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3, 4, 5-Axis Precision Machining
10
2026
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C36000 H02 Brass CNC Machining: DFM for Turned Parts
Author:
SINDH Machining
A brass component can quote quickly yet fail later because the purchase order said only “brass,” the design assumed a lead-free composition, or a plated bore was accepted before coating. Another part may have excellent surface appearance but lose alignment when a deep internal cavity removes most of the starting section.
That is why C36000 brass CNC machining begins with material identity and function rather than a machinability percentage. This guide separates public material knowledge from project-specific SINDH capability. It does not claim that SINDH stocks C36000, supplies every finish, or can satisfy an unstated regulatory requirement.
Specify Alloy, Temper, Form and End Use Together
The Copper Development Association identifies C36000 as a wrought copper-zinc-lead alloy with 60–63 percent copper, 2.5–3.0 percent lead, zinc as the remainder, and up to 0.35 percent iron. ASTM B16/B16M covers C36000 rod, bar, wire and shapes for screw-machine applications and moderate thread rolling. H02 is the half-hard temper normally associated with this product family, but the purchase order should still state it.
Form and section matter. A cold-drawn round rod, a hex bar and a large extruded shape do not share one universal mechanical-property value. The governing standard assigns requirements by form, temper and size. A supplier certificate should identify the delivered material; a generic website table should not replace incoming evidence where the project requires it.
| Part feature or buyer question | Potential impact or risk | Drawing, RFQ or evidence to define |
|---|---|---|
| Material note says only “brass” or “C360” | Wrong alloy, temper, lead content, stock condition or certificate basis | UNS C36000, H02, product form, governing standard, size, certificate and substitution rule |
| Deep bore through a slender turned body | Drill wander, heat, chip packing, wall imbalance or concentricity loss | Bore depth, datum axis, wall map, tool access, breakthrough, runout and inspection method |
| Small external or internal detail | Burrs, rolled edges, damage during handling or ambiguous thread acceptance | Feature standard, gauges, edge condition, protected surfaces and sampling plan |
| Nickel, tin or other plating requested | Buildup changes bores, shoulders, threads, electrical contact or appearance | Finish specification, thickness/allowance, masking, rack/contact area and final inspection state |
| Water, food or regulated-market contact | C36000 lead content may conflict with end-use rules | Market, media, contact condition, governing regulation, customer specification and approved alternative |
| Cosmetic face also used as a datum | Polishing or plating can alter flatness, texture and measurement | Functional priority, permitted process, protection, pre/post-finish dimensions and evidence |
Hardness and Strength Need the Correct Context
The CDA database reports C36000 properties by product form, H02 temper and section size at 20°C. Published Rockwell B values vary across those conditions, and ASTM requirements likewise depend on product dimensions. This is the practical lesson: do not put a single copied hardness number on every C36000 drawing. State the material specification and product condition, then add hardness only when it is functionally required and measured by an agreed method.
Hardness is not machinability, tensile strength, wear life or thread performance. Lead assists chip breaking and reduces tool–chip friction, but geometry still governs stability. A thin cross-hole wall, interrupted cut, long tool reach or delicate edge can remain difficult even in a free-cutting alloy.
Machining Risks Behind a “Free-Cutting” Label
Short chips help production, not every feature
C36000 is used as a machinability reference because it generally forms manageable chips. That can support efficient turning, drilling and threading, but it does not remove the need for sharp tooling, suitable geometry, chip evacuation and stable workholding. Deep holes can still pack chips; tiny exits can raise burrs; interrupted faces can mark; and an excessively aggressive finish pass can move a slender wall.
Concentric features depend on datum continuity
Adapters and bushings often combine an outside diameter, one or more bores, shoulders, grooves and side features. When these surfaces function from one axis, machining and inspection should preserve that relationship. Rechucking may be necessary, but each transfer creates another datum decision. Define whether acceptance is diameter size, circular runout, total runout, coaxial location or a functional gauge result; those controls answer different questions.
Thin sections and asymmetric stock removal can move
Free-machining does not mean zero residual stress or zero distortion. A deep cavity in a hex body, an off-center port, a long slot or a thin flange changes stiffness. The process may need balanced roughing, staged finishing, soft support or a released-state check. Blanket tolerances are a poor substitute for identifying the features that actually locate, seal, conduct or assemble.
Four Decisions for a Reliable Brass Part
Material control
Engineering and purchasing approve UNS alloy, temper, product form, standard, certificate, lead restrictions and substitution rule.
Geometry control
Design identifies datum axes, critical bores, shoulders, thin walls, cross holes, edges and finish allowances.
Process control
Manufacturing confirms workholding, tool access, chip removal, setup transfer, deburring, cleaning and finishing sequence.
Evidence control
Quality agrees material evidence, gauges, first-piece scope, in-process checks, final state, sampling and reports.
Plating, Masking and Final Dimensions
Nickel, tin, silver or another finish may be considered for appearance, corrosion, wear, solderability or electrical contact, but no process should be assumed available or suitable. Each finish has its own preparation, buildup, coverage, adhesion and environmental limits. Select it with the approved finishing source and system designer.
Plating can reduce a bore, enlarge an outside diameter, alter a thread, soften an edge and change surface texture. Masking may preserve size but expose base metal or create a boundary ridge. The drawing should specify whether dimensions apply before or after finish, the approved thickness or allowance, masked zones, rack/contact areas, appearance standard and post-finish inspection. A polished cosmetic surface also needs a limit on material removal where it is functional.
C36000 H02 Drawing and RFQ Checklist
- Specify UNS C36000, H02, rod/bar/shape, governing standard and certificate.
- State market, media contact, lead restriction, regulatory and customer requirements.
- Send revision-matched 2D drawing and 3D model with document precedence.
- Identify primary datum axis, locating faces, bores, shoulders and mating components.
- Define deep-hole access, cross-hole intersections, breakthrough and burr requirements.
- Mark thin walls, interrupted cuts, critical edge conditions and cosmetic zones.
- Specify finish, thickness or allowance, masking, contact points and final inspection state.
- Define gauges, first-piece, in-process, CMM/full-dimensional and material evidence.
- Provide realistic prototype and quantity tiers, repeat-release plan and change control.
- State packaging, destination and schedule objective without assuming fixed production time.
How SINDH Reviews the Drawing
SINDH Machining provides engineering-led DFM for complex metal and high-performance engineering-plastic parts from prototypes through stable low-volume and repeat production. Review can address multi-face relationships, thin walls, deep cavities, tool and measurement access, distortion, burrs, datum strategy and inspection. CNC milling, turning, 3-axis, 4-axis, 5-axis and turn-mill routes may be discussed according to the approved drawing.
First-piece, in-process and CMM inspection are supported. Material certificates and full-dimensional reports can be provided when agreed. C36000 H02 stock, surface treatment, compliance, exact tolerance, equipment, report and production timing require project confirmation. SINDH’s ISO 9001:2015-certified quality management system supports documented processes, inspection, calibration, corrective action and continual improvement; conformity is still verified against the approved drawing, specification and inspection plan.
Frequently Asked Questions
Is C36000 H02 the same as every grade called free-machining brass?
No. Specify the UNS alloy, temper, governing product standard, stock form, size, certificate and permitted substitutions. Similar trade names or regional designations are not automatically interchangeable.
What hardness should I specify for C36000 H02 brass?
Use the governing material specification and applicable product size, form and temper. Published Rockwell B values vary with section and source; do not copy one web value as a universal drawing limit.
Does C36000 automatically comply with drinking-water or environmental rules?
No. C36000 is a leaded brass. The buyer must identify the market, end use, media contact and applicable regulatory or customer requirements, then approve the alloy or a qualified alternative.
Can a plated C36000 part be inspected before plating?
Pre-plate inspection can control the machined base part, but final fit and critical surfaces may require post-plate verification. Define coating system, thickness or allowance, masking, threads, bores, datums and final acceptance state.
What should I send for a C36000 brass machining quotation?
Send controlled 2D and 3D files, C36000 H02 and stock form, governing specification, critical features, finish and masking, quantities, compliance and certificate needs, inspection requirements, destination and schedule objective.
Review C36000 Requirements Before Production
Send controlled 2D and 3D files, C36000 H02 and stock form, governing specification, critical datums and fits, finish and masking, quantity tiers, certificate and inspection needs, destination and schedule objective.
If you are looking for a suitable industry solution, please contact us. We will provide better solutions.
Sindh Technology (Suzhou)Co.,Ltd
Add: No.1 Houxiang Road, Wuzhong District, 215128, Suzhou, China.
E-mail: info@sindhmachining.com
WhatsApp（Phone）: 0086 13537796958
Tel: 0086 (0512) 85860000
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