Clamping Screw: Temperature Range -40°C to +120°C

Component Specifications

Definition

A clamping screw is a critical fastening component in industrial power connector terminal blocks, designed to mechanically secure electrical conductors (wires or busbars) within the terminal block's housing. It applies controlled compressive force to establish and maintain a low-resistance electrical connection while preventing conductor loosening due to vibration, thermal cycling, or mechanical stress. These screws are engineered for high torque transmission, corrosion resistance, and compatibility with various conductor types and sizes in industrial electrical systems.

Working Principle

The clamping screw operates on the mechanical principle of torque-to-clamp force conversion. When tightened with a calibrated tool, the screw thread engages with the terminal block's internal threading, generating axial force that presses a clamping plate or mechanism against the electrical conductor. This creates a secure mechanical grip and establishes electrical continuity by maximizing surface contact area between conductor and terminal, minimizing contact resistance and preventing arcing or overheating.

Materials

Typically made from high-strength steel alloys (e.g., 8.8 or 12.9 grade steel) with zinc plating or dichromate coating for corrosion resistance. Premium versions may use stainless steel (A2/A4-70/A4-80) for harsh environments, or brass/copper alloys for enhanced electrical conductivity in critical applications.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Head Type	Hex socket (Allen), slotted, or Phillips
Thread Type	Metric (e.g., M4, M5, M6)
Torque Range	1.2-10 Nm (depending on size)
Clamping Force	500-5000 N
Conductor Range	0.5-35 mm² (wire) or up to 10 mm thickness (busbar)
Temperature Range	-40°C to +120°C
Corrosion Protection	Salt spray test ≥ 96 hours

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 898-1, DIN 912, IEC 60947-7-1

Parent Products

This component is used in the following industrial products

Industrial Power Connector Terminal Block

Modular electrical connection component for secure power distribution in industrial wiring systems.

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Slit Clamping Mechanism

A mechanical component within a slit mount/housing that securely holds and positions optical or mechanical slits.

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Engineering Analysis

Risks & Mitigation

Over-torquing causing thread/strip damage
Under-torquing leading to loose connections and overheating
Corrosion in humid/chemical environments
Galvanic corrosion with dissimilar metals

FMEA Triads

Trigger: Incorrect torque application during installation
Failure: Loose connection leading to increased resistance, overheating, and potential fire hazard
Mitigation: Use calibrated torque tools and follow manufacturer specifications; implement torque verification procedures

Trigger: Material fatigue from repeated thermal cycling
Failure: Screw fracture or loss of clamping force
Mitigation: Select materials with appropriate thermal expansion coefficients; implement preventive maintenance schedules

Trigger: Corrosive environment exposure
Failure: Thread degradation and seizure, preventing maintenance
Mitigation: Use corrosion-resistant coatings/materials; specify environmental protection levels (IP ratings)

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Thread tolerance: 6g per ISO 965-1; dimensional tolerance per DIN 912

Test Method

Torque-to-failure testing per ISO 898-1; salt spray corrosion testing per ISO 9227; electrical continuity testing per IEC 60947-7-1

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 Clamping Screw

Manufacturer profiles associated with Clamping Screw.

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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

Terminal Base

A terminal base is an insulating support structure that holds and organizes electrical terminals in motor terminal blocks, providing secure connections and circuit management.

Contact Plate

A conductive plate in motor terminal blocks that establishes electrical contact between conductors.

Marking Strip

A durable marking strip used for terminal identification in motor terminal blocks to ensure proper electrical connections and safety compliance.

Gland Body

A gland body is the main housing component of an aluminum cable gland that provides mechanical protection and environmental sealing for electrical cables entering enclosures.

Frequently Asked Questions

What is the main function of a clamping screw in a terminal block?

To securely fasten electrical conductors, ensuring stable electrical connections and preventing loosening from vibration or thermal expansion.

How do I select the right clamping screw for my application?

Consider conductor size/material, required torque, environmental conditions (corrosion, temperature), and compliance with standards like IEC 60947.

Can clamping screws be reused?

Limited reuse is possible if undamaged, but repeated tightening may reduce clamping force; follow manufacturer guidelines for critical applications.

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.

Clamping Screw