Leaded Free-Cutting Brass C48500

Alternative Material Options

For applications where lead-free compliance is mandatory, Silicon Brass C87850 offers excellent machinability without the use of lead. If higher strength and corrosion resistance are required, Aluminum Bronze C95400 is a robust alternative. For general-purpose brass die casting with good overall properties, Brass 360 is a widely available option. When superior thermal and electrical conductivity are the primary concerns, C17500 copper alloy may be selected. For cost-sensitive applications that still require good machinability, Brass 380 provides a balanced solution. In non-copper alternatives, high-strength Zamak 5 zinc alloy or lightweight A380 aluminum alloy can be considered, as their respective properties align with the application needs.

International Equivalent / Comparable Grade

Design Purpose

C48500 was specifically formulated to meet the demanding requirements of high-speed, precision machining of brass components, where extended tool life and excellent surface finish are critical. The intentional lead addition creates discontinuous chips that prevent built-up edge on cutting tools, significantly reducing machining forces and heat generation. This design purpose makes it ideal for manufacturing intricate parts with tight tolerances, deep drilling operations, and complex threading—all while maintaining good pressure-tightness and corrosion resistance typical of brass alloys. Its development aimed to maximize production throughput and minimize manufacturing costs for components requiring extensive secondary operations after the metal casting process.

Chemical Composition

Physical Properties

Mechanical Properties

Key Material Characteristics

• Excellent free-cutting characteristics with 100% machinability rating.

• Superior chip formation prevents long, stringy chips during machining.

• Good corrosion resistance in freshwater and atmospheric environments.

• Maintains pressure tightness suitable for plumbing and hydraulic applications.

• Good wear resistance and anti-galling properties for moving components.

• Features an attractive gold-like appearance, ideal for decorative hardware applications.

• Excellent castability with good fluidity and minimal shrinkage porosity.

• Capable of maintaining tight tolerances during high-volume production.

• Compatible with all common post-processing techniques.

• Extended tool life reduces manufacturing costs for machined components.

Manufacturability And Post Process

• Copper Die Casting: Primary process for high-volume production of C48500 components.

• Post Machining: Excellent machinability enables high-speed drilling, tapping, and milling.

• CNC Machining: Ideal for complex geometries with tight tolerances (±0.025 mm).

• Thread Cutting and Tapping: Produces clean, precise threads with minimal tool wear.

• Drilling and Boring: Capable of deep hole drilling with excellent chip clearance.

• Tumbling: Effective for deburring and achieving uniform edge radiusing.

• Sand Blasting: Creates uniform matte surface texture for aesthetic or functional purposes.

Suitable Surface Treatment

• Polishing and Buffing: Achieves a high-luster mirror finish for decorative applications.

• Clear Lacquering: Preserves natural brass appearance while preventing tarnishing.

• Electroplating: Compatible with nickel, chrome, and gold plating for enhanced appearance.

• Powder Coating: Provides durable, colored finishes with proper surface preparation.

• Antique Patina: Chemical treatments create the appearance of aged or vintage effects.

• Passivation: Chemical treatment enhances tarnish resistance while maintaining metallic look.

Common Industries and Applications

• Plumbing fixtures, valve bodies, and water distribution components.

• Electrical connectors, terminals, and switchgear components.

• Precision gears, bearings, and bushings for mechanical assemblies.

• Architectural hardware, door handles, and decorative fittings.

• Musical instrument components and mechanical parts.

• Firefighting equipment and industrial valve applications.

• Lock mechanisms and security hardware components.

When to Choose This Material

• High-volume machining applications: Significantly reduces machining time and extends tool life.

• Complex threaded components: Produces clean, precise threads with minimal tapping effort.

• Plumbing and fluid handling systems: Offers excellent corrosion resistance and pressure tightness.

• Decorative hardware with machining requirements: Combines aesthetic appeal with manufacturability.

• Electrical components needing good conductivity: Provides 26% IACS electrical conductivity.

• Wear-resistant moving parts: Good anti-galling properties for bearings and bushings.

• Cost-sensitive precision parts: Reduces overall manufacturing costs through improved machinability.