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.
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- All-Metal Lock Nuts (ISO 2341, ASME B18.2.4.1) – Use deformed threads or a conical top for permanent mechanical locking.
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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.
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Hexagonal Profile for High Torque Transfer
- Provides uniform load distribution and secure wrench grip.
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- Compatible with open-end wrenches, socket wrenches, and power tools.
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Thread Profile for Secure Fastening
- Precision-machined coarse and fine threads for high-retention strength and anti-loosening properties.
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Designed for reusable or single-use applications depending on the locking mechanism.
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Compatible with Various Bolt & Stud Types
- Hex Head Bolts, Threaded Rods & Studs – Ensures high-torque, vibration-resistant fastening.
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Structural & High-Tensile Bolts (ISO 4014, ASTM A325, DIN 6914) – Provides strong clamping force in dynamic applications.
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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.
Office Address
Plot no.8, Out side of shiyani ni pol, Satavara Para, Behind old bhijanshala, Nr. Jemabhuvani wadi, Bhogava road, Wadhavan, Surendranagar-363030.
Manufacturing Unit
R.S.No. 2912/P, B/h. Meldi maa temple,Old dedadra road, Wadhavan, Surendranagar, Gujarat-363030.
Call us
+91-846 036 2030
+91 8460362030
Email Us
rajalfast@gmail.com sales@rajalindustries.com