01 What is Brass CNC Machining?
Brass CNC machining is a subtractive manufacturing process where computer-controlled machines precisely cut, shape, mill, and drill brass workpieces to produce custom precision parts. A digital CAD file drives the CNC machine's cutting tools — end mills, drills, and turning tools — to remove material layer by layer until the final geometry is achieved.
At Krsnaye Industrial, we machine brass on our advanced 3-axis, 4-axis, and 5-axis CNC machining centers, producing everything from simple turned components to complex multi-feature parts — for prototyping and full-scale production runs.
02 Why Choose Brass for CNC Machining?
Brass is one of the most popular materials for CNC machining due to its exceptional combination of physical, mechanical, and aesthetic properties. It is widely used across electronics, plumbing, automotive, medical, and decorative industries.
High Machinability
Machinability rating of 100% — the easiest metal to machine. High cutting speeds with minimal tool wear.
Corrosion Resistance
Excellent resistance to corrosion in atmosphere, water, and many chemicals. Ideal for plumbing and marine use.
High Strength
Good tensile strength with excellent ductility. Can withstand both cold and hot pressure processing.
Electrical Conductivity
15–28% IACS conductivity — far better than steel. Widely used in electrical connectors and terminals.
Aesthetic Appeal
Bright golden finish. Ideal for decorative parts, architectural components, and premium fittings.
Cost-Effective
Lower material and machining cost compared to stainless steel. Reduces total production cost significantly.
03 Brass Grades & Alloys We Machine
Not all brass alloys are the same. The composition of copper, zinc, and trace elements such as lead, tin, or aluminum significantly affects machinability, strength, and corrosion resistance. At Krsnaye, we work with all standard brass grades:
| Grade | Common Name | Composition | Machinability | Best For |
|---|---|---|---|---|
| C360 | Free-Machining Brass | 61.5% Cu, 35.5% Zn, 3% Pb | 100% | Screws, fittings, gears, valve bodies |
| C260 | Cartridge Brass | 70% Cu, 30% Zn | 30% | Deep drawing, ammunition, springs |
| C230 | Red Brass | 85% Cu, 15% Zn | 30% | Decorative, architectural, plumbing |
| C220 | Commercial Bronze | 90% Cu, 10% Zn | 30% | Architectural applications, coins |
| C464 | Naval Brass | 60% Cu, 39.2% Zn, 0.8% Sn | 26% | Marine hardware, fasteners |
| HPB59 | Lead Brass | 59% Cu, 40% Zn, 1% Pb | 80% | Turned parts, plumbing fittings |
04 Our Brass CNC Machining Process
Krsnaye Industrial follows a rigorous, step-by-step process to ensure every brass machined part meets your exact specifications:
- Step 1 — DFM Review: We analyse your STEP, IGES, or DWG file for Design for Manufacturability (DFM) and provide free feedback before quoting.
- Step 2 — Material Selection: We recommend the optimal brass grade based on your application, tolerance requirements, and surface finish needs.
- Step 3 — CNC Programming: Skilled CAM engineers create optimised toolpaths for your part geometry, minimising machining time and tool wear.
- Step 4 — Precision Machining: Parts are machined on our 3-axis, 4-axis, or 5-axis CNC machining centers. Brass turning on our 12-set turning-milling compound lathes.
- Step 5 — CMM Inspection: Every part is dimensionally inspected using Coordinate Measuring Machines (CMM) with full inspection reports provided.
- Step 6 — Surface Finishing: We apply your specified surface finish — nickel plating, chrome, electropolishing, or as-machined — before packing.
- Step 7 — Packing & Dispatch: Parts are carefully packed to prevent transit damage and dispatched with traceable shipping across India and internationally.
05 Tolerances & Precision
Brass's excellent machinability allows Krsnaye to hold extremely tight tolerances consistently across prototype and production quantities:
| Tolerance Type | Standard | Fine (on request) |
|---|---|---|
| Linear Dimensions | ±0.01 mm | ±0.001 mm |
| Hole Diameter | ±0.01 mm | ±0.005 mm |
| Thread Tolerance | 6H / 6g | 5H / 5g |
| Surface Roughness | Ra 1.6 µm | Ra 0.8 µm |
| Flatness | 0.02 mm | 0.005 mm |
| Concentricity | 0.02 mm | 0.005 mm |
06 Surface Finishes for Brass Parts
Brass accepts a wide range of surface finishes for both functional and decorative purposes. We offer the following surface treatments:
07 Applications of CNC Machined Brass Parts
Brass machined parts are used across a wide range of industries. At Krsnaye, we regularly produce brass components for the following sectors:
- Electrical terminals & connectors
- Plumbing fittings & valve bodies
- Automotive fluid line fittings
- Sensor housings & enclosures
- Hydraulic & pneumatic fittings
- Gears, bushings & bearings
- Lock components & keys
- Screw machine parts
- Musical instrument hardware
- Medical instrument parts
- Radiator fittings & heat exchangers
- Decorative architectural hardware
- Pipe fittings & compression fittings
- Electronic PCB standoffs & pins
- Precision turned shafts
- Aerospace connectors
08 Design Guidelines for Brass CNC Parts
To get the best results and lowest cost from your brass CNC machined parts, follow these design guidelines:
Wall Thickness
Maintain a minimum wall thickness of 0.5 mm for brass. Walls thinner than 0.5 mm can vibrate or distort during machining. For structural parts, 1.0–1.5 mm is recommended.
Internal Corners & Radii
CNC cutting tools are round, so perfectly sharp internal corners are not possible. Specify an internal corner radius at least equal to the tool radius you expect to be used (typically R0.5 to R1.0 mm minimum). This reduces machining time and tool wear.
Threads
Brass machines excellent threads. Standard metric and imperial threads are produced with high accuracy. For deep threaded holes, maintain a thread depth no more than 3× the hole diameter for best results.
Tolerances
Specify tight tolerances only where functionally necessary. Over-specifying tolerances on non-critical features increases machining time and cost. Our standard tolerance of ±0.01 mm is sufficient for most applications.