About This Part
Connector bodies are the interface between a cable, a PCB or a device housing — and they have to do three things perfectly: align pins or contacts at micron-level accuracy, maintain consistent impedance for signal integrity, and survive thousands of mating cycles without degrading. In rf connector housing machining, even a minor step or scratch on an internal cavity changes impedance and degrades signal performance, and those errors are not always visible on a CMM report because they live on internal surfaces that are difficult to probe. This is cnc machined brass base work where small features and cosmetic surface quality are inseparable from electrical performance. This electrical connector cnc component is machined from **Brass**, a copper-zinc alloy chosen for its excellent electrical conductivity, natural corrosion resistance, and free-machining characteristics that allow tight-tolerance small features to be cut cleanly without excessive tool wear. Pin cavities, mounting faces, thread forms and RF body geometry are all held to **±0.005 mm on critical dimensions**. The cnc machined brass base is a 5-axis milled part because connector geometry often requires access to internal features and external faces from multiple angles in a single setup — repositioning a small connector body in a fixture introduces more error than the total tolerance budget allows.
**Part:** Copper Connector Base
**Process:** 5-axis CNC milling
**Material:** Brass
**Tolerance:** ±0.005 mm on critical dimensions
**Inspection:** 100% CMM verification, full report with shipment
Challenges of This Part & How We Machined It
Small-feature precision in pin cavities and RF geometry
Connector bodies are dense with small features: pin bores under a millimeter, dielectric seats, snap-ring grooves and internal shoulders that define electrical path lengths. A 0.01 mm error on a cavity diameter or a step height changes impedance enough to fail RF return-loss specs, and a broken micro-tool inside a deep cavity can scrap a nearly finished part. We use purpose-built micro-tooling with appropriate stick-out, run feed rates tuned to prevent tool deflection on small diameters, and we verify critical internal geometry with pin gauges and the CMM rather than relying solely on tool offsets. Pin cavities are spot-checked with air gauging or custom plug gauges for production runs.
Brass chip control on critical surfaces
Brass cuts fast and forms chips that range from short and manageable (free-machining grades) to long and stringy (standard and lead-free brasses). Stringy chips wrap around end mills, drag across finished surfaces, and leave scratch marks that ruin cosmetic and electrical-contact surfaces. A chip-wipe scratch on a mating face may not break electrical contact, but it looks like a defect and can concentrate stress in a part that sees repeated mating cycles. We select chip-breaker inserts for turning and milling operations, use high-pressure coolant directed at the cutting zone, and program pecking or chip-breaking cycles on deep features. The result is a connector body that comes off the machine clean, with no chip-wipe scratches on contact faces.
Surface finish for mating and conductivity
A connector body is a contact surface. Rough surfaces cause high contact resistance, visible tool marks on external faces degrade perceived quality, and any burr left on a mating face can prevent a connector from seating fully or from making a reliable ground contact. We finish contact faces and mating diameters with fine-pitch passes at controlled surface speeds, deburr internal cross-holes under magnification, and protect finished surfaces during part handling. The connectors arrive ready for plating or assembly, with no handwork required to remove burrs or improve finish.
Machining Sequence
1. **CAM programming with micro-tooling strategy** — toolpaths for small pin cavities, thread mills and 5-axis-indexed features are programmed and simulated to avoid tool collisions in tight spaces.
2. **5-axis rough milling** — bulk material removal from the brass blank, with generous coolant flow and chip-breaking cycles to prevent chip recutting and surface damage.
3. **5-axis finish milling** — pin cavities, RF body geometry, threads and external faces finished in a single setup to maintain alignment between internal and external features.
4. **Deburring and surface protection** — edges are broken, internal cross-holes deburred, and parts are individually bagged or wrapped to protect contact surfaces during shipment.
5. **CMM and pin-gauge inspection** — cavity diameters, pin positions, thread gauging and critical datums verified; CMM report included.
What You Get With Every Order
- **Free DFM review before quoting** — we flag manufacturability risk early, not after parts are made - **First Article Inspection report** with the first batch - **CMM dimensional report** on critical features - **Material certificates** for aerospace and medical grades - **Direct communication with the shop** — no trading company in between, we make the parts ourselves
Have a Drawing?
Send us your drawing or STEP file and we will come back with pricing within 48 hours. Prototype quantities and production runs both welcome — no minimum order quantity.
**TruPart Precision** trupartprecision.com | sales@trupartprecision.com WhatsApp: +86 137 1278 3205 No.114 Xinhua Road, Xinhe Dev Zone, Wanjiang, Dongguan, China