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CNC Stamped Copper C11000 Grounding Terminal with 200A to 2000A Current Rating and +/-0.1mm Hole Pattern Accuracy

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CNC Stamped Copper C11000 Grounding Terminal with 200A to 2000A Current Rating and +/-0.1mm Hole Pattern Accuracy

Detail Information

Product Description

Detail Information

Material:

Copper C11000 (ETP)

Thickness:

2mm To 6mm

Current Rating:

200A To 2000A

Hole Position Tolerance:

+/-0.1mm

Plating Thickness:

3-8um

Conductivity:

101% IACS Minimum

Product Description

CNC Stamped Copper Grounding Terminal for Power Systems

A grounding terminal is the kind of component that nobody thinks about until something goes wrong. It sits in a switchgear panel, in a transformer enclosure, or at the base of a lightning protection mast. It carries the current that's supposed to protect everything else — and if it fails, the consequences aren't measured in warranty returns. They're measured in equipment fires, arc flash incidents, and safety violations that shut down a factory.

Copper C11000 (ETP copper) is the standard material for grounding terminals, and for good reason. Its electrical conductivity (101% IACS minimum) means it carries fault current with minimal voltage drop. Its thermal conductivity means it dissipates heat generated during fault events before the terminal itself becomes the failure point. And it's available in the sheet thicknesses that stamping operations require — typically 2mm to 6mm for grounding terminals rated 200A to 2000A.

The stamping challenge on grounding terminals is the hole pattern. A typical grounding terminal has 6 to 12 bolt holes, some of which are clearance holes for M8 or M10 grounding bolts and others are tap holes for mounting studs. The clearance holes need to be positioned within ±0.1mm because the bolt spacing on the grounding bus they connect to is fixed. The tap holes need clean threads — copper taps poorly if the thread depth exceeds 1.5x the diameter without proper tooling and peck cycle.

We've been stamping and machining copper electrical components for years. The process for grounding terminals combines stamping (for the flat terminal body) with secondary CNC operations (for tapped holes, countersinks, and edge finishing). This hybrid approach gives us the speed of stamping for high-volume blanks with the precision of CNC for the critical connection features.

Key Features

Material: Copper C11000 (ETP) per ASTM B152, with minimum 101% IACS conductivity and full MTR
Current Rating: 200A to 2000A depending on terminal size and cross-section
Hole Pattern Accuracy: Bolt hole positions within ±0.1mm of drawing specification
Thread Quality: Tapped holes with Class 2B tolerance, verified with go/no-go gauges
Surface Finish: Bright finish or tin-plated for corrosion protection in outdoor installations
Edge Quality: Deburred edges with no sharp burrs — important for worker safety during installation

Technical Specifications

Specification	Details
Product Name	CNC Stamped Copper Grounding Terminal for Power Systems
Material Options	Cu C11000 (ETP), Cu C10200 (OFHC), Cu C10100 (OFE)
Thickness	2mm to 6mm standard, up to 10mm for high-current applications
Tolerance	±0.1mm (hole position), ±0.05mm (hole diameter), ±0.2mm (outline)
Surface Treatment	Tin plating (3-8um), silver plating, or as-stamped bright finish
Plating Standard	IPC-6012 Class 2 or 3, thickness verified by XRF
Current Rating	200A (2mm), 500A (3mm), 1000A (5mm), 2000A (6mm+)
Certifications	ISO 9001:2015, IATF 16949, RoHS, CE
Lead Time - Prototype	5-7 days
Lead Time - Production	7-12 days (100-1000 pcs), 12-20 days (1000-10000 pcs)
MOQ	20 pieces (prototype), 100+ (production)
Origin	Dongguan, China

Applications

Switchgear & Distribution Panels: Main grounding terminals and equipment grounding bus connections in low-voltage and medium-voltage switchgear assemblies
Transformer Installations: Grounding terminals for transformer enclosures, core grounding, and neutral-to-ground connections
Lightning Protection Systems: Down conductor grounding terminals at the base of lightning protection masts and air terminals
Solar Power Systems: Grounding terminals for solar panel arrays, inverter grounding, and combiner box ground connections
EV Charging Stations: Grounding terminals and equipotential bonding connectors in DC and AC charging infrastructure
Industrial Equipment: Equipment grounding terminals for motors, generators, CNC machines, and industrial automation panels

Why Choose Sinbo Precision

Copper Stamping Expertise: Copper behaves differently from steel in a stamping die — it's softer, more ductile, and the springback is different. Our stamping dies and process parameters are tuned for copper, not adapted from steel stamping experience
Hybrid Process: We combine stamping (fast blank production) with CNC secondary operations (precise tapped holes and countersinks). For volume runs, this is significantly more cost-effective than CNC-machining the entire terminal from solid copper bar
Tin Plating Management: For outdoor grounding applications, tin plating prevents copper oxidation that increases contact resistance over time. We verify plating thickness with XRF and ensure consistent coverage on all surfaces including hole walls
Thread Quality on Copper: Tapping copper is one of the more frustrating machining operations — the material grabs the tap, chips don't break cleanly, and thread quality suffers. We use optimized tap geometry, controlled peck cycles, and thread-forming taps where appropriate
Volume Capability: For grounding terminal production runs of 100-10,000+ pieces, our stamping tooling and secondary operations lines are set up for consistent output with SPC monitoring

Manufacturing Process

Design Review: Analyze terminal drawing for stamping feasibility — hole sizes relative to material thickness, bend radii (if any), and feature orientation relative to grain direction
Material Procurement: C11000 copper sheet per ASTM B152, certified for chemical composition and electrical conductivity
Blanking & Stamping: Precision stamping to form the terminal body outline, flat pattern, and through-holes. Progressive die for high-volume orders
Deburring: Automated deburring to remove all stamping burrs. Critical for grounding terminals — sharp edges are a safety hazard during installation
Secondary CNC Operations: Tapped holes, countersinks, chamfers, and edge finishing on CNC machining centers. Thread gauging on every piece
Surface Treatment: Tin plating (3-8um) for corrosion protection or silver plating for high-current-low-resistance applications. Plating thickness verified with XRF
Inspection & Packaging: Hole pattern verification with CMM, thread gauge verification, plating thickness check, visual inspection for surface defects. Packaged in anti-tarnish bags

Frequently Asked Questions

Q: Why use C11000 instead of C10200 for grounding terminals?

A: C11000 (ETP copper) is the most cost-effective option for grounding terminals and has excellent conductivity (101% IACS minimum). C10200 (OFHC copper) is oxygen-free, which matters for vacuum tube and semiconductor applications but adds cost with no benefit for grounding. For standard grounding applications, C11000 is the correct choice.

Q: Do you recommend tin plating for outdoor grounding terminals?

A: Yes, absolutely. Bare copper oxidizes in outdoor environments, forming a copper oxide layer that increases contact resistance over time. Tin plating (3-8um) prevents oxidation and maintains low-contact-resistance connections for the terminal's service life. For indoor applications in dry environments, bare copper is acceptable.

Q: What's the maximum current rating you can produce?

A: For stamped terminals, 2000A is practical with 6-8mm copper thickness. Above that, you're looking at machined solid bar terminals or brazed assemblies — we can produce those too, but the process and pricing are different.

Q: Can you add mounting studs instead of tapped holes?

A: Yes. We can press-fit or brazed-mount copper studs onto the terminal body. Press-fit studs are faster and cheaper for volume; brazed studs are stronger for high-vibration applications. We'll recommend the best approach based on your installation environment.

Q: Do you provide UL or CSA certification on grounding terminals?

A: The terminal itself is a mechanical/electrical component. UL listing applies to the complete assembly (switchgear, panel, etc.) that uses the terminal. We can manufacture terminals that meet the material, dimensional, and plating requirements of UL 467 (Grounding and Bonding Equipment) specifications.

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products details

CNC Mechanical Parts

CNC Turning Parts

CNC Milling Parts

CNC Machining Services

Cold Forging Parts

CNC Turning Milling Parts

CNC Aluminum Parts

CNC Stainless Steel Parts

CNC Brass Parts

CNC Stamping Parts

Machining Plastic Parts

Bending Sheet Metal Parts

New Energy Auto Parts

Energy Storage Connectors

Contactor Terminal

Battery Terminal Connector

CNC Manufacturing Solutions

CNC Stamped Copper C11000 Grounding Terminal with 200A to 2000A Current Rating and +/-0.1mm Hole Pattern Accuracy