jambrass

Steel Lock nuts

Steel Lock nuts

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$10.13 / kg

kg

High-Strength Steel Lock Nuts: Secure Fastening Solutions for Critical Applications

We are one of the leading manufacturers and exporters of high-performance Steel Lock Nuts from India. We have been supplying superior quality industrial fasteners and vibration-resistant locknuts to the world market for many decades, establishing a formidable reputation for reliability, technical excellence, and competitive pricing. Our state-of-the-art manufacturing facility in Jamnagar is equipped with advanced machinery and is supported by a highly skilled engineering team dedicated to producing components that meet the most stringent international standards. Our Steel Lock Nuts are renowned for their exceptional clamping force retention, superior reusability, and excellent resistance to loosening under dynamic loads, making them the preferred choice for a multitude of automotive, aerospace, and heavy machinery applications. We specialize in providing both standard and customized locking fastener solutions, ensuring a perfect fit for your specific security and performance requirements. Our commitment extends beyond manufacturing to encompass robust customized packaging, timely global logistics, and unparalleled customer support, solidifying our position as a trusted partner in the global industrial supply chain.

Comprehensive Overview of Steel Lock Nuts

Steel Lock Nuts are specialized fasteners engineered to prevent loosening under vibration, thermal cycling, and dynamic loads, thereby maintaining critical clamp load in an assembly. Unlike standard nuts, they incorporate a prevailing torque or a positive locking feature that resists rotation relative to the bolt or mating part. The choice of Steel as the core material is strategic, leveraging its high tensile strength to achieve high preload forces, excellent fatigue resistance for long-term reliability, and the ability to be heat-treated for enhanced mechanical properties. These nuts are indispensable in applications where fastener failure could lead to catastrophic results, such as in automotive wheel assembliesaerospace control systemsheavy-duty construction equipment, and high-speed machinery. By providing a reliable, vibration-proof connection, prevailing torque lock nuts ensure the integrity and safety of the entire assembly throughout its service life.

In-Depth Look at Nylon Insert Lock Nuts (Nyloc)

Our Nylon Insert Lock Nuts, commonly known as Nyloc nuts, are one of the most widely used types of prevailing torque lock nuts. They feature a non-metallic, typically nylon, collar at one end. When the nut is threaded onto a bolt, the internal threads of the bolt engage with the nylon insert, which deforms elastically to create a strong frictional force that resists loosening. Manufactured from medium carbon steel like AISI 1035 or 1040, these nuts are often heat treated to Grade 5 or 8 equivalent for strength. The nylon insert provides excellent vibration resistance, is electrically insulating, and is corrosion-resistant to many environments. They are commonly used in automotive sub-assemblieselectronic enclosures, and general industrial machinery where reliable, reusable locking is required.

Technical Specifications: Nylon Insert Lock Nuts

Parameter Specification Standards
Material AISI 1035/1040 Carbon Steel
Heat Treatment Quenched and Tempered (Grade 5/8)
Locking Element Nylon 6/6 Collar
Temperature Range -40°C to +120°C (Nylon Dependent)
Reusability Good (Typically 5+ cycles)
Plating/Finish Zinc Plated, Phosphate, Geomet® ASTM F1941, ISO 4042
Standards DIN 985, ISO 7040, IFI 100

Advanced All-Metal Lock Nuts

For high-temperature applications or environments where a non-metallic insert is unsuitable, our All-Metal Lock Nuts provide a robust solution. This category includes several types, such as stainless steel lock nuts with a elliptical top section (DIN 980), two-way lock nuts with slots at both ends, and center lock nuts. These nuts create a prevailing torque through the elastic or plastic deformation of their threads or a specialized feature like a crimp. Manufactured from high-grade materials like AISI 304 or 316 Stainless Steel or alloy steel AISI 4140, they retain their locking ability at temperatures beyond the limits of nylon. The prevailing torque is generated as the deformed threads create an interference fit with the bolt threads. These nuts are essential in engine compartmentsexhaust systemsbrake assemblies, and chemical processing equipment.

Technical Specifications: All-Metal Lock Nuts

Parameter Specification Standards
Material AISI 4140 Alloy Steel, AISI 304/316 Stainless Steel
Heat Treatment For Alloy Steel: Quenched and Tempered
Locking Mechanism Top Elliptical Collar, Slotted & Crowned
Temperature Range Up to +800°C (Material Dependent)
Reusability Fair to Good (Depends on type and application)
Plating/Finish Zinc Flake (Geomet®), Xylan, Passivation
Standards DIN 980, DIN 6923, IFI 105, NAS 3350

Material Grades and International Standards

Our Steel Lock Nuts are manufactured from a range of internationally recognized steel grades to meet diverse application needs and regional specifications.

  • Carbon Steels (ASTM/AISI): AISI 1008, AISI 1035, AISI 1040

  • Alloy Steels (ASTM/AISI): AISI 4140, AISI 4340 (for high strength)

  • Stainless Steels (ASTM/AISI): AISI 304, AISI 316, AISI 316L (for corrosion resistance)

  • India (IS): IS 1367, IS 2269

Our products are designed and manufactured in compliance with international standards for quality and performance, including ISO 9001IFIsDINANSI, and JIS specifications. We can supply nuts conforming to ISO 898ASTM A563, and ASME B18.16.

Manufacturing Processes and Quality Assurance

The production of our steel lock nuts is a precision-driven process. It begins with the cold forging of wire rod using high-tonnage multi-station headers to create a near-net-shape blank, which ensures superior grain flow and strength. This is followed by thread rolling using precision dies, a cold-forming process that creates stronger, smoother threads compared to cutting. For all-metal lock nuts, secondary operations like slotting or crimping are performed on CNC machines. Heat treatment is a critical step for high-strength grades, involving controlled quenching and tempering to achieve the required mechanical properties. Each batch undergoes rigorous inspection, including dimensional checks with optical comparators, hardness testing (Rockwell and Vickers), salt spray testing per ASTM B117 for corrosion resistance, and functional testing of the prevailing torque. Our quality management system ensures full traceability from raw material to finished goods.

Plating and Finishing Options

To ensure longevity and performance in various operating environments, we offer a range of protective finishes:

  • Electro-Zinc Plating (Blue/Yellow Chromate): A cost-effective, general-purpose finish providing good corrosion resistance.

  • Zinc Flake Coatings (Geomet®, Delta Protekt): A superior, non-electrolytic coating offering excellent corrosion resistance (up to 1000+ hours salt spray) and high-temperature stability, often used in automotive.

  • Hot-Dip Galvanizing: A thick, rugged zinc coating for superior protection in harsh outdoor and construction environments.

  • Phosphate Coating: Often used as a base for oil or wax, providing good corrosion resistance and excellent paint adhesion.

  • Xylan / PTFE Coatings: Provide a low-friction, dry-lubricated surface for specific torque-tension requirements.

  • Passivation (for Stainless Steel): Enhances the natural corrosion resistance of Stainless Steel.

Industries Served and Performance Metrics

Our components are critical in sectors where fastener security is non-negotiable:

  • Automotive and Transportation (Wheels, Engines, Chassis)

  • Aerospace and Defense (Control Surfaces, Access Panels)

  • Heavy Equipment and Construction Machinery

  • Oil & Gas and Energy (Drilling Rigs, Turbines)

  • Industrial Machinery and Robotics

  • Electronics and Consumer Appliances

Key Performance Metrics: Our lock nuts are characterized by their proof loadultimate tensile strengthhardnessprevailing torque (on and off), corrosion resistance rating, and temperature rating.

Frequently Asked Questions (FAQ)

1. What is the difference between a prevailing torque nut and a free-spinning nut?
prevailing torque nut, like a Nyloc or all-metal lock nut, provides a consistent resistance to rotation throughout its travel, even before it seats. A free-spinning nut spins freely until it is tightened against a surface, relying on friction to prevent loosening.

2. Can Nyloc nuts be reused?
While Nylon Insert Lock Nuts offer good reusability, it is generally recommended to limit reuse to 5 cycles as the nylon insert can wear, reducing its locking effectiveness. For critical applications, always consult the manufacturer’s guidelines.

3. How do I select the right lock nut for a high-temperature application?
For temperatures consistently above 120°C, a Nyloc nut is unsuitable. In these cases, an all-metal lock nut made from heat-resistant steel or Stainless Steel should be selected, as they can perform reliably at much higher temperatures.

4. What is the standard turnaround time for a custom lock nut order?
Our standard lead time for custom projects is typically 4 to 6 weeks, which includes tooling fabrication, sample approval, and production. We offer expedited services for urgent requirements.

5. What does the “Grade” of a steel lock nut indicate?
The Grade (e.g., 5, 8, 10) indicates the nut’s strength level, specifically its proof load and hardness. Higher grade nuts are made from stronger materials and are heat-treated to withstand higher clamping forces.

6. Do you provide certifications for your lock nuts?
Yes, we can provide mill test certificates for raw material and material test certificates for finished goods, including chemical and mechanical property reports, upon request.

7. Can you manufacture lock nuts with left-hand threads?
Absolutely. Our custom engineering capabilities include producing lock nuts with left-hand threads, special thread series (UNF, UNC, Metric Fine), and non-standard dimensions.

Why Choose Jamnagar Brass Components for Steel Lock Nuts?

  • Three Decades of Metal Forming Expertise: Our extensive experience in cold forging and precision machining ensures we understand the critical factors in producing reliable, high-strength fasteners.

  • Unmatched Customization and Engineering Support: We offer fully customized locking solutions, including special sizes, materials, plating, and proprietary designs, backed by direct engineering support.

  • Proven Manufacturing Flexibility: We efficiently handle both high-volume OEM orders and small-batch, specialized projects, adapting our production scheduling to your timeline.

  • Superior Quality and Traceability: Our rigorous quality management system and in-house testing capabilities ensure that every batch of lock nuts meets its specified performance and safety criteria.

  • Robust Global Supply Chain: As seasoned exporters from India, we have the logistical expertise to deliver products safely and on time to any global destination, supported by professional documentation and customized packaging.

Packaging and Shipping

We ensure our precision fasteners are protected and organized in transit. Our standard packaging includes rust-preventative VCI bags, bulk boxes, or custom-designed plastic reel packs for automated assembly. We offer customized packaging solutions, including branding with your company’s logo and barcoding for your inventory management. We ship via reliable international air and sea freight partners.

Glossary of Terms

  • Prevailing Torque: The torque required to run a nut down a bolt thread under no load. This is the locking action that resists vibration.

  • Clamp Load: The force exerted by a fastener when it is tightened, which holds the joint members together. It is the most critical factor in a bolted joint.

  • Reusability: The number of times a lock nut can be disassembled and reassembled while still maintaining its specified locking performance.

  • Cold Forging: A metal shaping process performed at room temperature that creates parts with high strength and excellent grain flow.

  • Salt Spray Test: An accelerated corrosion test method where a product is exposed to a salt fog to simulate and assess its corrosion resistance over time.


Secure Your Critical Assemblies Today!

Ensure the integrity and safety of your products with Jamnagar Steel Lock Nuts. Contact our technical sales team today for a competitive quotation, a detailed product catalog, or to discuss your custom locking fastener requirements.

Jamnagar Brass Components
Office Address: 1406, 14th Floor, Dalamal Tower, Nariman Point, Mumbai – 400021, Maharashtra, INDIA
Factory Address: Plot 10B, GIDC Industrial Estate, Shanker Tekari, Udyognagar, Jamnagar, Gujarat, India – 361004
Phone: +91-22-43449300 / +91-22-43449323
Email: sales@jambrass.com
Contact Person: Mr. Mehul Vora

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