Custom CNC Brass Pipe Fittings Manufacturer | China

Product Overview & Machining Capabilities

Xiamen Dazao Machinery is a direct China supplier and manufacturer of custom CNC brass pipe fittings engineered for high-pressure fluid and gas transfer. We utilize multi-axis CNC Swiss-type turning and precision milling to produce complex brass fittings directly from extruded bar stock.

Our machining process ensures high concentricity, strict thread engagement, and a minimum yield strength suitable for demanding industrial fluid management, HVAC, and plumbing architectures. By controlling the entire manufacturing cycle in our factory, we maintain exact tolerances down to ±0.01mm while optimizing cycle times for high-volume production.

Technical Specifications

DFM Notes for CNC Brass Fittings

To optimize cycle times and reduce per-unit costs for volume production, our engineering team recommends the following DFM parameters for custom brass pipe fittings:

Thread Relief/Undercuts: Specify a minimum thread relief groove of 1.5x the thread pitch at the base of external NPT/BSPT threads to ensure full thread engagement and prevent tool breakage.

Minimum Wall Thickness: For high-pressure fluid applications (>150 PSI), maintain a minimum wall thickness of 1.5mm to 2.0mm to prevent structural deformation during machining and final torque assembly.

Internal Corner Radii: Allow a minimum internal radius of R0.4mm on non-critical step bores to match standard insert tool radii, reducing the need for specialized micro-boring tools.

Chamfers: Apply a 0.5mm x 45° lead-in chamfer on all threaded ends to facilitate automated assembly and prevent cross-threading.

Machining Equipment & Production Capacity

Our facility is equipped to handle both rapid prototyping and continuous high-volume production of brass fluid connectors.

Swiss-Type CNC Automatics (Turn-Mill): Optimized for complex, small-diameter brass fittings (Ø3mm to Ø32mm). Equipped with 12ft hydrodynamic bar feeders for un-manned 'lights-out' production.

Multi-Tasking CNC Lathes: Capable of single-setup turning, threading, and cross-drilling for components up to Ø150mm, ensuring absolute concentricity between external hex profiles and internal threads.

Production Volume: Standard monthly capacity exceeds 500,000 units for standard brass pipe adapters.

Quality Control & Inspection Standards

We execute strict dimensional and structural validation for all custom brass fittings. Our facility operates under the ISO 9001:2015 quality management system. The inspection protocol includes first article inspection (FAI) and in-process auditing. Thread profiles are verified 100% using calibrated go/no-go ring and plug gauges to prevent galling or leakage in field applications. We utilize Coordinate Measuring Machines (CMM) for complex geometries, optical comparators for angle verification, and surface roughness testers. Material certification (EN 10204 3.1) and ROHS compliance reports are provided per order.

Application Industries

Our CNC machined brass pipe fittings are specified for sectors requiring high corrosion resistance, thermal conductivity, and secure mechanical joints. Target applications include:

HVAC & Refrigeration: Manifold connections, condenser fittings, and expansion valve bodies.

Industrial Fluid Control: High-pressure hydraulic connectors, pneumatic adapters, and gas distribution lines.

Plumbing & Water Distribution: Potable water system connectors requiring low-lead or DZR brass material.

Automotive & Instrumentation: Sensor housings, fuel line brass pipe connectors, and gauge adapters.

Packaging, Thread Protection & Anti-Oxidation

Brass is susceptible to surface tarnishing and thread bruising during global transit. We enforce strict industrial packaging protocols to ensure zero defects upon arrival:

Thread Protection: All external NPT and metric threads are fitted with custom plastic thread protector caps.

Anti-Oxidation (VCI): Finished brass components are sealed in VCI (Volatile Corrosion Inhibitor) bags with desiccants to prevent zinc leaching and surface oxidation during ocean freight.

Physical Isolation: High-precision or thin-walled fittings are shipped in custom-thermoformed blister trays or EPE foam partitions, guaranteeing zero metal-to-metal contact.

Material Traceability & Inspection Documentation

Due to strict Non-Disclosure Agreements (NDAs) with our industrial clients, we do not publish custom part inspection files online. However, strict documentation and material traceability are integrated into every production batch. Depending on your project requirements, Xiamen Dazao Machinery supplies the following certified documentation alongside your shipment:

Material Certifications (EN 10204 3.1): Factory-issued mill test reports detailing the exact chemical composition (e.g., Cu and Zn percentages for C36000) and mechanical yield strength of the raw brass batch.

Dimensional FAI Reports: Complete First Article Inspection logs documenting critical geometrical tolerances, surface roughness measurements, and NPT/BSPT thread verification using calibrated go/no-go gauges.

Compliance Declarations: Verified RoHS, REACH, and California AB 1953 (Lead-Free Plumbing) compliance certificates for designated dezincification-resistant (DZR) and low-lead brass alloys.

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