Square Nuts
Square Nuts are four-sided internally threaded fasteners designed to provide increased surface contact, high torque resistance, and strong load-bearing capability. Their large gripping area reduces stress on fastened materials, making them ideal for heavy machinery, railway tracks, bridge construction, and wooden structures.
At Rajal Industries, we manufacture precision-engineered Square Nuts conforming to ASME and DIN standards, ensuring durability, anti-loosening performance, and high tensile strength.
Sizes & Standards
| Size Range | Standards |
|---|---|
| Metric: M5 to M36 | DIN 557 – Standard for square nuts with coarse thread |
| Imperial: 1/4" to 1-1/2" | ASME B18.2.2 – American standard for square nuts |
| No specific ISO metric standard, but general industry usage |
Material & Strength Grades
| Material Type | Available Strength Grades | Industry Standards |
|---|---|---|
| Carbon Steel & Mild Steel | Class 4, 5, 8, 10, 12 | DIN 557, ASME B18.2.2 |
| Stainless Steel (Corrosion Resistant) | A2-70 (SS 304), A4-80 (SS 316) | ISO 3506 |
| Hardened Steel (High Tensile Strength) | Class 8, 10, 12 | DIN 557, ASME B18.2.2 |
- Heat-Treated for Maximum Strength –Square nuts undergo quenching and tempering for enhanced mechanical properties and load distribution.
- Load Ratings Based on Material & Application:
- Carbon Steel Class 8 Square Nut: 800-900 MPa tensile strength
- Stainless Steel A4-80 Square Nut: 700-800 MPa corrosion-resistant strength
Square Nut Design & Engineering Features
Larger Surface Area for High Load Distribution
- Provides better gripping strength compared to hex nuts.
- Reduces stress on bolted joints, making it ideal for soft materials like wood and aluminum.
High Torque Resistance for Secure Fastening
- The four-sided shape prevents slipping when secured in slots or tight spaces.
Allows manual tightening with pliers or wrenches in confined areas.
Thread Profile for Secure Fastening
- Available in coarse and fine threads for optimized engagement and anti-loosening performance.
Designed for repeatable use without thread damage or deformation.
Compatible with Various Bolt & Stud Types
- Hex Head Bolts, Carriage Bolts, and Threaded Rods – Ensures strong mechanical locking in heavy-duty applications.
Structural & High-Tensile Bolts – Used in load-bearing connections in bridges, railways, and construction.
Thread Specifications & Precision Engineering
| Thread Type | Description | Application |
|---|---|---|
| Coarse Thread (UNC/Metric) | Ensures fast engagement and strong grip | General-purpose fastening, industrial assembly |
| Fine Thread (UNF/Metric Fine) | Provides higher tensile strength & precise load transfer | Aerospace, heavy machinery, high-load structures |
| Fully Threaded Square Nuts | Allows maximum engagement and secure fastening | Structural applications, railway construction |
| Partially Threaded Square Nuts | Offers better shear strength & torque resistance | Automotive, agricultural equipment |
Thread Fitment & Compliance
- Metric threads conform to ISO 6H tolerances, ensuring precise thread engagement and torque control.
- Imperial square nuts meet ASME B18.2.2 and DIN 557 for industrial and construction applications.
Common Applications of Square Nuts
- Structural Engineering & Construction – Used in bridges, tunnels, and steel framework connections.
- Railway Tracks & Transportation Infrastructure – Ensures vibration-resistant fastening in railway sleepers and steel beams.
- Automotive & Heavy Machinery – Provides strong, load-bearing connections in industrial equipment and heavy-duty vehicles.
- Woodworking & Furniture Manufacturing – Used in timber framing, woodworking clamps, and assembly joints.
- Agriculture & Farm Equipment – Ensures durable fastening in tractors, plows, and irrigation systems.
Why Choose Rajal Industries for Square Nuts?
Manufactured to International Standards
Ensuring precision engineering, strength, and compliance.
High-Torque & Anti-Loosening Design
Engineered for secure fastening in high-load applications.
Customizable Designs Available
Offering coarse, fine, and custom-threaded square nuts.
Bulk & Custom Orders
Ideal for construction, railway, and heavy engineering sectors.
Stringent Quality Control
Each batch undergoes torque testing, thread fitment verification, and impact resistance checks.
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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