Custom Precision Brass CNC Machining Services
One-stop CNC brass machining for C36000, C26000 & lead-free alloys, RoHS compliant for electronics, plumbing and marine precision components.
ISO 14001:2015 ISO 9001:2015 IATF 16949:2016
Brass Production Overview
SinoCMI is a professional brass precision component manufacturer serving global industrial buyers worldwide. We process mainstream industrial brass alloy grades with full in-house precision machining workflows, supporting rapid prototype trial to large-volume mass production across electronics, automotive, plumbing, marine and instrumentation sectors. All custom brass parts comply with ISO 9001:2025 and AS9100D quality specifications with strict micron-level dimensional tolerance control.
The precision and durability of your brass components have significantly improved our assembly line efficiency. We consistently rely on them for their exceptional quality and flawless performance.
Five Mainstream Brass Alloy Grades for Precision Custom Machining
We select brass alloys based on copper-zinc proportion, lead content, corrosion resistance and machinability to match different working conditions; five core machining-grade brass families as below:
C36000 Free-Cutting Brass（HPb59-1 ）
Industry-standard free-machining brass with 2.5%~3% lead additive, 100% machinability rating, short broken chips to reduce tool wear, ideal for high-volume threaded fittings, fasteners, valve inserts and small precision turned parts. Not recommended for welding or long-term seawater service.
C26000 Cartridge Brass（70/30 ）
70%Cu+30%Zn non-leaded brass with superior ductility and cold forming performance, excellent stress corrosion resistance, widely used for electronic terminals, connector pins, instrument shell and stamped precision components.
C46400 Naval Brass
Special marine-grade brass with tin additive for outstanding chloride & seawater corrosion resistance, applied to marine pump fittings, offshore valve bodies and ship pipeline accessories, lower machinability vs C36000.
C23000 Red Brass (85Cu-15Zn)
High copper-content red brass with excellent rust resistance and non-sparking property, perfect for heat exchanger tubes, sanitary plumbing fittings and corrosive environment mechanical housings.
Lead-Free Eco Brass(C48500)
RoHS/REACH compliant lead-free alternative for food contact, drinking water fittings and medical miniature components, designed to meet global environmental regulations though slightly poorer machinability than leaded C36000.
Core Advantages of Precision Machined Brass Components
Brass is a top-choice copper alloy for precision manufacturing thanks to integrated physical and chemical merits:
- Outstanding machinability: C36000 ranks 100% machinability benchmark, cutting cycle reduces 30%~40% vs steel/aluminum, lowers production cost and tool consumption;
- Excellent thermal & electrical conductivity: Ideal raw material for electronic conductive parts, heat sink and wiring terminal components;
- Good corrosion & anti-tarnish property: Natural oxidation resistance under normal atmosphere, customizable surface treatment to further enhance anti-rust lifespan;
- Superior polish & decorative performance: Easy to achieve mirror finish after polishing for luxury hardware, lighting and architectural decorative parts;
- Cost-effective & recyclable: Lower raw cost than stainless steel and copper, 100% recyclable to support clients’ sustainable production targets.
Brass Parts Application Industries
- Electronics: C36000/C26000 brass for connectors and electronic hardware
- Plumbing: Lead-free C23000 brass for food-grade sanitary fittings
- Automotive & Pneumatics: C36000 brass for valves, bushings and fittings
- Marine: Corrosion-resistant C46400 naval brass for offshore equipment
- Instrumentation: C26000/C36000 brass for precision and decorative parts
In-house Machining & Finishing for Brass Parts
All brass manufacturing and finishing are completed in-house with no outsourcing.
Precision Machining
- Multi-axis CNC turning & milling for complex, tight-tolerance brass parts
- Precision grinding & honing (Ra0.4μm) for high-performance valves and bushings
- Micro-machining for miniature electronic and medical components
- Laser cutting & welding for burr-free thin-wall brass structures
- Mechanical & electropolishing for mirror-smooth sealing and decorative surfaces
- Nickel, tin and gold electroplating for enhanced durability and electrical performance
- Passivation & clear coating to resist tarnish while preserving brass’s metallic look
One-stop Manufacturing & Quality Control of Brass Parts
We deliver full-cycle services from raw materials to finished goods to cut lead times.
One-Stop Service
- In-stock mainstream brass grades for fast material supply
- Seamless transition from prototyping to high-volume production
- In-house heat treatment, laser marking and assembly to reduce costs
- Critical tolerance: ±0.005 mm
- Inspected by Zeiss CMM, Keyence scanners and optical comparators
- Complete batch traceability with full test documents
- ISO 9001:2025 and AS9100D certified
Engineering & Design Collaboration of Brass
- Proactive DFM (Design for Manufacturability) feedback to optimize brass part geometry for cost and performance.
- Tolerance analysis and GD&T (Geometric Dimensioning and Tolerancing) consultation.
- Rapid turnaround on functional prototypes using live tooling and direct material equivalents.
- Value-added suggestions on wall thickness, radii, and undercuts to prevent stress cracking.
- Seamless file handling: accepts STEP, IGES, SolidWorks, and all major CAD formats.
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Quality & Compliance Standards of Brass
Our brass parts meet strict quality and compliance standards (ISO 9001, IATF 16949, RoHS, REACH, ASTM B16/B453), with full inspection reports and material certificates included per shipment.
- Certified standards – Compliant with ISO 9001, IATF 16949 (automotive), RoHS, REACH, and ASTM B16/B453.
- Full inspection documentation – Every shipment includes CMM, optical comparator, and surface roughness test reports.
- Material certificates – Provided with each delivery for full traceability.
- Lead-free option – Available for potable water systems, meeting NSF/ANSI 61.
- Precision quality control – All parts undergo dimensional and surface finish verification using advanced metrology equipment.
FAQs About Brass
What is brass and why is it commonly used in precision parts?
expand_less expand_moreA: Brass is an alloy of copper and zinc, known for its excellent machinability, corrosion resistance, and electrical conductivity. These properties make it ideal for precision parts in industries like automotive, plumbing, electronics, and aerospace, where durability and precision are critical.
What types of brass alloys do you offer for precision manufacturing?
expand_less expand_moreA: We work with a range of brass alloys, including C260 (Cartridge Brass), C360 (Free-Cutting Brass), and C464 (Naval Brass). Each alloy has specific characteristics—such as enhanced strength or corrosion resistance—allowing us to recommend the best material for your application.
How does brass compare to other metals like stainless steel or aluminum in precision parts?
expand_less expand_moreA: Brass offers superior machinability, often allowing for faster production and longer tool life compared to stainless steel or aluminum. It also provides natural antimicrobial properties and good conductivity. While not as strong as steel, brass is more corrosion-resistant than many alternatives, making it suitable for specific environments.
Can you produce custom brass parts with tight tolerances?
expand_less expand_moreA: Yes. Our advanced CNC machining and stamping capabilities enable us to manufacture custom brass parts with tolerances as tight as ±0.001 inches (±0.025 mm). We ensure high precision and consistency for complex geometries and demanding specifications.
What quality control measures do you have for brass parts?
expand_less expand_moreA: We implement strict QC protocols, including material certification, in-process inspections, dimensional checks with CMM, and final audits. Our processes comply with ISO 9001 standards to guarantee that every brass part meets your specifications and industry requirements.
What are the lead times for brass part production?
expand_less expand_moreA: Lead times vary based on part complexity and order volume. Typically, prototyping takes 1–2 weeks, while production runs range from 3–6 weeks. We offer expedited services when needed and maintain transparent communication throughout the process.
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