Brass and Copper Parts — Electrical Conductivity and Decorative Finishes
Brass and copper are the specialty metals for electrical, thermal and decorative applications. At SkillsProto we CNC machine, sheet-metal fabricate and finish brass and copper parts for electrical connectors, heatsinks, plumbing fittings and premium decorative hardware.
If your design needs electrical conductivity, thermal conductivity or a distinctive gold / bronze finish, brass or copper is the answer.
Brass vs copper at a glance
| Property | Brass (C360 / C260) | Copper (C110 / C101) |
|---|---|---|
| Composition | Copper + zinc (typically 30% Zn for free-machining C360) | 99.9%+ pure copper |
| Density | 8.5 g/cm³ | 8.96 g/cm³ |
| Electrical conductivity | 26% IACS (C360) to 37% IACS (C260) | 100% IACS (highest of any commercial metal) |
| Thermal conductivity | 110 W/m·K | 391 W/m·K (highest of any commercial metal) |
| Machinability | Excellent (C360 is the standard free-machining brass) | Fair (gummy, sharp tools needed) |
| Corrosion resistance | Good | Excellent (forms protective patina) |
| Colour | Yellow / gold | Reddish |
| Typical cost | Moderate | Higher |
| Common uses | Connectors, fittings, decorative hardware | Busbars, heatsinks, RF, audio |
When to choose brass
- Electrical connectors and terminals — high conductivity + easy machining.
- Plumbing fittings and valves — corrosion resistance + machinability.
- Decorative hardware — distinctive gold colour, polished or brushed.
- Instrument components — precision machining + traditional material.
- Lock cylinders and gears — wear resistance + machinability.
When to choose copper
- Electrical busbars and high-current conductors — unmatched conductivity.
- Heatsinks for high-power electronics — best thermal conductivity.
- RF and microwave components — high-frequency performance.
- Audio components — signal purity for premium audio.
- Architectural and decorative panels — distinctive finish, develops protective patina.
Machining notes
- Free-machining brass (C360) is the easiest metal to machine — high speeds, fine finish, low tool wear.
- Copper is gummy — sharp tools, low surface feet per minute, light cuts.
- Tolerances to ±0.05 mm achievable on both materials.
- Lead time typically 5–10 working days.
Finishing options
- Polishing — mirror finish for decorative parts.
- Brushed / satin — linear satin for architectural panels.
- Lacquering — preserve polished finish, prevent tarnish.
- Nickel / chrome plating — over copper-nickel underlayer for premium hardware.
- Antique / patina finish — chemical darkening for decorative effect.
Frequently Asked Questions
Q1: Which brass is best for precision machining? A: C360 (free-machining brass) — chips break cleanly, finish is excellent, tolerances hold easily.
Q2: Does copper tarnish? A: Yes — copper forms a green patina over time outdoors (protective). Lacquer or wax preserves the polished finish.
Q3: Are brass parts RoHS compliant? A: Yes, with lead-free brass alloys (C27450 / C69300). Tell us on your RFQ if RoHS is required.