Brass stamping uses presses and dies to blank, punch, bend, draw, and form brass sheet or strip into precision components. Brass combines good formability, electrical conductivity, corrosion resistance, and practical mechanical strength, making it useful for terminals, contacts, shielding parts, and other stamped components.
However, different brass grades and tempers do not behave the same during stamping. Alloy composition and material condition affect cutting behavior, springback, drawing capability, and cracking risk. For OEM production, grade and temper should therefore be selected together with part geometry, tooling strategy, and production volume.
Why Brass Properties Matter in Stamping
The properties that make brass useful in industrial products also determine how it behaves under a stamping press. For manufacturing purposes, the important question is not simply what properties brass has, but how those properties affect the forming process.
Ductility and Formability
Good ductility provides more forming margin for bends, flanges, drawn sections, and other features that require plastic deformation. This is one reason suitable brass grades are commonly used for formed electrical and mechanical components.
Formability still depends on alloy composition, temper, thickness, and geometry. A material that performs well during simple bending may not provide enough forming margin for a severe draw or several sequential forming operations.
Strength and Work Hardening
Material strength influences forming force, springback, and cutting behavior. As deformation accumulates, brass can also work-harden and become less tolerant of additional forming.
This becomes important in progressive die stamping. Earlier stations can alter the local material condition before later bends or forming operations are completed, so accumulated deformation around one feature can reduce the forming margin available at subsequent stations.
Electrical Conductivity
Brass provides useful electrical conductivity while generally offering greater mechanical strength than pure copper. This balance makes it suitable for connector terminals, electrical contacts, grounding components, and other conductive stamped parts.
Conductivity alone does not determine whether a component will perform reliably. Contact geometry, surface condition, plating requirements, dimensional consistency, and mechanical retention can be equally important after assembly.
Corrosion Resistance and Surface Condition
Brass provides useful corrosion resistance in many industrial environments and can support a range of surface finishes.
The required alloy should still reflect the actual service environment. Specialized brass compositions may be more appropriate where corrosion resistance is a higher priority than severe cold-forming capability.
Common Brass Grades for Stamping
Brass grades provide different balances of strength, ductility, conductivity, corrosion resistance, and manufacturability. Grade selection should therefore begin with the finished component and required stamping operations rather than with the most familiar alloy name.
| Grade / Designation | System | Primary Characteristic | Stamping Relevance | Typical Applications |
|---|---|---|---|---|
| H62 | Chinese designation | Balanced strength and formability | Blanking, bending and general forming | Hardware, terminals, formed parts |
| H68 | Chinese designation | Good ductility | Forming and drawing | Electrical and formed components |
| C26000 | UNS | High formability | Cold forming and drawing | Terminals, formed electrical parts |
| C36000 | UNS | High machinability | More relevant to machining than severe forming | Machined fittings and connectors |
| C46400 | UNS | Corrosion resistance | Application-dependent stamping | Marine and corrosion-resistant hardware |
H62 and H68 are commonly referenced in Chinese material and stamping standards, while C26000, C36000, and C46400 are UNS designations commonly encountered in North American specifications.
Grades from different designation systems should not be assumed to be direct equivalents based only on nominal copper-zinc content. Chemical composition, temper, mechanical requirements, dimensional requirements, and the applicable material standard should be verified before production.
H62 and H68
The supplied stamping references identify H62 and H68 in bending, drawing, necking, and other forming-related data. They provide useful examples of how brass can support both separation and forming processes.
Material condition remains important. Soft and hard conditions can produce different cutting and forming behavior even when the alloy designation itself does not change.
C26000 Cartridge Brass
C26000 cartridge brass is commonly associated with good ductility and cold-forming capability. This makes it relevant to stamped components that require bends, drawn features, or substantial plastic deformation.
The selected temper remains important. A successful material specification must balance the formability required during stamping with the strength and functional behavior required from the finished part.
Machining and Specialized Brass Grades
Grades such as C36000 illustrate why a common brass alloy is not automatically the best choice for stamping. C36000 is primarily valued for machinability, while severe cold forming places greater emphasis on ductility and forming behavior.
Other specialized alloys may prioritize corrosion resistance or service performance. These properties should be evaluated together with the actual stamping requirements rather than independently.
Why Brass Grade and Temper Must Be Selected Together
Specifying an alloy without considering its material condition can leave an important part of the stamping requirement undefined.
The supplied GB/T 16743-2010 data distinguishes between soft and hard H62 when providing initial blanking-clearance guidance. Soft H62 is listed within a lower shear-strength range, while hard H62 is listed within a substantially higher range.
The manufacturing relationship can be summarized as:
Temper → Strength and Ductility → Stamping Behavior → Tooling Requirements → Part Consistency
A softer condition may provide more forming margin for bending or drawing. A harder condition can provide greater mechanical strength but may also change springback, cutting behavior, and the risk associated with severe deformation.
For OEM production, both alloy and temper should therefore be controlled between material lots.
Practical Material Selection Considerations
| Production Requirement | Material Consideration |
|---|---|
| Severe bending | Sufficient ductility for the required bend geometry |
| Deep drawing | Drawing capability and material condition |
| Higher finished-part strength | Stronger condition balanced against springback and formability |
| Precision blanking | Strength, thickness and appropriate die clearance |
| Electrical contacts | Conductivity balanced with strength and forming behavior |
| High-volume stamping | Consistent alloy, temper and thickness between production lots |
The objective is not to select the softest or strongest brass. It is to establish enough manufacturing margin while still meeting the functional requirements of the finished component.
How Brass Behaves During Stamping
Blanking and Punching
Blanking and punching use a punch and die to separate material from brass sheet or strip. Shear strength, material thickness, die clearance, alignment, and cutting-edge condition all influence the resulting edge.
The supplied GB/T 16743-2010 data provides different initial single-side clearance guidance for soft and hard H62. This demonstrates why a universal clearance percentage should not be applied to every brass grade and temper.
The basic relationship is:
Material Strength → Die Clearance → Fracture Behavior → Burr and Edge Quality
Incorrect clearance can increase burr formation, affect the cut edge, and place unnecessary stress on the tooling. Clearance should therefore be established for the actual material condition and thickness rather than selected from the alloy name alone.
Bending and Springback
Brass generally provides good bending formability. However, the final result depends on temper, thickness, bend radius, tooling geometry, and forming direction or sequence.
A tighter bend increases local deformation around the bend zone. If the available ductility is insufficient, cracking may develop along the highly strained surface.
Springback introduces a different problem. Elastic recovery after unloading can cause the finished bend angle to differ from the tooling angle, so precision parts may require die compensation or an adjusted forming sequence.
If cracking repeatedly appears at the same bend while nearby features remain stable, the local bend geometry and material condition should be reviewed before changing overall press settings.
Deep Drawing
Deep drawing requires the material to flow into a die cavity while maintaining the integrity of the formed wall. It therefore places greater demands on material ductility and process control than simple blanking or bending.
The supplied JB/T 6959-2008 data provides the following limiting drawing coefficients:
| Brass Grade | First Drawing [m1]
|
Subsequent Drawing [mn]
|
|---|---|---|
| H62 | 0.52–0.54 | 0.70–0.72 |
| H68 | 0.50–0.52 | 0.68–0.72 |
The drawing coefficient generally relates the diameter after drawing to the starting blank diameter. Within the referenced conditions, a lower limiting coefficient represents a greater allowable reduction in a drawing operation.
These figures should not be treated as universal design limits. Material condition, part geometry, blank holding, lubrication, tooling, and drawing sequence can all change the practical forming window.
If cracking develops only after several drawing or forming operations, accumulated deformation from earlier stages should be reviewed rather than treating the final operation as the only possible cause.
Tool Support and Necking
The supplied forming data for H62 and H68 also demonstrates how strongly tooling support can influence deformation capability.
| Tool Support | Average Allowable Necking Coefficient |
|---|---|
| No support | 0.65–0.70 |
| External support | 0.50–0.55 |
| Internal and external support | 0.27–0.32 |
For necking, a lower coefficient represents a greater reduction in diameter. Under the referenced conditions, internal and external support therefore allow substantially more severe necking than an unsupported configuration.
The engineering lesson extends beyond necking itself: forming limits are determined by material behavior, geometry, and tooling support together. A material that appears unsuitable under one die condition may behave differently when deformation is better controlled.
Key Process Controls for Precision Brass Stamping
Understanding material behavior explains why defects occur. Production control determines whether those risks remain stable across thousands or millions of stamped parts.
Burr and Tooling Control
Burr height should be monitored throughout production rather than only during initial samples. Cutting-edge wear, punch-to-die alignment, and material variation can change edge quality over time.
If burr height increases progressively during a production run, cutting-edge wear should be investigated before the original die clearance is changed. Changing clearance without identifying wear can treat the symptom rather than the cause.
Progressive Die Control
Progressive dies can integrate punching, blanking, bending, and forming while brass strip advances through multiple stations.
Station sequence matters because deformation introduced upstream can influence downstream operations. Carrier stability, strip positioning, die alignment, and forming sequence therefore contribute to dimensional repeatability.
If several dimensions begin drifting at the same time, strip positioning and die alignment should be checked before compensating individual features independently.
Surface Protection
Brass surfaces can be sensitive to scratching and contamination, particularly when the stamped part will be plated or used as a visible component.
Clean tooling, controlled lubrication, stable strip handling, and suitable part collection help protect the surface. For electrical contacts, surface condition can also affect downstream plating and contact performance.
Common Brass Stamping Defects
| Defect | Likely Mechanism | What to Check First | Engineering Response |
|---|---|---|---|
| Excessive burr | Incorrect clearance or cutting-edge wear | Tool edge and clearance | Service tooling or correct clearance |
| Bend cracking | Insufficient ductility or excessive local strain | Temper and bend geometry | Review material condition and bend radius |
| Springback | Elastic recovery or material variation | Material consistency and geometry | Adjust tooling compensation or forming sequence |
| Drawing cracks | Excessive deformation | Drawing severity and material condition | Review stages and tooling |
| Wrinkling | Insufficient restraint | Blank holding and die support | Optimize material control |
| Surface scratches | Tool contamination or handling | Tool surface and strip path | Improve cleaning and handling |
Defect correction should begin with the likely failure mechanism. Increasing press force, changing clearance, or compensating dimensions without identifying the underlying cause can introduce a second process problem while leaving the first unresolved.
Applications of Brass Stamping
Brass stamping is especially useful where conductivity, formability, mechanical retention, and repeatable geometry must coexist.
Connector Terminals and Electrical Contacts
Brass is commonly used for stamped terminals and electrical contacts because it balances electrical performance with the strength needed to retain formed features.
These components may include small holes, contact areas, locking features, tabs, and multiple bends. Burr control and dimensional consistency become particularly important where stamped features interact directly with plastic connector housings or mating contacts.
Grounding Clips and EMI Shielding Components
Conductive clips, grounding hardware, and certain EMI shielding components can also be produced from brass strip.
Thin material and small formed features make tooling stability especially important for stamped clips and other compact conductive components. Variations in bend position, flatness, or feature geometry can influence both assembly and electrical contact.
Automotive Electrical Components
Automotive connector hardware, terminals, and sensor-related contacts often require high-volume production with consistent geometry.
Progressive stamping can support these quantities when material condition, strip layout, tooling sequence, and inspection requirements are established around the actual part design.
Brass can also be used for other industrial and appliance clips, contacts, brackets, and formed hardware where its combination of conductivity, corrosion resistance, and formability matches the application.
How to Select Brass for a Stamped Part
Material selection should begin with the component rather than a list of available brass grades.
Define the Part Requirements
Determine the required conductivity, mechanical strength, corrosion resistance, surface condition, and operating environment.
Match Geometry to Forming Severity
Review bends, bend radii, holes, flanges, drawn sections, and other features that determine how much deformation the material must tolerate.
A blanked flat component does not impose the same material requirements as a terminal with several bends or a deeply drawn part.
Select Grade and Temper Together
Choose the alloy for its required property balance, then select a temper that provides sufficient manufacturing margin without sacrificing finished-part performance.
Include Finishing and Assembly Requirements
Deburring, cleaning, plating, and assembly may change the required edge and surface conditions. Electrical parts may also require specific contact surfaces or plated areas.
Validate Before Volume Production
Sample production should verify dimensions, edge quality, forming behavior, surface condition, and assembly fit before full-scale production.
This sequence reduces the risk of choosing a material because one property looks favorable while overlooking the behavior of the complete manufacturing process.
Brass Stamping for High-Volume OEM Production
Brass is well suited to high-volume precision metal stamping when the component design supports repeatable strip-fed production.
Progressive dies can combine several operations while reducing manual handling between manufacturing stages. The economic result, however, depends on more than press speed or raw brass price.
A more complete cost relationship is:
Material Price + Strip Utilization + Scrap + Tooling Life + Cycle Rate + Secondary Operations → Finished-Part Cost
For relatively valuable copper alloys, strip layout and material utilization can have a meaningful effect on unit cost. A material or tooling strategy that reduces forming failures, scrap, or secondary processing can therefore be more economical even when the initial material price is not the lowest.
For custom stamping projects, tqstamping evaluates grade, temper, part geometry, tooling strategy, and production volume together. The objective is to establish dimensional and process stability that can be maintained throughout volume production rather than demonstrated only during initial samples.
Brass Stamping FAQ
What brass grade is best for stamping?
There is no single best brass grade for every stamped component. Selection depends on forming severity, required strength, conductivity, corrosion resistance, geometry, and material condition.
Is C26000 brass suitable for deep drawing?
C26000 is known for good ductility and formability, making it relevant to deep drawing and other cold-forming applications. Final suitability depends on temper, thickness, part geometry, drawing severity, and tooling conditions.
How does brass temper affect stamping?
Temper changes the strength and ductility of brass. These changes can influence cutting behavior, bend cracking, springback, drawing capability, and the required tooling strategy.
What is the difference between H62 and C26000 brass for stamping?
H62 and C26000 belong to different material designation systems and should not be treated as direct equivalents without verification. The applicable standard, composition, temper, mechanical properties, and stamping requirements should be compared before material substitution.
How should brass stamping clearance be selected?
Clearance should consider material thickness, strength or temper, tooling design, and required edge quality. The referenced GB/T 16743-2010 data, for example, distinguishes between soft and hard H62 when providing initial clearance guidance.
Can brass be used in progressive die stamping?
Yes. Brass can be progressively stamped into high-volume terminals, contacts, clips, and other precision components when material condition, strip layout, die design, and forming sequence are matched to the part.
Conclusion
Reliable brass stamping depends on the relationship between grade, temper, part geometry, tooling, and process control rather than on alloy selection alone.
Material condition influences cutting, bending, springback, and drawing behavior. Die condition affects burrs and repeatability, while tooling support and forming sequence can determine whether more demanding features remain stable during production.
For OEM programs, material selection should therefore be completed together with tooling and process planning. Matching the brass grade and temper to the actual stamping requirements provides a stronger foundation for dimensional consistency, controlled production costs, and reliable high-volume manufacturing.
