Overview
XCM CNC provides OEM brass CNC turning and milling for build-to-print parts, supported by ISO 9001 and IATF 16949 quality systems and imported equipment from brands such as DMG and Mazak.
Grades such as C360, C260, and C510 can be reviewed against conductivity, wear, and small precision part requirements before machining starts. MOQ can begin from 1 piece, with standard lead time often reviewed in the 10-15 day range. For RF connectors, terminal bases, pneumatic fittings, and valve fittings, the sample stage is used to confirm nickel plating, anti-tarnish expectations, fine threads, micro holes, and burr control before batch production is released.
Key Capabilities
Machining Parameters and Tolerances
- Materials: C360 (free-cutting brass), C260 (cartridge brass), C510 (phosphor bronze), selected by conductivity, wear resistance, and lead-free requirement
- Tolerance: +/-0.003 mm (+/-0.00012 inch), IT5 or IT6 accuracy, +/-0.01 mm shaft/bore fits; h6/H7 available
- Surface Finish: Ra 0.8 um turned surfaces, Ra 1.6 um milled contact faces, Ra 0.2 um polished surfaces, seal faces Ra 0.8 um
- GD&T: Coaxiality 0.012 mm, runout 0.01 mm, cylindricity 0.011 mm, roundness 0.006 mm, position 0.015 mm
- Max Size: 3-axis milling 3000 x 1600 x 1400 mm; turning diameter 1250 x length 2000 mm
- Surface Treatment: Nickel plating (3-20 um), anti-tarnish finish, passivation, polishing by order review
- Thread: Internal from M1.4, external from M2.0, up to M220; NPT / BSP / G / PT pipe threads; depth up to 4xD
- Inspection: CMM report, FAI report, material certificate by order
Assembly Tolerance and Connector Fit Control
Fit-critical dimensions on brass OEM connectors and terminals can be controlled to +/-0.003 mm, with shaft and bore fits reviewed to h6 and H7 classes. RF connector housings can be reviewed for coaxiality around 0.012 mm, while terminal pin runout can be controlled around 0.01 mm. During the sample stage, CMM inspection can confirm these dimensions one by one, and machining allowance can be reserved for nickel plating thickness in the 3-20 um range to reduce post-plating interference risk.
Turn-Mill Coverage for Small Precision Brass Parts
Turn-mill machining helps complete outer diameters, end faces, threads, and drilled holes in one setup, which reduces accumulated error from repeated positioning. Minimum drilled hole size can start from 0.2 mm, internal threads can start from M1.4, and turned outer diameters can reach Ra 0.8 um. For RF connectors and terminal bases, hole position around 0.015 mm can be controlled while the thread and conductive contact faces are machined in the same setup.
GD&T Control for Threaded Fittings and Connector Parts
Threaded brass fittings can follow GD&T callouts such as roundness 0.006 mm, cylindricity 0.011 mm, and coaxiality 0.012 mm. Fine threads can be checked item by item with go and no-go gauges, and sealing faces can be machined to Ra 0.8 um. Pipe thread standards including NPT, BSP, G, and PT can be supported, with thread depth up to 4xD and effective blind-hole depth around 50 mm when the structure allows it.
Inspection and FAI Reporting for OEM Sample Approval
OEM brass samples can be supplied with CMM dimensional reports, FAI reports, and material certificates, using equipment such as Hexagon CMM and a WanHao VMS-3020G vision system. Threads can be checked with go and no-go gauges, plating thickness reports can be added after finishing, and critical dimensions can be inspected item by item. Report format can follow the customer template before the batch route is released.
Specifications
| Product Name | OEM Brass CNC Turned and Milled Parts |
|---|---|
| Manufacturer | XCM CNC |
| Factory Location | Shenzhen, Guangdong, China |
| Quality System | ISO 9001, ISO 13485, IATF 16949, GJB9001C |
| Machining Process | CNC turning, CNC milling, turn-mill machining, drilling, tapping |
| Material | Brass |
| Material Grade | C360, C260, C510 selected by conductivity, wear, and lead-free requirement |
| Tolerance | +/-0.03 mm standard CNC tolerance, critical dimensions by drawing review |
| Precision Tolerance | +/-0.003 mm for selected small precision features after review |
| Surface Roughness | Ra 1.6 um contact surfaces, machined surfaces by drawing requirement |
| Surface Treatment | Nickel plating, anti-tarnish finish, passivation, or polishing by order review |
| Inspection | Dimensional inspection, thread gauge, FAI, and plating report by order requirement |
| Application | RF fittings, terminal bases, pneumatic fittings, valve fittings, and small instrument parts |
| Key Features | Micro holes, fine threads, contact faces, burr control, and plating size recheck |
| Critical QC Requirements | Burr control, thread inspection, post-plating recheck, and lead-free or surface requirement confirmation |
| Batch Range | Prototype samples to repeat production by drawing review |
| MOQ | 1 Piece |
| Typical Lead Time | 10-15 business days after drawing review |
| Drawing Formats | STEP, IGS, DWG, PDF, X_T |
Applications
Custom RF Connectors, Terminal Bases, and Antenna Bases
Typical Parts: RF connector housing, terminal block, antenna base
Brass combines conductivity, good machinability, and compatibility with fine-thread machining, so it suits build-to-print RF connectors and small bases. During the sample stage, CNC turning and milling can confirm thread fit, micro-hole burr control, and plated assembly size, with coaxiality reviewed around 0.012 mm.
Electrical Connectors and Small Conductive Terminals
Typical Parts: Conductive terminal, pin contact, shield sleeve
Small terminals need stable conductive contact and clean edges. Brass machinability helps control burr condition on 0.2 mm holes and pin outer diameters. DFM review can focus on minimum drilled holes, pin diameters, and chamfer deburring before design changes are released for the batch.
Valve, Plumbing, and Pneumatic Fittings
Typical Parts: Plumbing fitting, pneumatic fitting, valve seat
Brass suits fitting parts that depend on threads, sealing edges, and common media resistance, with pipe thread standards such as NPT, BSP, G, and PT supported. Build-to-print review should confirm internal and external threads, sealing chamfers, and finishing requirements first, while sealing faces can be machined to Ra 0.8 um.
Small Parts for Watches and Precision Instruments
Typical Parts: Micro gear, adjustment knob, instrument fitting
Small instrument parts often need fine holes, thin steps, and stable cosmetic condition, and brass machinability helps control burrs and dimensional consistency. Samples can be reviewed from STEP or DWG files, with selected small precision features reaching +/-0.003 mm and machining allowance adjusted later for plating or anti-tarnish requirements.
Why Choose Us
Certified Systems and Equipment Coverage
The factory organizes quality flow under ISO 9001, ISO 13485, IATF 16949, and GJB9001C, while using DMG, Mazak, Matsuura, Brother, and other equipment for brass turning, milling, and multi-face machining. For brass connectors, terminals, and small precision parts, drawing review can confirm conductive faces, threads, and surface-treatment requirements in the same process.
Broad Size Coverage
The machining range covers both small connector-scale parts and larger structural blocks. Three-axis travel can reach 3000 x 1600 x 1400 mm and turning diameter can reach 1250 mm, while the actual route still depends on fixturing, grade, and surface-treatment requirements.
Tiered Equipment Strategy for Cost and Quality
XCM CNC uses a tiered equipment mix from mainland China, Taiwan, Japan, and Europe or the US. Lower-tolerance work can be arranged on domestic or Taiwan machines, while tighter precision work can move to imported machines such as DMG or Mazak. That matching helps control cost without putting simple features onto high-hour-rate equipment.
Fine-Thread and Sealing-Face Review Before Production
Fine threads, sealing edges, and burr-sensitive hole entries on brass fittings can be reviewed in DFM before machining starts. When a design changes, thread class, chamfers, and plated fit dimensions are checked first so sample rework can be reduced.
Plating and Anti-Tarnish Requirements Locked Through Samples
Nickel plating, passivation, or anti-tarnish requirements can be confirmed during sample approval together with thickness standards and reinspection scope. For brass parts that need both conductivity and appearance, surface-treatment and protective packaging requirements can be written into the order before batch release.
FAQ
How do you choose C360, C260, or C510 for a brass CNC part?
Selection usually starts from conductivity, wear, self-lubrication, forming demand, and whether a lead-free requirement applies. Final grade choice still depends on the drawing, contact faces, post-treatment, and the real use condition, so one material name should not be substituted automatically for another.
How do you prevent discoloration on machined brass parts?
The first step is to confirm whether nickel plating, passivation, anti-tarnish treatment, or isolated packaging is required, then arrange the related reinspection. Process route, thickness standard, and masking requirements for conductive faces are confirmed by order rather than applied as one default solution.
How do you control burrs on small brass terminals or threaded fittings?
Burr control on small brass parts usually combines tool-path adjustment, chamfering, deburring operations, and go and no-go gauge checks. For fine threads, hole entries, and sealing edges, machining sequence still needs to be confirmed against part size, batch size, and inspection scope.
What is the sample approval process for OEM brass parts?
After receiving the drawing, DFM review and grade confirmation are completed first, then the sample is machined. Sample lead time is often reviewed in the 3-7 day range. Once the sample is finished, CMM and FAI reports can be provided, and batch production is released only after size and surface condition are approved.
What drawing files do you need for custom brass turned and milled parts?
Quotation and DFM review usually need 2D or 3D files, material grade, tolerance, quantity, and application notes. STEP, IGES, STP, DWG, and PDF can all be used. If plating, anti-tarnish treatment, fine threads, or conductive faces are involved, those sample priorities should also be marked clearly.
Can you confirm plating or anti-tarnish requirements before brass sample approval?
Yes. Nickel plating, anti-tarnish, and related surface-protection requirements can be included in the brass sample review. Thickness reports, masking of conductive faces, and post-plating reinspection are all confirmed item by item according to the order and the drawing.
Request a CNC Machining Quote from XCM CNC
Send us your drawings. Our team will review the file and reply with a machining quote. MOQ: 1 piece, with competitive low-cost pricing.
Email: [email protected] | WhatsApp: +8618638951317
