Brass Knurled Inserts – Premium Quality Manufacturing of Brass inserts

Price: US$ 10.40/kilogram

We are one of the leading manufacturers and exporters of brass knurled inserts from India. We have been supplying precision engineered brass knurled inserts to the world market for many decades. Our comprehensive range of brass knurled inserts encompasses metric knurled inserts, plastic molding inserts, ultrasonic molding inserts, diamond knurled inserts, and threaded knurled inserts designed for diverse industrial applications. With state-of-the-art CNC machining capabilities and adherence to international quality standards including ASTM, DIN, JIS, and BS specifications, we deliver superior brass components that meet the demanding requirements of automotive, electronics, telecommunications, and precision engineering industries. Our brass knurled inserts are manufactured using high-grade brass alloys ensuring excellent corrosion resistance, superior thread engagement, and optimal performance in both thermoplastic and thermoset molding applications. The precision knurled surface provides exceptional grip and retention characteristics while maintaining dimensional accuracy within tight tolerances of ±0.05mm to ±0.1mm depending on the application requirements.

Overview of Brass Knurled Inserts

Brass knurled inserts represent a critical fastening solution in modern manufacturing, offering superior mechanical properties and versatility across multiple industrial sectors. These precision-engineered components feature a distinctive knurled external surface that provides exceptional retention characteristics when installed in plastic, composite, or soft metal substrates. The knurled pattern, typically diamond or straight configuration, creates multiple anchor points that distribute stress evenly and prevent rotation or pull-out under dynamic loading conditions. Manufacturing these components requires specialized machinery including multi-spindle CNC lathes, knurling machines, and precision threading equipment to achieve the required surface finish and dimensional accuracy.

Types of Brass Knurled Inserts

Brass Knurled Inserts (Standard)

Standard brass knurled inserts feature a conventional straight or diamond knurled external surface with internal threading conforming to ISO metric or unified thread standards. These inserts are manufactured from high-quality brass alloys including CDA 360 (free-cutting brass), CDA 361 (free-cutting brass with lead), and CDA 377 (forging brass) depending on the specific application requirements. The knurled surface typically features a pitch of 0.5mm to 1.5mm with knurl height ranging from 0.1mm to 0.3mm to ensure optimal grip without compromising the integrity of the host material. Installation methods include press-fitting, heat insertion, and ultrasonic welding depending on the substrate material and application requirements. These standard inserts are widely used in consumer electronics, automotive trim components, and general industrial assemblies where reliable threaded fastening is required in plastic or composite materials.

Brass Metric Knurled Inserts

Brass metric knurled inserts are specifically designed to accommodate metric threading systems prevalent in European and international manufacturing standards. These inserts feature internal threads conforming to ISO 262 specifications with pitch ranges from M2 x 0.4 to M20 x 2.5, manufactured to DIN 7965 and ISO 8140 standards for dimensional accuracy and thread quality. The external knurled surface follows DIN 82 specifications for knurling patterns, ensuring consistent performance across different manufacturing environments. Material selection typically includes CDA 360 brass for standard applications and CDA 377 for applications requiring enhanced mechanical properties. Heat treatment processes may include stress relief annealing at 200-250°C to eliminate residual stresses from the knurling operation. Quality control measures include go/no-go thread gauging, dimensional verification using coordinate measuring machines (CMM), and surface finish analysis to ensure compliance with Ra 1.6 to Ra 3.2 surface roughness specifications.

Brass Knurled Plastic Molding Inserts

Brass knurled plastic molding inserts are engineered specifically for injection molding and insert molding applications where the insert becomes an integral part of the molded plastic component. These specialized inserts feature optimized knurl geometry designed to provide maximum retention without creating stress concentrations that could lead to cracking in thermoplastic materials. The knurl pattern is typically a 30-degree diamond configuration with reduced knurl height (0.05mm to 0.15mm) to accommodate the thermal expansion characteristics of various plastic resins including ABS, polycarbonate, nylon, and POM. Temperature resistance specifications allow for molding temperatures up to 300°C without dimensional degradation or surface oxidation. Special attention is given to the chamfer angles and lead-in geometry to facilitate automated insertion during the molding process. Surface treatments may include passivation or chromate conversion coating to enhance corrosion resistance in humid environments or when used with hygroscopic plastic materials.

Brass Ultrasonic Molding Inserts

Brass ultrasonic molding inserts are precision-engineered for ultrasonic insertion into thermoplastic substrates, utilizing high-frequency vibrations (typically 20-40 kHz) to generate localized heating that softens the plastic material allowing for rapid and secure installation. The external geometry features a specially designed taper angle (typically 45-60 degrees) at the insertion end to facilitate material displacement and optimal energy transmission during the ultrasonic welding process. Knurl specifications are optimized for ultrasonic applications with precise depth control (±0.02mm) and consistent spacing to ensure uniform energy distribution and prevent over-melting of the substrate material. Material selection emphasizes thermal conductivity and acoustic properties, with CDA 360 brass being preferred for its excellent machinability and thermal response characteristics. Quality control includes ultrasonic bond strength testing using pull-out and torque resistance measurements, typically achieving retention values of 150-300 N depending on the substrate material and insert geometry. Installation parameters are carefully controlled including amplitude settings (10-50 microns), welding time (0.5-3.0 seconds), and pressure application (5-50 bar) to ensure consistent results across production volumes.

Brass Diamond Knurled Inserts

Brass diamond knurled inserts feature a distinctive diamond-pattern knurled surface that provides superior retention characteristics compared to straight knurled alternatives. The diamond pattern, typically oriented at 30-degree angles to the insert axis, creates a multi-directional grip that resists both axial and rotational forces. Manufacturing requires specialized diamond knurling tools with precise tooth geometry and proper tool maintenance to ensure consistent pattern reproduction across production lots. The diamond pattern depth is carefully controlled to optimize retention while minimizing stress concentration in the host material, typically ranging from 0.08mm to 0.25mm depending on the insert diameter and application requirements. Material specifications include high-tensile brass alloys such as CDA 377 (silicon brass) for applications requiring enhanced strength properties. Surface finish quality is critical with diamond pattern uniformity measured using optical profilometry to ensure consistent texture depth and spacing. These inserts excel in applications requiring high pull-out resistance such as automotive suspension components, aerospace fasteners, and heavy-duty industrial equipment where operational vibration and dynamic loading are prevalent.

Brass Threaded Knurled Inserts

Brass threaded knurled inserts combine external knurled retention features with precision internal threading to provide robust fastening solutions for demanding applications. The internal threading is manufactured to Class 2B tolerance specifications for metric threads and Class 2 for unified threads, ensuring compatibility with standard bolts and screws while maintaining optimal engagement characteristics. Thread quality includes proper thread form verification using optical comparators and thread plug gauges to confirm pitch diameter, major diameter, and thread angle compliance with applicable standards. The knurled external surface is integrated with the threaded geometry through careful design coordination to ensure wall thickness adequacy and prevent thread distortion during the knurling operation. Advanced manufacturing techniques include thread rolling before knurling to work-harden the thread form and improve fatigue resistance. Material selection emphasizes both machinability for the threading operation and durability for the knurling process, with CDA 360 brass providing the optimal balance of properties. Quality assurance includes thread strength testing, knurl retention evaluation, and dimensional verification using precision measuring equipment including thread micrometers, pin gauges, and coordinate measuring machines.

Size Charts

Metric Size Chart

UNC (Unified National Coarse) Size Chart

Material Grades and Specifications

International Material Standards

Manufacturing Processes and Machinery

Our manufacturing facility employs advanced CNC machining centers including multi-axis Swiss-type lathes, precision boring machines, and automated knurling equipment to produce brass knurled inserts with exceptional accuracy and surface finish quality. The primary manufacturing sequence begins with brass bar stock preparation, followed by CNC turning operations on Citizen Cincom K16 and Star SR-20R Swiss lathes capable of maintaining tolerances within ±0.01mm. Knurling operations utilize specialized knurling heads including Accu-Trak and Dorian knurling systems with carbide knurling wheels to achieve consistent surface texture and dimensional stability.

Threading operations are performed using precision tap holders and thread mills on Haas ST-15Y and Mazak Quick Turn machines equipped with through-coolant capabilities for optimal thread quality and tool life. Secondary operations include deburring using vibratory finishing equipment, cleaning in ultrasonic baths with alkaline solutions, and dimensional inspection using Mitutoyo coordinate measuring machines and optical comparators. Heat treatment processes when required are conducted in controlled atmosphere furnaces maintaining precise temperature profiles for stress relief and property enhancement.

Typical Parts Produced

Our production capabilities encompass a diverse range of brass knurled insert configurations including standard cylindrical inserts, flanged inserts, tapered inserts, and custom geometries designed for specific customer applications. Common production items include automotive dashboard inserts ranging from M3 to M8 threads, electronics housing inserts for consumer devices, telecommunications equipment fasteners, aerospace panel inserts conforming to AS9100 quality standards, and medical device components requiring biocompatible surface treatments. Specialty products include captive thumb screws, adjustable leveling feet, plastic enclosure inserts, and precision instrumentation hardware.

Technical Specifications and Dimensional Data

Plating and Surface Finishes

Surface treatment options for brass knurled inserts include natural brass finish with anti-tarnish coating, nickel plating (bright or satin), chromium plating for enhanced corrosion resistance, zinc plating with chromate conversion coating, and specialized coatings such as PTFE for low-friction applications. Electroplating processes are conducted in accordance with ASTM B456 for nickel plating and ASTM B177 for chromium plating, maintaining thickness specifications of 5-25 microns depending on the application requirements. Quality control includes adhesion testing per ASTM B571, corrosion resistance evaluation using salt spray testing per ASTM B117, and thickness verification using X-ray fluorescence analyzers.

Industries and Applications

Brass knurled inserts serve critical fastening functions across diverse industrial sectors including automotive manufacturing (dashboard assemblies, trim components, electrical housings), electronics and telecommunications (device enclosures, connector assemblies, circuit board mounting), aerospace and defense (avionics panels, control systems, structural assemblies), medical devices (diagnostic equipment, surgical instruments, therapeutic devices), and consumer appliances (control panels, adjustment mechanisms, mounting hardware). The corrosion resistance and electrical conductivity of brass make these inserts particularly suitable for marine applications, electronic grounding systems, and environments requiring EMI shielding capabilities.

International Standards Compliance

Performance Metrics and Testing

Quality Testing and Assurance

Dimensional Testing: All brass knurled inserts undergo comprehensive dimensional verification using calibrated measuring equipment including coordinate measuring machines (CMM), optical comparators, and precision gauges. Thread quality is verified using GO/NO-GO thread gauges, thread micrometers, and optical thread analyzers to ensure compliance with specified tolerances and standards. Knurl pattern consistency is evaluated using surface profilometers and optical inspection systems to maintain uniform texture depth and spacing across production batches.

Physical and Chemical Testing: Material composition verification is conducted using X-ray fluorescence (XRF) spectroscopy to confirm brass alloy content and detect trace elements. Mechanical property testing includes tensile strength evaluation, hardness testing using Rockwell and Vickers methods, and elongation measurements per ASTM standards. Corrosion resistance testing employs salt spray chambers, humidity exposure, and electrochemical analysis to validate performance in demanding environments. Surface finish quality is assessed using atomic force microscopy and scanning electron microscopy for detailed texture analysis.

Tolerances and Quality Standards

Manufacturing tolerances for brass knurled inserts are maintained according to ISO 2768 general tolerance specifications with tighter control limits applied to critical dimensions. Thread tolerances conform to ISO 965 for metric threads and ASME B1.1 for unified threads, typically achieving Class 6H for internal threads and Class 6g for external threads. Knurl specifications maintain depth variations within ±0.01mm and pattern spacing accuracy of ±0.02mm. Concentricity tolerances are controlled to 0.05mm total indicator reading (TIR) for critical applications, with roundness tolerances maintained within 0.02mm for optimal performance in automatic assembly equipment.

Turnaround Time and Production Capacity

Standard lead time for brass knurled inserts is 4-6 weeks from order confirmation, depending on quantity and complexity. Rush orders can be accommodated with expedited processing in 2-3 weeks with appropriate scheduling coordination. Our production capacity includes multiple CNC machining centers operating in three shifts, enabling monthly production volumes exceeding 500,000 pieces across various size ranges. Custom tooling development for special configurations typically requires an additional 2-3 weeks for design, manufacturing, and validation before production commencement.

Why Choose Our Brass Knurled Inserts

Packaging and Shipping

Our comprehensive packaging solutions ensure product integrity during international shipping while providing convenient handling for customer receiving operations. Standard packaging includes anti-static bags for electronic applications, corrosion-resistant VCI (Vapor Corrosion Inhibitor) materials for long-term storage, and custom-labeled boxes with part identification and quantity verification. Bulk packaging options include plastic containers, cardboard cartons, and wooden crates depending on quantity and shipping destination requirements. Special packaging accommodations include customer-specific labeling, barcode generation, and packaging quantity specifications tailored to your assembly line requirements. International shipping is handled through established logistics partnerships with DHL, FedEx, and UPS, providing tracking capabilities and delivery confirmation. Export documentation includes commercial invoices, packing lists, certificates of origin, and material test certificates as required by destination country regulations.

Custom Made Products and Engineering Support

Our custom manufacturing capabilities extend beyond standard catalog items to include completely engineered solutions tailored to your specific application requirements. To initiate custom product development, please share detailed technical drawings, quantity requirements, and any special material or performance properties needed for your application. Our engineering team will review your specifications and provide optimized design recommendations along with competitive quotations within 48-72 hours of receiving complete technical information. Custom capabilities include special thread forms, unique knurl patterns, integrated flanges, captive features, and multi-diameter configurations. We also accommodate special material requirements including lead-free brass alloys, antimicrobial copper alloys, and high-strength bronze compositions. Prototype development services are available with rapid turnaround times of 5-10 days for initial samples, allowing for design validation before full production commitment. Our promise is to deliver the best possible quotations for customized brass knurled inserts with speedy delivery schedules that meet your project timelines.

Frequently Asked Questions

Q1: What thread standards do your brass knurled inserts accommodate?
A: Our brass knurled inserts are available in ISO metric threads (M2-M20), unified threads (UNC/UNF #4-3/8″), and custom thread specifications including BSP, NPT, and proprietary forms as required by customer applications.

Q2: Can you provide brass knurled inserts with lead-free composition?
A: Yes, we manufacture lead-free brass inserts using CDA 360 with bismuth additives or CDA 377 silicon brass alloys that comply with RoHS directives and California Proposition 65 requirements for consumer applications.

Q3: What is the minimum order quantity for custom brass knurled inserts?
A: Minimum order quantities vary based on complexity, but typically start at 1,000 pieces for standard modifications and 5,000 pieces for completely custom designs requiring special tooling development.

Q4: Do you provide material certificates and test reports?
A: Comprehensive material test certificates including chemical composition analysis, mechanical property reports, and dimensional inspection reports are provided with each shipment at no additional cost.

Q5: What knurl patterns are available for different applications?
A: We offer straight knurl, diamond knurl (30° and 45° patterns), and custom patterns. Diamond knurl provides superior retention for most applications, while straight knurl is preferred for applications requiring directional grip characteristics.

Q6: Can brass knurled inserts be installed using automated equipment?
A: Yes, our inserts are designed for compatibility with automatic insertion equipment including pneumatic presses, ultrasonic welders, and heat insertion systems. We can provide installation parameter recommendations for your specific equipment.

Q7: What surface treatments are available for corrosion protection?
A: Available treatments include bright nickel plating, satin nickel, chromium plating, zinc plating with chromate conversion, passivation treatments, and organic coatings such as PTFE for specialized applications.

Q8: How do you ensure dimensional consistency across large production runs?
A: Statistical process control (SPC) methods, regular gauge calibration, and in-process monitoring using coordinate measuring machines ensure dimensional consistency. Control charts track critical dimensions throughout production runs.

Q9: Are your brass knurled inserts suitable for high-temperature applications?
A: Standard brass inserts are suitable for continuous operation up to 150°C. For higher temperature applications up to 250°C, we recommend silicon brass alloys or bronze alternatives with enhanced thermal stability.

Q10: Can you accommodate special packaging requirements for JIT delivery?
A: Yes, we provide just-in-time packaging solutions including kanban labeling, specific quantity packaging, and scheduled delivery programs that integrate with your production planning systems.

Q11: What technical support is available for installation troubleshooting?
A: Our technical support team provides installation guidance, troubleshooting assistance, and application engineering support. We can also provide on-site technical consultations for complex installations.

Q12: Do you offer brass knurled inserts for ultrasonic welding applications?
A: Specialized ultrasonic welding inserts feature optimized geometry, controlled taper angles, and material specifications designed for ultrasonic energy transmission and optimal bond strength in thermoplastic materials.

Q13: What quality standards do your manufacturing processes follow?
A: Manufacturing processes comply with ISO 9001:2015 quality management standards, ISO 14001:2015 environmental management, and ISO 45001:2018 occupational health and safety management systems.

Q14: Can you provide brass knurled inserts with integrated flanges or special features?
A: Custom features including integral flanges, captive washers, multiple diameters, and specialized driving features can be incorporated into custom designs based on your application requirements.

Q15: What is your capability for rush orders and expedited delivery?
A: Rush orders can be accommodated with 2-3 week delivery for standard configurations and 3-4 weeks for modified designs, subject to production schedule availability and quantity requirements.

Q16: Do you provide design optimization recommendations for new applications?
A: Our engineering team offers design optimization services including finite element analysis, stress concentration evaluation, and retention strength predictions to optimize insert performance for your specific application.

Q17: Are your brass knurled inserts compatible with recycling requirements?
A: Brass materials are highly recyclable, and we can provide material composition documentation and recycling guidelines to support your environmental compliance and sustainability initiatives.

Material Property Tables

Glossary of Technical Terms

Related Terms