weld nuts meet DIN 929 and ISO 21670 for industrial and automotive applications.
Common Applications of Weld Nuts
- Automotive & Heavy Machinery – Used in vehicle chassis, suspension systems, and frame assembly.
- Structural Steel & Construction – Provides strong, vibration-resistant fastening in metal frameworks.
- Sheet Metal Fabrication & Aerospace Engineering – Ensures secure, permanent fastening in aircraft and lightweight structures.
- Railway & Transportation Infrastructure – Used in railway carriages, metro systems, and bridges.
- Medical Devices & Electronic Enclosures – Fastens steel casings, mounting brackets, and industrial panels.
Why Choose Rajal Industries for Weld Nuts?
Manufactured to International Standards
Ensuring precision engineering, weldability, and compliance.
Customizable Designs for Specific Welding Applications
Available in hex, round, and projection weld nut designs.
High-Torque & Vibration-Resistant Construction
Engineered for secure fastening in high-load environments.
Bulk & Custom Orders
Ideal for automotive, construction, and heavy machinery sectors.
Stringent Quality Control
Each batch undergoes torque testing, thread fitment verification, and welding strength 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