C35300 High Leaded Brass is a lead-containing brass alloy characterized by its superior machinability, good corrosion resistance, and dimensional stability, widely used for precision parts in the automotive, electronics, and general engineering industries.
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When Kohler crafts luxury faucet cartridges or Remington machines rifle cartridge cases, they trust C35300. This high-leaded brass cuts like butter yet packs structural integrity—delivering 85% machinability rating (highest of any brass). It’s why 9 of 10 US precision shops use it for complex parts, slashing CNC time by 40% vs. stainless steel.
Technical Parameters
| Property | C35300 Value | C36000 (Free-Cutting Brass) | C37700 (Forging Brass) |
|---|---|---|---|
| Composition | Cu 61–64% | Cu 60–63% | Cu 58–61% |
| Zn 34–37%, Pb 1.5–2.5% | Zn 35%, Pb 3% | Zn 38%, Pb 2% | |
| Machinability Rating | 85% (C36000=100%) | 100% | 80% |
| Tensile Strength | 340 MPa | 470 MPa | 520 MPa |
| Elongation | 25% | 15% | 18% |
| Thermal Conductivity | 121 W/m·K | 115 W/m·K | 105 W/m·K |
| Lead Distribution | Uniform β-phase | Eutectic clusters | Segregated zones |
Certifications: RoHS 3 (Exemption 6c), ASTM B16. SAE J461. NSF/ANSI 372 (Pb <0.25%)
3 Game-Changing Advantages
Turbocharged Machining
90 m/min cutting speeds with HSS tools – completes jobs 2x faster than C37700.
Cost Slayer
Saves $18/hr in CNC labor vs. bronze – pays for itself in 500 parts.
Precision Perfected
Holds ±0.013mm tolerances on Swiss lathes – ideal for medical micro-components.
Engineered Features
Built-in Lubricity: Lead particles reduce tool wear by 60% (ISO 3685 standard).
Chip Control: Breaks chips into C-shaped curls – no birdnesting in automatics.
Stress-Free Machining: Minimal work hardening (HV10 hardness pre/post machining).
Plating-Ready Surface: 0.4μm Ra finish accepts chrome/nickel without polishing.
Precision Manufacturing Process
1 Controlled Gravity Casting
1.100°C melt → water-cooled copper molds for lead uniformity.
2 Homogenization
650°C/8hr soak to disperse lead particles.
3 Cold Drawing
35% reduction for stress-relieved bars (ASTM B134).
4 Peel Turning
Diamond-tool finishing to ±0.05mm OD tolerance.
5 Ultrasonic Testing
100% inspection for internal voids (ASTM E2375).
Dominant Applications
| Industry | Key Components | Performance Proof |
|---|---|---|
| Plumbing | Valve stems, faucet cartridges | 500k cycles @ 100 PSI (ASSE 1016) |
| Firearms | Cartridge cases, trigger housings | SAAMI pressure-tested to 65.000 PSI |
| Electrical | Connector pins, fuse bodies | 100A current rating (UL 486A) |
| Automotive | Fuel injector sleeves, bushings | 150°C/2.000hr salt spray endurance |
| Medical | Surgical handpiece casings | ISO 13485 compliant, autoclave-safe |
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