Lock Nuts
Lock Nuts are specialized fastening components designed to resist loosening due to vibration, shock loads, and mechanical movement. These nuts incorporate self-locking features, such as nylon inserts, serrations, or deformed threads, ensuring secure fastening in automotive, aerospace, construction, and industrial machinery applications.
At Rajal Industries, we manufacture high-strength Lock Nuts conforming to ISO, ASME, and DIN standards, ensuring optimal thread engagement, vibration resistance, and long-term durability.
Sizes & Standards
| Size Range | Standards |
|---|---|
| Metric: M1.6 to M100 | ISO 2341 – Lock nuts for general industrial applications |
| Imperial: 1/4" to 1-1/2" | ASME B18.2.4.1 – American standard for self-locking nuts |
| ISO 7040 – Prevailing torque type hexagon nuts with non-metallic insert | |
| DIN 985 – German standard for nylon insert lock nuts |
Material & Strength Grades
| Material Type | Available Strength Grades | Industry Standards |
|---|---|---|
| Carbon Steel & Mild Steel | Class 4, 5, 8, 10, 12 | ISO 7040, DIN 985, ASME B18.2.4.1 |
| Stainless Steel (Corrosion Resistant) | A2-70 (SS 304), A4-80 (SS 316) | ISO 3506 |
| Alloy Steel (High Tensile Strength) | Class 8, 10, 12 | ISO 2341, DIN 985 |
- Heat-Treated for Maximum Strength –Lock nuts undergo quenching and tempering for superior load-bearing performance.
- Load Ratings Based on Material & Application:
- Carbon Steel Class 8 Lock Nut: 800-900 MPa tensile strength
- Stainless Steel A4-80 Lock Nut: 700-800 MPa corrosion-resistant strength
Locking Mechanisms & Engineering Features
Multiple Locking Mechanisms for Anti-Loosening Performance
- Nylon Insert Lock Nuts (DIN 985, ISO 7040) – Feature a non-metallic insert that grips the bolt thread, preventing vibration-induced loosening.
- All-Metal Lock Nuts (ISO 2341, ASME B18.2.4.1) – Use deformed threads or a conical top for permanent mechanical locking.
Serrated Flange Lock Nuts – Have radial serrations that bite into the mating surface, preventing rotation under load.
Prevailing Torque Lock Nuts – Use elliptical deformation in the threads to create a self-locking effect.
Hexagonal Profile for High Torque Transfer
- Provides uniform load distribution and secure wrench grip.
- Compatible with open-end wrenches, socket wrenches, and power tools.
Thread Profile for Secure Fastening
- Precision-machined coarse and fine threads for high-retention strength and anti-loosening properties.
Designed for reusable or single-use applications depending on the locking mechanism.
Compatible with Various Bolt & Stud Types
- Hex Head Bolts, Threaded Rods & Studs – Ensures high-torque, vibration-resistant fastening.
Structural & High-Tensile Bolts (ISO 4014, ASTM A325, DIN 6914) – Provides strong clamping force in dynamic applications.
Thread Specifications & Precision Engineering
| Thread Type | Description | Application |
|---|---|---|
| Coarse Thread (UNC/Metric) | Ensures quick engagement and strong grip | General-purpose fastening, industrial assembly |
| Fine Thread (UNF/Metric Fine) | Provides higher tensile strength & precise load transfer | Aerospace, automotive, heavy machinery |
| Fully Threaded Lock Nuts | Allows maximum engagement with bolts & studs | Structural applications, bridge construction |
| Partially Threaded Lock Nuts | Offers better clamping force & vibration resistance | Automotive, railway, power transmission |
Thread Fitment & Compliance
- Metric threads conform to ISO 6H tolerances, ensuring secure engagement and torque resistance.
- Imperial lock nuts meet ASME B18.2.4.1 and DIN 985 for universal compatibility.
Common Applications of Lock Nuts
- Automotive & Aerospace Industry – Used in engine mounts, chassis, suspension, and critical assemblies.
- Construction & Infrastructure – Ensures secure fastening in bridges, steel frameworks, and railway tracks.
- Industrial Machinery & Equipment – Provides vibration-resistant fastening in compressors, turbines, and pumps.
- Oil & Gas & Power Plants – Used in pipelines, refineries, and energy transmission lines.
- Renewable Energy & Wind Turbines – Fastens solar panel mounts, wind turbine structures, and electrical enclosures.
Why Choose Rajal Industries for Lock Nuts?
Manufactured to International Standards
Ensuring precision engineering, durability, and compliance.
High-Torque & Anti-Vibration Design
Engineered for secure fastening in critical applications.
Customizable Locking Features
Available in nylon insert, all-metal, and serrated designs.
Bulk & Custom Orders
Ideal for automotive, construction, and industrial use.
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