Friction Discs: Torque Range 5 Nm to 5000 Nm, Thickness 2-10 mm

Component Specifications

Definition

Friction discs are precision-engineered, annular components integral to torque limiters, a type of mechanical safety clutch. They consist of one or more pairs of discs with high-friction surfaces that are pressed together under axial force (typically via springs or pneumatic pressure). When the transmitted torque exceeds a preset threshold, the discs slip relative to each other, decoupling the drive and driven sides to prevent damage from overload, shock loads, or jams. They provide reliable, repeatable torque limitation and can be reset automatically or manually after the overload condition is cleared.

Working Principle

Friction discs operate on the principle of controlled frictional engagement. Under normal operating conditions, axial force clamps the discs together, creating frictional torque that transmits power. When torque exceeds the preset limit (determined by the axial force and friction coefficient), the frictional force is overcome, causing the discs to slip. This slippage limits the transmitted torque to the preset value, protecting downstream components. Once the overload is removed, the discs re-engage automatically if the design permits, or require manual reset.

Materials

Typically composed of a friction pair: one disc is made of hardened steel (e.g., 1045 carbon steel, case-hardened) or stainless steel for strength and wear resistance; the mating disc features a friction lining of sintered metal (copper- or iron-based), organic composite (resin-bonded fibers like cellulose, aramid, or glass), or ceramic-based materials. Linings are chosen for stable friction coefficient, high heat resistance, low wear, and compatibility with operating environment (e.g., oil-free or lubricated).

Technical Parameters

Parameter	Typical range	Notes & selection driver
Thickness	2-10 mm
Axial Force	50-5000 N
Torque Range	5 Nm to 5000 Nm
Slip Accuracy	±5-10% of set torque
Inner Diameter	10-150 mm
Outer Diameter	20-300 mm
Friction Coefficient	0.1-0.6 (dry or lubricated)
Operating Temperature	-30°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 16030, DIN 748, ISO 1940

Parent Products

This component is used in the following industrial products

Torque Limiter

A safety device that prevents mechanical overload by limiting the maximum torque transmitted through a drive system.

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Clutches

Mechanical devices that engage and disengage power transmission between rotating shafts in drawworks systems.

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Engineering Analysis

Risks & Mitigation

Wear and tear reducing torque accuracy
Overheating from prolonged slippage
Contamination (oil, dust) altering friction
Incorrect installation leading to premature failure
Material incompatibility with operating environment

FMEA Triads

Trigger: Excessive wear due to high cycle frequency or abrasive conditions
Failure: Reduced torque transmission, inaccurate slip torque, eventual disc failure
Mitigation: Use wear-resistant materials, regular inspection, and replace per maintenance schedule

Trigger: Thermal degradation from prolonged slippage or high ambient temperature
Failure: Fade in friction coefficient, material cracking, loss of torque capacity
Mitigation: Design with heat dissipation features, limit slip duration, select high-temperature materials

Trigger: Contamination by lubricants, dirt, or moisture
Failure: Unstable friction behavior, erratic slipping, accelerated wear
Mitigation: Use sealed housings, select contamination-resistant materials, implement clean operating environments

Industrial Ecosystem

Compatible With

Torque limiters, safety clutches, overload protection devices in conveyors, pumps, mixers, packaging machinery, and industrial drives

Typical Suppliers & Equivalents

Maybach, Ringspann, Stromag, Altra Industrial Motion, Rexnord, Siemens, local OEM brands with equivalent specifications

Compliance & Inspection

Tolerance

Dimensional tolerances per ISO 2768-m, friction surface flatness within 0.02 mm, parallelism within 0.01 mm

Test Method

Torque testing via calibrated dynamometer, wear testing per ISO 1940, thermal cycling tests, friction coefficient measurement under controlled 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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CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Friction Discs

Manufacturer profiles associated with Friction Discs.

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Seal Groove

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Frequently Asked Questions

How do friction discs protect machinery?

They slip at a preset torque limit, disconnecting drive to prevent damage from overloads, jams, or shock loads, acting as a mechanical fuse.

Can friction discs be used in wet or oily environments?

Yes, specific friction materials (e.g., oil-compatible sintered metals) are designed for lubricated applications, while dry types use organic composites.

What maintenance do friction discs require?

Periodic inspection for wear, contamination, and surface degradation; replacement when wear exceeds thickness tolerances or torque accuracy declines.

How is the slip torque adjusted?

By changing axial force via spring preload adjustment, pneumatic pressure, or using discs with different friction coefficients, as per manufacturer guidelines.

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 Discs