Brass Lock Nuts, Brass Locking Nuts

Premium Brass Lock Nuts & Brass Locking Nuts
Brass Lock nuts, Brass Locking nuts, Brass half nuts, Metric Lock nuts
Brass BAck nuts, Brass thin Nuts, Brass Metric Lock nuts, Brass Locking nuts

We are one of the leading manufacturers and exporters of Brass Lock Nuts and Brass Locking Nuts from India. We have been supplying precision-engineered Brass fasteners including Brass Back Nuts , Brass Check Nuts, Brass Locking nuts, UNC and UNEF Lock Nuts, Double chamfered Brass nuts, Metric Brass locking nuts etc. to the world market for many decades. Our comprehensive range includes Brass Metric Lock Nuts, Brass UNEF Lock Nuts, Brass Thin Nuts, and specialized variants like Nickel Plated Brass Lock Nuts and Brass Cable Gland Lock Nuts. With over three decades of experience in precision machining and manufacturing, we have established ourselves as a trusted partner for industries across the globe. Our state-of-the-art manufacturing facilities utilize advanced CNC machinery and quality control systems to ensure consistent production of high-grade Brass Lock Nuts that meet international standards including IS, ASTM, DIN, BS, and JIS specifications. We serve diverse industries including automotive, marine, electrical, telecommunications, plumbing, and industrial equipment sectors with our superior quality Brass Locking solutions. Our commitment to excellence, competitive pricing, and timely delivery has made us the preferred choice for customers in USA, Europe, Middle East, and Asia-Pacific regions.

Product Range – Brass Lock Nuts & Locking Nuts

Brass Lock Nuts

Our premium Brass Lock Nuts are precision-engineered fasteners designed to provide secure locking mechanism in threaded applications. These nuts feature a distinctive design with deformed threads or nylon inserts that create resistance against loosening due to vibration or rotational forces. Manufactured from high-grade Brass alloys including CuZn39Pb3 (CZ121) and CuZn36 (CZ107), these lock nuts offer excellent corrosion resistance and durability. The Brass Lock Nuts are available in standard metric and imperial thread pitches, with hexagonal profiles for easy installation using standard spanners and socket tools.

Brass Metric Lock Nuts

Brass Metric Lock Nuts are specifically manufactured to metric thread standards (M3 to M100) and comply with DIN 985, ISO 7040, and IS 5370 specifications. These metric locking nuts feature precision-cut metric threads with standard pitch configurations and are ideal for European and international applications. Our Brass Metric Lock Nuts undergo rigorous quality testing to ensure dimensional accuracy, thread integrity, and optimal locking torque characteristics. The metric threading provides superior engagement and load distribution compared to conventional threaded fasteners.

Brass Locking Nuts

Brass Locking Nuts encompass our comprehensive range of self-locking threaded fasteners that prevent loosening through various mechanical and chemical mechanisms. These include prevailing torque nuts, deformed thread nuts, and insert-type locking nuts. Our Brass Locking Nuts are engineered to maintain consistent clamping force and prevent backing-out in high-vibration environments. They are extensively used in automotive assemblies, marine hardware, electrical panel boards, and industrial machinery where reliable fastening is critical.

Brass UNEF Lock Nuts

Brass UNEF Lock Nuts (Unified National Extra Fine) are precision-threaded fasteners conforming to ASME B18.2.2 standards with fine thread pitch for enhanced holding power. These specialized lock nuts feature extra-fine threading that provides superior thread engagement and increased tensile strength compared to standard UNC threads. Our Brass UNEF Lock Nuts are manufactured with precise thread tolerance class 2B and are ideal for thin-wall applications, precision instruments, and aerospace components where maximum thread engagement is required within limited space.

Brass Thin Nuts

Brass Thin Nuts are low-profile locking fasteners designed for applications where space constraints require reduced height solutions. These nuts typically have 50-60% of the height of standard nuts while maintaining full thread engagement and locking capability. Our Brass Thin Nuts are machined from solid Brass bar stock and feature chamfered edges for easy installation. They are commonly used in electronic enclosures, panel mounting, and precision equipment where clearance is limited.

Nickel Plated Brass Lock Nuts

Nickel Plated Brass Lock Nuts  and Brass Back Nuts combine the mechanical properties of Brass with enhanced surface protection through electroplated nickel coating. The nickel plating provides additional corrosion resistance, improved wear characteristics, and enhanced aesthetic appearance. These lock nuts undergo multi-stage electroplating process including degreasing, acid cleaning, strike nickel, and bright nickel layers totaling 8-15 microns thickness. They are ideal for marine applications, outdoor installations, and environments with high humidity or chemical exposure.

Brass Half Nuts

Brass Half Nuts are specialized low-profile fasteners with approximately half the height of standard nuts, designed for space-restricted applications. These nuts maintain full thread engagement while providing significant space savings in assembly design. Our Brass Half Nuts are precision-machined to ensure proper thread fit and are available with various locking mechanisms including nylon inserts and deformed threads. They are extensively used in electronic assemblies, instrument panels, and compact mechanical devices.

Brass Check Nuts

Brass Check Nuts, also known as jam nuts or lock nuts, are thin-profile nuts used in conjunction with standard nuts to create a locking assembly. These nuts are typically 60-70% of standard nut height and are tightened against the primary nut to prevent loosening. Our Brass Check Nuts feature precision-cut threads and chamfered bearing surfaces for optimal performance. They are commonly used in rod end assemblies, turnbuckles, and adjustable mechanical linkages where position locking is required.

Brass Cable Gland Lock Nuts

Brass Cable Gland Lock Nuts are specialized fasteners designed for securing cable glands and conduit fittings in electrical installations. These nuts feature coarse threading (typically PG, M, or NPT threads) and provide secure mounting for cable entry systems. Our Brass Cable Gland Lock Nuts are manufactured to IP68 sealing standards and offer excellent EMI/RFI shielding properties. They are widely used in industrial control panels, junction boxes, and hazardous area electrical installations.

Brass Lock Nuts for Conduit Fittings

Brass Lock Nuts for Conduit Fittings are engineered specifically for electrical conduit systems and provide secure mounting of conduit connectors, adapters, and junction fittings. These nuts feature robust construction with thick wall sections and coarse threading compatible with EMT, IMC, and rigid conduit systems. Our conduit lock nuts comply with UL 514B standards and provide reliable grounding continuity in electrical installations. They offer superior corrosion resistance and mechanical strength for industrial and commercial electrical applications.

Standard Size Chart – Brass Lock Nuts (Metric Threading)

Thread SizeAcross Flats (mm)Height (mm)Hex Thickness Thin (mm)Thread PitchMaterial GradeStandard
M35.52.41.20.5CZ121DIN 985
M473.21.60.7CZ121DIN 985
M584.02.00.8CZ121DIN 985
M6105.02.51.0CZ107DIN 985
M8136.53.21.25CZ107DIN 985
M10178.04.01.5CZ107DIN 985
M121910.05.01.75CZ108DIN 985
M162413.06.52.0CZ108DIN 985
M203016.08.02.5CZ108DIN 985
M243619.09.53.0CZ114DIN 985

Imperial Size Chart – Brass Lock Nuts (Inch Threading)

Thread Size (Inches)Across Flats (inches)Height (inches)Hex Thickness Thin (inches)Thread Pitch (TPI)Material GradeStandard
#4-400.250.0940.04740CZ121ASME B18.2.2
#6-320.3130.1250.06332CZ121ASME B18.2.2
#8-320.3750.1560.07832CZ121ASME B18.2.2
#10-240.4380.1880.09424CZ107ASME B18.2.2
1/4″-200.4380.2200.11020CZ107ASME B18.2.2
5/16″-180.5000.2730.13718CZ107ASME B18.2.2
3/8″-160.5630.3200.16016CZ108ASME B18.2.2
7/16″-140.6880.3830.19214CZ108ASME B18.2.2
1/2″-130.7500.4480.22413CZ108ASME B18.2.2
5/8″-110.9380.5750.28811CZ114ASME B18.2.2
3/4″-101.1250.7000.35010CZ114ASME B18.2.2
7/8″-91.3130.8380.4199CZ114ASME B18.2.2
1″-81.5000.9750.4888CZ114ASME B18.2.2

 

Material Grades & International Standards

GradeInternational StandardCompositionTensile Strength (MPa)Applications
CZ121 (CuZn39Pb3)BS EN 12164, ASTM B16Cu 58%, Zn 39%, Pb 3%370-450General purpose
CZ107 (CuZn36)DIN EN 12163, JIS H3250Cu 64%, Zn 36%300-380Marine applications
CZ108 (CuZn37)IS 319, GB/T 4423Cu 63%, Zn 37%320-400Industrial fittings
CZ114 (CuZn40)ASTM B36, DIN 1709Cu 60%, Zn 40%380-460High strength applications
HPb59-1GB/T 4423 (China)Cu 59%, Zn 40%, Pb 1%360-440Machining applications
C36000ASTM B16 (USA)Cu 62%, Zn 35.5%, Pb 2.5%340-410Free cutting brass

Manufacturing Process & Quality Control

Our Brass Lock Nuts and Brass Locking Nuts are manufactured using advanced precision machining processes that ensure consistent quality and dimensional accuracy. The manufacturing process begins with incoming raw material inspection where we verify the chemical composition and mechanical properties of Brass alloys using spectrometric analysis and tensile testing equipment.

The primary manufacturing process involves CNC turning and milling operations using state-of-the-art machinery including Haas CNC lathes, Mazak machining centers, and specialized thread cutting machines. For high-volume production, we utilize multi-spindle automatic lathes and progressive die stamping operations. The thread cutting process employs precision ground thread cutting tools and thread rolling techniques to achieve superior thread quality and surface finish.

Secondary operations include heat treatment for stress relief, surface finishing processes such as tumbling and polishing, and specialized treatments like nickel plating for enhanced corrosion resistance. Our quality control department employs coordinate measuring machines (CMM), thread pitch gauges, hardness testers, and automated optical inspection systems to ensure every Brass Lock Nut meets specified tolerances and performance requirements.

Manufacturing Machinery & Equipment

Machine TypeBrand/ModelCapabilityProduction RateApplications
CNC Turning CentersHaas ST-30, Mazak Quick TurnØ3-50mm500-2000 pcs/hourPrecision machining
Multi-spindle AutomatsCitizen K16VIII, Star SR-38Ø3-38mm1000-5000 pcs/hourHigh volume production
Thread Rolling MachinesProfiroll R12, OSG TR-42M3-M42800-3000 pcs/hourThread forming
Progressive Die PressesAida NC1-200, Komatsu H2F100-2000 tons2000-10000 pcs/hourBlanking & forming
Heat Treatment FurnacesIpsen Atmosphere, Aichelin500-900°CBatch processingStress relief
Electroplating LinesCustom built systemsVarious finishesContinuous processSurface treatment

Typical Parts Produced

Our comprehensive manufacturing capabilities enable us to produce a wide range of Brass Lock Nuts and related fastening components. Standard production items include hex lock nuts from M3 to M100 sizes, specialty nuts for cable glands and conduit fittings, automotive lock nuts for suspension and steering systems, and marine grade lock nuts for boat hardware and rigging applications.

We also manufacture custom Brass Locking Nuts according to customer specifications including modified thread pitches, special hexagon sizes, integrated flanges, and combination lock nut assemblies. Our expertise extends to producing precision lock nuts for medical devices, aerospace components, and electronic equipment where tight tolerances and reliable performance are critical requirements.

Surface Finishes & Treatments

Finish TypeDescriptionThicknessCorrosion ResistanceApplications
Natural BrassAs-machined surfaceStandardIndoor applications
Nickel PlatedBright nickel electroplate8-15 μmExcellentMarine, outdoor use
Chrome PlatedDecorative chrome over nickel0.5-2 μmSuperiorAutomotive, architectural
PassivatedChemical passivation0.1-0.5 μmGoodElectronic assemblies
Antique BrassOxidized surface treatment1-3 μmStandardDecorative applications
Clear LacquerProtective organic coating5-10 μmGoodPrevents tarnishing

Industries & Applications

Automotive Industry: Our Brass Lock Nuts are extensively used in automotive applications including engine components, transmission assemblies, brake systems, and suspension components. The excellent corrosion resistance and thermal stability of Brass make these fasteners ideal for under-hood applications and exhaust systems.

Marine & Naval Applications: The superior corrosion resistance of Brass in saltwater environments makes our lock nuts perfect for marine hardware, boat fittings, rigging assemblies, and underwater equipment. We supply to shipbuilders, marina operators, and marine equipment manufacturers worldwide.

Electrical & Electronics: Brass Cable Gland Lock Nuts and specialized variants are used in electrical panels, junction boxes, control systems, and telecommunications equipment. The excellent electrical conductivity and EMI shielding properties of Brass make these components essential for electrical installations.

Plumbing & HVAC: Our Brass Lock Nuts are used in plumbing fixtures, pipe fittings, valve assemblies, and heating/cooling system components where the combination of strength, corrosion resistance, and machinability is required.

Quality Control Process Flow

Raw MaterialInspectionCNC MachiningOperationsThreadProcessingSurfaceTreatmentFinalInspectionQC1QC2QC3QC4QC5Material verificationChemical analysisDimensional checkSurface qualityThread pitchThread profileCoating thicknessAdhesion testFinal inspectionPackagingFigure 2: Our comprehensive quality control process ensures consistent product quality at every manufacturing stage

Tolerance Standards & Precision

ParameterStandard TolerancePrecision ToleranceMeasurement MethodEquipment Used
Thread Pitch±0.05mm±0.02mmThread pitch gaugeMitutoyo thread gauges
Hex Across Flats±0.1mm±0.05mmCaliper measurementMitutoyo digital calipers
Overall Height±0.15mm±0.08mmHeight gaugeTesa Height-Master
Thread Major Diameter±0.08mm±0.04mmThread micrometerStarrett thread micrometers
Concentricity0.1mm TIR0.05mm TIRDial indicatorBrown & Sharpe CMM
Surface RoughnessRa 1.6μmRa 0.8μmProfilometerMitutoyo SurfTest

Performance Metrics & Testing

Mechanical Testing: All our Brass Lock Nuts undergo comprehensive mechanical testing including tensile strength testing, proof load verification, and torque-tension relationship analysis. We maintain statistical process control (SPC) charts for critical parameters and conduct regular capability studies to ensure consistent performance.

Corrosion Testing: Salt spray testing per ASTM B117 standards is conducted on all surface-treated products. Our Nickel Plated Brass Lock Nuts consistently achieve over 240 hours of salt spray resistance without base material corrosion, exceeding industry requirements for marine and outdoor applications.

Test ParameterTest StandardRequirementsOur PerformanceTest Frequency
Tensile StrengthASTM F606M≥300 MPa350-450 MPaEvery lot
Proof LoadISO 898-285% of tensile90-95%Sample basis
Salt Spray ResistanceASTM B117≥72 hours240+ hoursMonthly
Torque PerformanceDIN 267-28Specified rangeWithin ±10%Process control
Dimensional AccuracyISO 4759-1Grade AGrade A compliance100% inspection

Turnaround Time & Production Capacity

Our standard turnaround time for Brass Lock Nuts is 4-6 weeks for regular orders, with expedited delivery available in 2-3 weeks for urgent requirements. We maintain strategic inventory of popular sizes and can offer same-day shipment for standard items from our stock. For custom and large-volume orders, our production planning team works closely with customers to establish mutually acceptable delivery schedules.

Our manufacturing facilities operate with multiple shift patterns and have the flexibility to scale production based on order requirements. Current production capacity exceeds 2 million pieces per month across all product categories, with capability to increase output through additional equipment and workforce deployment when needed.

Frequently Asked Questions (FAQ)

Q1: What is the difference between Brass Lock Nuts and regular hex nuts?
A: Brass Lock Nuts incorporate specific locking mechanisms such as deformed threads, nylon inserts, or prevailing torque features that prevent loosening due to vibration or thermal cycling, while regular hex nuts rely solely on friction and may loosen under dynamic loads.

Q2: Which Brass alloy grade is best for marine applications?
A: CZ107 (CuZn36) and CZ108 (CuZn37) grades offer excellent corrosion resistance in marine environments. For critical marine applications, we recommend Nickel Plated Brass Lock Nuts for enhanced protection against saltwater corrosion.

Q3: Can you manufacture Brass Lock Nuts according to custom specifications?
A: Yes, we specialize in custom manufacturing and can produce lock nuts according to customer drawings, specifications, or modified standard designs. Our engineering team provides technical support for custom applications.

Q4: What are the temperature limitations for Brass Lock Nuts?
A: Brass Lock Nuts can operate continuously at temperatures up to 200°C (392°F) without significant degradation of mechanical properties. For higher temperature applications, we recommend consulting our technical team for specific alloy recommendations.

Q5: Do you provide material certificates and test reports?
A: Yes, we provide comprehensive material certificates including chemical composition analysis, mechanical property test reports, and dimensional inspection certificates for all orders. Traceability documentation is maintained for each production lot.

Q6: What is the minimum order quantity for standard sizes?
A: Our minimum order quantity varies by size and specification, typically ranging from 100-1000 pieces for standard items. For stock items, we can accommodate smaller quantities. Custom orders have higher minimum quantities depending on complexity.

Q7: How do you ensure consistent thread quality?
A: We use precision thread cutting tools, CNC thread milling, and thread rolling processes with regular tool inspection and replacement. Thread gauges and automated inspection systems verify thread pitch, profile, and dimensional accuracy throughout production.

Q8: Can Brass Lock Nuts be used in potable water applications?
A: Yes, our lead-free Brass grades (CZ107, CZ108) comply with potable water standards including NSF/ANSI 61 and are suitable for plumbing and drinking water applications. Material certificates confirming lead content below 0.25% are provided.

Q9: What surface treatments are available for enhanced corrosion resistance?
A: We offer nickel plating, chrome plating, passivation, and clear lacquer coatings. Nickel plating is most common for corrosive environments, providing excellent protection with 8-15 micron thickness and 240+ hours salt spray resistance.

Q10: Do you provide technical support for application engineering?
A: Our technical team provides comprehensive application support including material selection, torque specifications, installation recommendations, and failure analysis. We work closely with customers to ensure optimal fastener performance in their specific applications.

Q11: What quality standards and certifications do you maintain?
A: We maintain ISO 9001:2015 quality management certification and comply with various international standards including ASTM, DIN, BS, JIS, and IS specifications. Our quality system includes statistical process control and continuous improvement programs.

Q12: Can you supply Brass Lock Nuts with customer-specific packaging and labeling?
A: Yes, we offer customized packaging solutions including customer logos, part numbering systems, and specific packaging formats such as bulk bins, individual poly bags, or custom boxes according to customer requirements and branding needs.

Why Choose Our Brass Lock Nuts

Three Decades of Global Experience: With over 30 years of manufacturing expertise and global exposure, we understand diverse market requirements and international quality standards. Our experience spans across continents, serving customers in USA, Europe, Asia, and emerging markets with consistently superior products.

Fastest Turnaround Times: Our streamlined production processes and strategic inventory management enable us to offer industry-leading delivery schedules. Standard orders are completed in 4-6 weeks, with emergency delivery options available for critical applications.

Superior Customer Support: Our dedicated customer service team provides comprehensive technical support, application guidance, and responsive communication throughout the order lifecycle. We maintain direct communication channels and provide regular order updates to ensure customer satisfaction.

Advanced Communication Systems: We utilize modern communication technologies including real-time order tracking systems, digital documentation, and multi-channel communication platforms to ensure seamless interaction with our global customer base.

Unmatched Customization Capabilities: Our engineering and manufacturing teams excel at creating custom solutions tailored to specific application requirements. From modified dimensions to special materials and unique surface treatments, we deliver exactly what our customers need.

Flexible Production Scheduling: We understand that business requirements change, and our production planning system accommodates schedule adjustments, priority orders, and varying quantity requirements with minimal impact on delivery commitments.

Comprehensive Quality Assurance: Every product undergoes rigorous multi-stage quality control with documented traceability. Our quality system ensures consistent performance and reliability that customers have trusted for decades.

Packaging & Shipping Solutions

Our packaging solutions are designed to ensure product protection during international shipping while optimizing logistics costs. Standard packaging includes moisture-resistant poly bags, corrugated cartons with foam inserts, and wooden export crates for large orders. We provide customized packaging with customer logos, part numbers, and specific labeling requirements.

For international shipping, we work with leading freight forwarders and shipping lines to provide competitive rates and reliable delivery. Our export documentation team handles all customs paperwork, certificates of origin, and compliance documentation required for smooth customs clearance. We offer various shipping options including air freight for urgent orders, sea freight for economical bulk shipments, and door-to-door delivery services.

Package TypeQuantity RangeProtection LevelShipping MethodCustom Options
Poly bags100-5000 pcsBasicCourier/AirCustomer labeling
Carton boxes1000-25000 pcsStandardAir/Sea freightLogo printing
Wooden crates10000+ pcsMaximumSea freightCustom dimensions
Bulk containers50000+ pcsIndustrialContainer shippingReturnable packaging

Customer Testimonial

“We have been sourcing Brass Lock Nuts from this Indian manufacturer for over 8 years, and their consistency in quality and delivery has been outstanding. Their technical team helped us solve a critical application challenge with custom-designed lock nuts that eliminated field failures in our marine equipment. The communication is always prompt and professional, and their pricing remains competitive despite increasing material costs. I highly recommend them for anyone looking for reliable brass fastener solutions.”

– R Martinez, Senior Procurement Manager, Mexico

Material Properties Reference

PropertyCZ121CZ107CZ108CZ114Test Method
Density (g/cm³)8.4-8.78.4-8.68.4-8.68.5-8.7ASTM B311
Tensile Strength (MPa)370-450300-380320-400380-460ASTM E8
Yield Strength (MPa)140-200120-180130-190150-210ASTM E8
Elongation (%)15-2520-3518-3012-20ASTM E8
Hardness (HB)65-8555-7560-8070-90ASTM E10
Electrical Conductivity (%IACS)26-2828-3227-3125-28ASTM B193

Glossary of Technical Terms

Lock Nut: A specialized fastener designed to resist loosening through vibration or torque by incorporating mechanical or chemical locking mechanisms.

Prevailing Torque: The torque required to advance a threaded fastener when the threads are not loaded in tension, indicating the locking effectiveness of the fastener.

Thread Pitch: The distance between adjacent thread crests, measured parallel to the thread axis, determining the mechanical advantage and holding power of threaded connections.

Proof Load: The maximum load that a fastener can withstand without permanent deformation, typically 85-90% of the ultimate tensile strength.

Across Flats: The distance measured across the parallel flat surfaces of a hexagonal nut, determining the required wrench or socket size for installation.

Thread Engagement: The length of thread contact between male and female threaded components, critical for joint strength and reliability.

Deformed Thread: Intentionally distorted thread profile that creates interference and resistance to rotation, providing locking action in threaded assemblies.

Salt Spray Resistance: The ability of a material or coating to resist corrosion when exposed to salt-laden atmosphere, measured in hours per ASTM B117 standard.

Related parts

Primary : Brass Lock Nuts, Brass Locking Nuts, Brass Metric Lock Nuts, Brass UNEF Lock Nuts, Brass Thin Nuts, Nickel Plated Brass Lock Nuts, Brass Half Nuts, Brass Check Nuts, Brass Cable Gland Lock Nuts, Brass Back Nuts

Related : Brass Hex Lock Nuts, Brass Nylon Insert Lock Nuts, Brass Prevailing Torque Nuts, Brass Jam Nuts, Brass Coupling Nuts, Brass Wing Nuts, Brass Cap Nuts, Brass Castle Nuts, Brass T-Nuts, Brass Weld Nuts

Brass Fasteners, Brass Hardware, Threaded Brass Components, Brass Electrical Fittings, Brass Marine Hardware, Brass Plumbing Fittings, Brass Automotive Parts, Precision Brass Components

Manufacturing Terms: CNC Machined Brass Nuts, Forged Brass Lock Nuts, Stamped Brass Components, Cold Formed Brass Parts, Hot Forged Brass Fasteners, Precision Turned Brass Nuts

International terms: DIN Brass Lock Nuts, ASTM Brass Fasteners, JIS Brass Components, IS Standard Brass Nuts, BS Brass Hardware, Metric Brass Lock Nuts, Imperial Brass Lock Nuts

 

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