Brass Round Bar Grade CZ121 | 10mm Diameter x 270mm | Model Making & Engineering

A single length of Grade CZ121 free-cutting brass round bar, 10mm diameter x 270mm (approx. 10.5") long. CZ121 is the most widely used free-machining brass alloy in the UK, offering excellent machinability, corrosion resistance, and a clean golden finish — suitable for a broad range of engineering, hobby, and manufacturing applications.

Who Is This For?

Ideal for model makers, engineers, hobbyists, machinists, and DIY enthusiasts working on small-scale components, fittings, and parts. The 10mm diameter and 270mm length is a practical format for a wide range of turning, milling, drilling, and cutting tasks. Suitable for both professional workshop and home workshop use.

Key Features

• Grade CZ121 Free-Cutting Brass: The standard free-machining brass grade in the UK. The lead content acts as a lubricant and chip-breaker during machining, giving smooth, consistent results and extended tool life.
• 10mm Diameter x 270mm Length: A versatile size suited to a wide range of small components, pins, bushes, and fittings.
• Corrosion Resistant: Brass alloy provides excellent resistance to corrosion in air, water, and many chemicals — suitable for indoor and outdoor applications.
• Attractive Golden Finish: Clean, bright finish straight from stock — suitable for decorative and functional applications.
• Virgin Material: Made from new, unrecycled brass stock for consistent composition and maximum strength.
• Easily Worked: Can be machined, turned, drilled, sawn, filed, soldered, and brazed using standard workshop tools and techniques.

Specifications

• Grade: CZ121 (free-cutting brass)
• Diameter: 10mm
• Length: 270mm (approx. 10.5")
• Form: Round bar / rod
• Finish: Bright
• Material: Brass alloy (copper-zinc with lead)

Frequently Asked Questions

What is CZ121 brass? CZ121 is the British Standard designation for free-cutting brass — a copper-zinc alloy with a small lead addition. The lead content makes it highly machinable by acting as a built-in lubricant and chip-breaker during cutting operations. It is the most commonly specified brass grade for precision turned parts in the UK.

What can I make from a 10mm brass round bar? Common applications include small turned components, pins, axles, bushes, standoffs, fittings, decorative parts, model engineering components, electrical contacts, and general hobby and workshop projects.

Can I cut this bar to length at home? Yes. CZ121 brass can be cut using a hacksaw, junior hacksaw, metal-cutting bandsaw, or angle grinder with a metal disc. It cuts cleanly and does not harden during cutting.

Is brass suitable for outdoor use? Yes. Brass is corrosion-resistant in most outdoor environments. It will develop a natural patina over time if left unfinished, or can be lacquered to maintain a bright appearance.