Contact Surface: Hardness 80-100 HRB

Q: Why is contact surface important in grounding clamps?

It ensures low resistance for fault current path, preventing overheating and ensuring safety.

Q: What materials are used for contact surfaces?

Copper alloys, brass, or steel with tin/silver plating for corrosion resistance.

Component Specifications

Definition

The contact surface is the critical interface of a grounding clamp that directly contacts the workpiece or ground rod. It is designed to provide a low-impedance path for fault currents, ensuring safety and equipment protection. The surface must be clean, flat, and free of oxidation to maintain reliable electrical continuity.

Working Principle

The contact surface works by pressing firmly against a conductive material (e.g., copper, steel) to create a metal-to-metal junction. High contact pressure breaks through surface oxides, reducing contact resistance. The large surface area distributes current evenly, minimizing heating and voltage drop.

Materials

High-conductivity copper alloy (e.g., C11000) or brass, often tin-plated or silver-plated to resist corrosion. Steel with zinc or nickel plating for cost-sensitive applications.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Hardness	80-100 HRB
Plating Thickness	5-10 μm (tin) or 2-5 μm (silver)
Surface Roughness	Ra ≤ 3.2 μm
Contact Resistance	< 0.1 mΩ

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

IEC 61230, UL 467, DIN VDE 0683

Parent Products

This component is used in the following industrial products

Grounding Clamps

Electrical connectors used to establish a secure, low-resistance connection between grounding conductors and grounding electrodes or other grounded objects.

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Engineering Analysis

Risks & Mitigation

Oxidation increasing contact resistance
Surface contamination causing poor connection
Mechanical wear reducing clamping force

FMEA Triads

Trigger: Oxidation or corrosion
Failure: Increased contact resistance leading to overheating
Mitigation: Use plated surfaces and periodic cleaning

Trigger: Insufficient clamping force
Failure: High resistance and arcing
Mitigation: Design for adequate spring pressure and torque specifications

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Contact resistance ≤ 0.1 mΩ per UL 467

Test Method

Micro-ohmmeter measurement per IEC 61230

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Contact Surface

1 company lists this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

DEGSON

Zhejiang, CN

Also makes: Feed-through Terminal Blocks, Power Distribution Module, Power Distribution and 9 more

Listed on the company's own website · profile compiled by CNFX from public sources

Listed there as: “Metal Part,Contact surface:Tin”
View source page ↗ degson.com · checked 2026-08-26

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Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

Related Components

Polymer Coating

Polymer coating is a protective layer applied to steel sheets through powder coating processes to enhance durability, corrosion resistance, and aesthetic appearance.

Frequently Asked Questions

Why is contact surface important in grounding clamps?