Brass Round Bar Grade CZ121 | 8mm Diameter x 270mm | Model Making & Engineering

A single length of Grade CZ121 free-cutting brass round bar, 8mm 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 8mm diameter and 270mm length is a practical format for slimmer turned components, pins, axles, and precision parts. 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.
• 8mm Diameter x 270mm Length: A slim, versatile diameter suited to pins, axles, small bushes, and precision turned components.
• 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: 8mm
• 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 an 8mm brass round bar? Common applications include pins, axles, small bushes, standoffs, electrical contacts, model engineering components, decorative fittings, and general hobby and workshop parts. The 8mm diameter is particularly useful for projects requiring a slimmer rod than a 10mm or 12.7mm bar.

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.

How does 8mm compare to the 10mm and 12.7mm versions? The 8mm bar is the slimmest of the three diameters available. Choose 8mm for fine, precision components where a smaller cross-section is needed. The 10mm is a mid-range general-purpose size, and the 12.7mm (1/2") is the largest option, suited to heavier-duty components requiring more material.