Connection Holes: Burr Height ≤ 0.1mm maximum

Component Specifications

Definition

Connection holes are precisely engineered apertures in electrical busbars designed to facilitate reliable electrical connections through bolted or clamped interfaces. These holes maintain proper alignment, ensure uniform contact pressure, and provide mechanical stability while accommodating thermal expansion and electrical load variations in power distribution applications.

Working Principle

Connection holes enable electrical continuity by providing mounting points for conductors, allowing current to flow through bolted or clamped connections while maintaining mechanical integrity through precise hole positioning and sizing that distributes stress evenly across the busbar surface.

Materials

Typically match busbar material: Copper (C11000, C10100), Aluminum (6061, 6101), or copper-aluminum composites; may include plating (tin, silver, nickel) for corrosion resistance and improved conductivity.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Burr Height	≤ 0.1mm maximum
Edge Distance	Minimum 1.5× hole diameter from busbar edge
Hole Diameter	M6-M20 (standard metric) or 1/4"-3/4" (imperial)
Hole Tolerance	±0.1mm for precision applications
Pitch Distance	2.5-3× hole diameter between centers
Surface Finish	Ra ≤ 3.2μm for optimal contact

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

Standards

ISO 12944-5, DIN 43673, IEC 61439-1, ASTM B187

Parent Products

This component is used in the following industrial products

Connection Busbars

Conductive metal bars used to interconnect components within a power capacitor bank.

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Engineering Analysis

Risks & Mitigation

Improper hole alignment causing uneven contact pressure
Burrs creating electrical hotspots
Insufficient edge distance leading to material fatigue
Corrosion at connection points reducing conductivity
Thermal expansion mismatch causing joint loosening

FMEA Triads

Trigger: Inaccurate hole positioning during manufacturing
Failure: Misaligned connections leading to uneven current distribution and localized overheating
Mitigation: Implement precision CNC drilling with optical alignment verification and regular tool calibration

Trigger: Inadequate deburring after hole creation
Failure: Sharp edges creating electrical field concentration and corona discharge
Mitigation: Automated deburring processes with post-inspection using magnification tools

Trigger: Corrosion due to dissimilar metals or environmental exposure
Failure: Increased contact resistance leading to voltage drop and thermal runaway
Mitigation: Apply appropriate plating (tin, silver, nickel) and use corrosion-inhibiting compounds at connections

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Hole diameter: H12 tolerance per ISO 286, Position tolerance: ±0.2mm maximum deviation

Test Method

Coordinate measuring machine (CMM) verification, go/no-go gauge testing, thermal cycling tests per IEC 61439-1, contact resistance measurement using micro-ohmmeter

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 Connection Holes

Manufacturer profiles associated with Connection Holes.

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Frequently Asked Questions

What is the primary purpose of connection holes in busbars?

Connection holes provide secure mounting points for electrical conductors, ensuring reliable current transfer through bolted or clamped connections while maintaining mechanical stability and proper alignment in power distribution systems.

How are connection holes typically manufactured?

Connection holes are precision-drilled using CNC machining, laser cutting, or punching processes, followed by deburring and surface finishing to ensure smooth edges, proper dimensions, and optimal electrical contact surfaces.

What factors determine connection hole spacing and size?

Hole size and spacing are determined by bolt diameter, electrical current capacity, mechanical load requirements, thermal expansion considerations, and applicable standards like DIN 43673 or IEC 61439 for safety and performance.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Connection Holes