Cheap Brass CNC Machined Parts Supplier

XCM CNC provides a cost-focused brass CNC machining approach built around grade selection between C360 and no-lead options, standardization of terminal and fitting dimensions, and optimization of tolerance and surface requirements on non-critical faces. Working under ISO 9001 and IATF 16949 quality systems with Brother and Taichung machining centers, the goal is to keep tighter control only on critical conductive positions while reviewing bar-stock utilization, setup count, and necessary plating in the same cost model. MOQ can begin from 1 piece, with standard lead time often reviewed in the 10-15 day range. Cheap cnc machining services from a direct factory supplier.

Machining Parameters and Tolerances

• Materials: C360 (free-cutting brass), C260 (cartridge brass), C510 (phosphor bronze), selected by conductivity, lead-free requirement, and cost
• Tolerance: +/-0.003 mm (+/-0.00012 inch), IT5 or IT6 accuracy, ±0.01 mm shaft/bore fits; h6/H7 available
• Surface Finish: Ra 3.2 μm general machined surfaces, Ra 1.6 μm functional contact faces, Ra 0.8 μm turned 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 × 1600 × 1400 mm; turning diameter 1250 × length 2000 mm
• Surface Treatment: Nickel plating, anti-tarnish finish, passivation, polishing — applied to functional faces by order review
• Thread: Internal from M1.4, external from M2.0, up to M220; NPT / BSP / G / PT pipe threads; depth up to 4×D
• Cost Note: Standard ±0.03 mm and Ra 3.2 μm included in base machining cost; tighter specs priced separately

Standard Tolerance and Surface Finish Included in Base Cost

Standard brass tolerance around +/-0.03 mm and general surface finish around Ra 3.2 um are included in the base machining quote without added precision cost. Only conductive faces, fit bores, or sealing faces that need to tighten toward +/-0.01 mm or Ra 0.8 um are priced separately. This grading model suits terminals, fittings, and bushings by placing cost only on the features that actually affect function.

Brass Grade Selection for Cost-Controlled Projects

C360 free-machining brass is a practical default for many terminals and fittings because it cuts efficiently and reduces tool wear. C260 and C510 can then be reserved for positions that need specific forming, wear, or lead-free performance. Grade layering avoids putting the whole part onto a higher-cost material route, while standardized bar sizes improve utilization and reduce scrap.

DFM Review for Thread, Hole, and Feature Standardization

Standard threads above M2.0 with depth within 4xD and regular hole sizes above 0.5 mm can usually be machined on standard equipment with controllable cycle time and tool cost. During DFM review, over-deep micro holes above L/D 10, extra-fine threads below M1.4, and non-standard slots can be flagged first to evaluate whether they should be adjusted to more standard geometry. Standardizing thread sizes and hole-slot dimensions helps reduce tool changes and related machine time.

Plating and Post-Processing Cost Optimization by Feature Grading

Nickel plating, anti-tarnish treatment, and related post-processing can be applied only to functional conductive or appearance faces, while non-critical faces stay in the machined condition. Whole-part plating and whole-part reinspection are usually more expensive than graded treatment, so the plating scope is confirmed during quotation to avoid unnecessary cost during batch production.

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.

Tolerance and Finishing Quoted by Feature Grade

Critical conductive faces, threads, and fit positions can keep tighter control, while ordinary outer surfaces and non-critical structure faces follow standard tolerance around +/-0.03 mm and Ra 3.2 um. The quotation stage makes those boundaries explicit so hidden cost does not appear later in production.

DFM Review Flags High-Cost Features Early

Deep micro holes, extra-fine threads, and whole-part plating are common cost drivers on brass parts, so DFM review highlights them first and evaluates whether they can move toward more standard geometry. On general fittings, bushings, and adjustment parts, thread size, hole depth ratio, and finishing scope can all be confirmed before quotation is finalized.