Overview
XCM CNC supports brass functional samples and small pilot builds under ISO 9001 and IATF 16949 quality systems, using equipment such as Matsuura five-axis machines and Jingshang automatic lathes to validate conductivity, wear, fine threads, and terminal fits.
Grades such as C360, C260, and C510 can be reviewed first for RF connectors, terminals, pneumatic fittings, and small instrument parts, with the sample stage used to confirm plating, anti-tarnish treatment, deburring, and reinspection flow before revision records and pilot planning are released. MOQ can begin from 1 piece, sample lead time is often reviewed in the 3-7 day range, and prototypes can follow the same tolerance logic used for production.
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 3.2 um general machined surfaces
- 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 validated on sample before production
- Thread: Internal from M1.4, external from M2.0, up to M220; NPT / BSP / G / PT pipe threads; depth up to 4xD
- Prototype: MOQ 1 piece; sample lead time 3-7 days; same tolerance as production
Prototype Tolerance Matching Production-Grade Accuracy
Brass samples can follow the same precision logic used in production, with selected critical features at +/-0.003 mm, locating bores reviewed to H7 around +/-0.006 mm, and outer diameter roundness around 0.006 mm. Sample-stage measurement data can then continue into the pilot route instead of requiring a second tolerance setup. Inspection can use Hexagon CMM and go and no-go gauges, and the report format can align with later FAI reports.
Functional Face Validation for Connectors and Terminals
RF connector and terminal prototypes can be used to validate conductive contact faces around Ra 0.8 um, fine-thread engagement from M1.4 upward, and sealing-edge chamfers. After assembly, thread fit, contact condition, and hole position around 0.015 mm can be reviewed and fed back into the drawing. One-setup machining of outer diameters, end faces, and holes helps reduce accumulated positioning error during this validation stage.
Plating and Anti-Tarnish Verification Before Pilot Release
Nickel plating in the 3-20 um range changes thread, fit-bore, and contact-face size on brass samples, so the prototype stage can validate the plating route before pilot production starts. Machining allowance is reserved before plating, then CMM reinspection confirms the real size effect afterward. Anti-tarnish treatment, masking of conductive faces, and isolated packaging can all be reviewed in the same sample route and then written into the pilot process file.
Inspection Records and Pilot Handoff
Sample inspection records can include critical dimensions, thread-gauge results, roughness, and post-finish reinspection data in a format aligned with production FAI reports. Burrs, hole-entry issues, and edge-condition problems found in the sample stage can be written back into the drawing revision history, and pilot production can then use the updated process parameters directly.
Specifications
| Product Name | Cost-Effective Brass Prototype Parts |
|---|---|
| Manufacturer | XCM CNC |
| Factory Location | Shenzhen, Guangdong, China |
| Quality System | ISO 9001, ISO 13485, IATF 16949, GJB9001C |
| Machining Process | CNC turning, CNC milling, drilling, tapping, sample machining review |
| 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 |
| Surface Roughness | Ra 1.6 um contact surfaces, machined surfaces by drawing requirement |
| Surface Treatment | Sample plating, anti-tarnish finish, or polishing by order review |
| Inspection | Dimensional inspection, sample review, and surface treatment recheck by order requirement |
| Application | Functional prototypes, fitting samples, terminal samples, small instrument trial parts |
| Key Features | Micro holes, fine threads, conductive contact faces, plating size effect, and burr control |
| Critical QC Requirements | Sample key dimension recheck, post-finish recheck, revision records, and pilot handoff |
| Batch Range | One-piece functional samples to pilot builds 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
RF Connector and Microwave Connector Prototypes
Typical Parts: RF connector prototype, microwave connector housing, shield sleeve sample
Brass RF connector prototypes can often be reviewed in the 3-7 day range, with production-grade tolerance logic and critical dimensions around +/-0.003 mm plus coaxiality around 0.012 mm. CNC samples can validate fine-thread engagement, conductive-face roughness around Ra 0.8 um, and post-plating assembly condition before pilot release.
Terminal, Pin, and Small Conductive Connector Samples
Typical Parts: Terminal sample, pin sample, small connector seat
Terminal samples are used to validate burr control, insertion contact, and conductive-face dimensions, with drilled hole sizes starting around 0.2 mm and outer diameter roundness around 0.006 mm. The sample stage confirms grade, minimum-hole feasibility, and plating requirements before pilot production starts.
Pneumatic Valve Bodies, Precision Fittings, and Adjustment Parts
Typical Parts: Pneumatic valve body sample, precision fitting sample, adjustment sleeve
Pneumatic and valve samples can validate NPT, BSP, G, and PT thread engagement, sealing chamfers, and assembly space, while sealing faces can be checked around Ra 0.8 um. The prototype route can focus on key bores and threads first, then move into small-batch fitting production after approval.
Small Trial Parts for Instruments and Watches
Typical Parts: Instrument fitting sample, micro gear sample, adjustment knob sample
Small instrument trial parts can validate hole position around 0.015 mm, burr condition, and cosmetic state on compact geometry, with minimum slot width around 0.3 mm. Revision records from the sample stage can then be carried into the pilot process file together with anti-tarnish and later finishing 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 fittings, terminals, and small precision parts, drawing review can confirm conductive faces, threads, and surface-treatment requirements together.
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.
Samples Use the Same Precision Logic as Production
Brass samples can follow the same tolerance, surface-finish, and inspection logic used for later production. Sample reports can align with FAI format so functional-face validation does not need a second setup before pilot work begins.
Sample Issues Feed Directly into the Pilot Route
Thread-fit, burr, and plating-size issues found during sample validation can be written back into the drawing revision record and then reused as updated process parameters in pilot production. Once nickel plating, anti-tarnish treatment, and packaging are validated on the sample, they can be carried forward with less repeated confirmation.
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.
Do your brass prototypes use the same tolerance as production parts?
Yes. Samples can follow the same precision logic used in production, with selected critical features at +/-0.003 mm, locating bores reviewed to H7, and inspection by CMM plus go and no-go gauges. Sample reports can align with later FAI reports so the data can move directly into pilot planning.
What does your brass prototype validation process include?
Validation can include functional-face measurement, thread-gauge checks, roughness confirmation, and post-plating reinspection. Problems found during the sample stage are written back into the drawing revision record, and plating plus packaging requirements can be confirmed at the same time.
How long does it take to move from brass sample approval to first batch?
After the sample is approved, regular parts can often move into a first batch within about 10-15 days, depending on part complexity and order quantity. Pilot scheduling then uses the sample-stage process parameters, plating route, and inspection standard to reduce retuning time.
Can you machine one-piece brass prototypes before pilot production?
Yes. A single brass sample can be used to validate conductive faces, threads, and assembly conditions. Sample lead time is often reviewed in the 3-7 day range, depending on complexity, finishing, and the reinspection scope, and pilot production can be arranged after approval.
How do you handle revision changes between brass prototype iterations?
Each sample round can be recorded in the drawing revision file, including dimensional changes, burr standards, and finishing updates. The next sample then uses the latest approved revision, and the pilot batch follows the final confirmed version to avoid version mix-ups.
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.
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