Back to Brass Square Bar
C360
Free-Cutting Brass Square Bar
C36000
Overview
C360 is the benchmark for machinability in copper alloys, rated at 100% on the machinability scale. The addition of ~3% lead creates microscopic lubricating particles that provide excellent chip breakage and tool life during high-speed screw machine operations. It combines good strength, corrosion resistance, and an attractive golden finish. C360 is the most widely specified brass for precision machined components.
Chemical Composition
| Element | Min | Max |
|---|---|---|
| Copper (Cu) | 60.0 | 63.0 |
| Zinc (Zn) | 35.0 | 37.5 |
| Lead (Pb) | 2.5 | 3.7 |
| Iron (Fe) | 0 | 0.35 |
Alloy Designations
UNSC36000
ASTMB16, B124
SAEJ461, J463
AMS4610
FederalQQ-B-637
Mechanical Properties
Tensile Strength49,000 – 68,000 psi
Yield Strength (0.5% ext.)18,000 – 45,000 psi
Elongation in 2"18 – 53%
Rockwell HardnessF65 – B80
Shear Strength35,000 – 45,000 psi
Physical Properties
Density0.307 lb/in³ (8.50 g/cm³)
Melting Point1,630 – 1,650 °F (885 – 899 °C)
Electrical Conductivity26% IACS
Thermal Conductivity67 BTU/ft·hr·°F
Modulus of Elasticity14,000 ksi
Coefficient of Thermal Expansion11.4 × 10⁻⁶ /°F
Typical Applications
- Automatic screw machine products
- Gears, pinions, and lock components
- Valve stems, fittings, and connectors
- Plumbing fixtures and faucet bodies
- Decorative hardware and door knobs
- Electrical terminals and switchgear parts
- Engraving plates and signage
- Industrial fasteners and inserts
Fabrication & Joining
- Machinability rating: 100% — the industry benchmark
- Good hot workability for forging and extrusion
- Fair cold workability
- Readily soldered and brazed — not recommended for gas-shielded arc welding
- Lead content provides excellent chip breaking
- Available in half-hard and hard tempers for improved strength