Friction plates: Inner Diameter 50-200mm, Thickness 2.0-5.0mm

Component Specifications

Definition

Friction plates are disc-shaped components within clutch assemblies that create controlled frictional engagement between rotating members. They consist of a steel core plate with bonded friction material on one or both surfaces, designed to withstand high thermal and mechanical loads during engagement cycles. These plates alternate with separator plates in clutch packs to transmit torque when compressed by hydraulic or mechanical pressure.

Working Principle

Friction plates operate on the principle of dry or wet friction engagement. When hydraulic pressure or mechanical force compresses the clutch pack, friction surfaces contact separator plates, creating torque transfer through frictional resistance. The friction material's coefficient of friction determines engagement characteristics, while grooves in the material facilitate fluid flow and heat dissipation in wet clutch applications.

Materials

Steel core (SAE 1010-1020) with bonded friction material (paper-based, carbon, sintered bronze, or ceramic composites). Friction material thickness: 0.8-2.0mm. Core plate thickness: 1.5-3.0mm with heat treatment to 45-50 HRC.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Thickness	2.0-5.0mm
Inner Diameter	50-200mm
Outer Diameter	80-300mm
Pressure Rating	1.5-4.0 MPa
Maximum Temperature	250-350°C
Friction Coefficient	0.10-0.15 (wet), 0.30-0.45 (dry)

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 15407, DIN 15407, SAE J2489

Parent Products

This component is used in the following industrial products

Clutch Pack

A multi-plate friction assembly within an automatic transmission that engages and disengages power flow between rotating components.

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Engineering Analysis

Risks & Mitigation

Thermal degradation of friction material
Glazing from overheating
Delamination of bonded material
Warpage from uneven heating
Contamination from fluid breakdown

FMEA Triads

Trigger: Insufficient cooling fluid flow
Failure: Thermal cracking and material degradation
Mitigation: Implement temperature sensors and flow monitoring; optimize groove design for better fluid distribution

Trigger: Excessive clutch engagement pressure
Failure: Plate warpage and premature wear
Mitigation: Calibrate hydraulic pressure controls; install pressure relief valves; use reinforced core plates

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.05mm thickness, ±0.1mm diameter, flatness within 0.03mm

Test Method

SAE J2489 friction testing, ISO 15407 thermal cycling, DIN 15407 wear resistance testing

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

Manufacturer profiles associated with Friction plates.

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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

Clutch Disc

A clutch disc is a friction component in clutch-brake systems that engages and disengages power transmission between rotating shafts.

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Brake Disc (Rotor)

A rotating disc in disc brake systems that creates friction with brake pads to slow or stop vehicle motion.

Main Bearing Journals

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Frequently Asked Questions

What is the difference between wet and dry friction plates?

Wet friction plates operate in oil for cooling and lubrication, typically using paper-based materials. Dry friction plates operate without fluid, using higher-friction materials like ceramics or organics, generating more heat but providing direct engagement.

How do friction plate grooves affect performance?

Grooves facilitate fluid flow for cooling and debris removal in wet clutches, prevent hydroplaning, and provide consistent engagement by maintaining oil film control. Pattern design affects engagement smoothness and heat dissipation.

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