Friction Plates/Discs: Torque Capacity 10-5000 Nm

Component Specifications

Definition

Friction plates/discs are precision-engineered components within torque limiting clutches designed to transmit torque through controlled frictional contact between mating surfaces. They consist of alternating friction and separator plates that engage under pressure, creating a frictional force proportional to the applied load. When torque exceeds a preset threshold, these plates slip relative to each other, limiting torque transmission to protect downstream machinery from overload damage. Their design incorporates specific friction coefficients, thermal stability, and wear resistance to ensure consistent performance across operating cycles.

Working Principle

Friction plates/discs operate on the principle of controlled frictional engagement. When axial force is applied (typically via springs or hydraulic pressure), friction plates press against separator plates, creating frictional torque transmission. The torque capacity is determined by the friction coefficient, number of plates, effective radius, and applied force. When transmitted torque exceeds the clutch's preset limit, the plates slip, dissipating energy as heat while maintaining torque at the safe threshold. This slip action provides overload protection without mechanical disconnection.

Materials

Friction plates: Sintered metal (copper/iron-based), paper-based composites, ceramic-metallic compounds, or organic materials with friction modifiers. Separator plates: Steel (SAE 1045/1070), hardened and ground for flatness, often with phosphate coating or other surface treatments to prevent galling.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Thickness	1.5-5 mm
Inner Diameter	25-150 mm
Outer Diameter	50-300 mm
Pressure Rating	0.5-3.0 MPa
Torque Capacity	10-5000 Nm
Friction Coefficient	0.08-0.15 (dry), 0.10-0.18 (wet)
Operating Temperature	-40°C to 250°C

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 1219-1, DIN 15435, SAE J1479

Parent Products

This component is used in the following industrial products

Torque Limiting Clutch

A mechanical safety device that automatically disengages or slips when torque exceeds a preset limit to protect machinery from overload damage.

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Engineering Analysis

Risks & Mitigation

Overheating from prolonged slippage
Contamination reducing friction coefficient
Uneven wear causing vibration
Material degradation at high temperatures
Incorrect installation leading to premature failure

FMEA Triads

Trigger: Insufficient cooling system capacity
Failure: Thermal degradation of friction material
Mitigation: Implement temperature monitoring, improve cooling design, use high-temperature rated materials

Trigger: Contaminant ingress (oil, particulate)
Failure: Reduced friction coefficient causing slippage below torque threshold
Mitigation: Improve sealing, implement filtration, use contamination-resistant materials

Trigger: Uneven pressure distribution
Failure: Localized overheating and warping
Mitigation: Ensure proper plate flatness, use pressure equalizing designs, verify installation alignment

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Thickness tolerance ±0.05 mm, flatness ≤0.02 mm, parallelism ≤0.01 mm

Test Method

Torque testing per ISO 1219-1, friction coefficient measurement per SAE J1479, wear testing under controlled slip conditions

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

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Manufacturers of Friction Plates/Discs

Manufacturer profiles associated with Friction Plates/Discs.

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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

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Frequently Asked Questions

What causes premature wear in friction plates?

Premature wear typically results from excessive slippage, contamination (oil, dust), improper alignment, insufficient cooling, or using plates beyond their rated temperature/pressure limits.

How do I select the right friction material?

Selection depends on application: sintered metal for high thermal capacity, paper-based for smooth engagement in wet clutches, ceramic-metallic for extreme conditions, and organic materials for noise-sensitive applications.

Can friction plates be reconditioned?

No, friction plates are wear components designed for replacement. Attempting to resurface them alters thickness and friction characteristics, compromising clutch performance and safety.

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.

Friction Plates/Discs