Coupling or Flange: Torque Capacity 50-5000 Nm

Component Specifications

Definition

A coupling or flange is a precision-engineered component used in drive shafts and actuators to connect two separate rotating shafts, enabling the transmission of torque, speed, and rotational motion from a driving shaft to a driven shaft. It compensates for axial, radial, and angular misalignments between connected shafts, reduces vibration, and protects connected equipment from shock loads. In industrial applications, couplings can be rigid (for precise alignment) or flexible (to accommodate misalignment and dampen vibrations).

Working Principle

Couplings operate by physically linking two shafts through mechanical elements such as hubs, sleeves, or flanges. Torque is transmitted via friction, shear, or positive engagement (e.g., gear teeth, elastomeric elements). Flexible couplings use elastic materials or mechanical clearances to absorb misalignment and dampen vibrations, while rigid couplings maintain a fixed connection for precise alignment. Flanges typically involve bolted connections with gaskets to ensure a sealed, rigid joint.

Materials

Common materials include carbon steel (e.g., AISI 1045 for strength), stainless steel (e.g., 304/316 for corrosion resistance), alloy steel (e.g., 4140 for high torque), aluminum (for lightweight applications), and engineered polymers (e.g., polyurethane for flexible couplings). Coatings like zinc plating or powder coating may be applied for corrosion protection.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Backlash	0-0.2 mm (for precision couplings)
Max Speed	1000-10000 RPM
Torque Capacity	50-5000 Nm
Temperature Range	-40°C to 120°C
Bore Diameter Range	10-150 mm
Misalignment Tolerance	Axial: ±1-5 mm, Radial: ±0.5-3 mm, Angular: ±1-3 degrees

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 9001, ISO 14691, DIN 740, DIN 1151, AGMA 9000

Parent Products

This component is used in the following industrial products

Drive Shaft / Actuator

A mechanical component that transmits rotational motion and force within a tool change arm system.

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Engineering Analysis

Risks & Mitigation

Misalignment leading to premature wear and failure
Over-torque causing shear or fracture
Corrosion in harsh environments
Vibration-induced fatigue
Improper installation (e.g., incorrect bolt torque)

FMEA Triads

Trigger: Excessive misalignment beyond design limits
Failure: Accelerated wear, vibration, and eventual coupling fracture
Mitigation: Regular alignment checks using laser tools, install flexible couplings with higher misalignment tolerance

Trigger: Overload or shock torque exceeding rated capacity
Failure: Shear of coupling elements or bolt failure in flanges
Mitigation: Use couplings with torque limiters or safety factors, implement load monitoring systems

Trigger: Corrosion due to exposure to moisture or chemicals
Failure: Reduced structural integrity and seizure
Mitigation: Select corrosion-resistant materials (e.g., stainless steel), apply protective coatings, conduct routine inspections

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Dimensional tolerances per ISO 2768-m, alignment tolerances within ±0.05 mm for precision applications

Test Method

Torque testing per ISO 14691, dynamic balance testing to ISO 1940-1, fatigue testing under cyclic loads, and corrosion resistance testing per ASTM B117

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.

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Manufacturers of Coupling or Flange

Manufacturer profiles associated with Coupling or Flange.

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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 is the difference between a coupling and a flange?

A coupling is a device that connects two rotating shafts to transmit torque, often allowing for misalignment. A flange is a type of rigid coupling or connecting ring that bolts two shafts or pipes together, typically used for precise alignment and sealing in high-torque applications.

How do I select the right coupling for my application?

Consider torque requirements, shaft speed, misalignment types and tolerances, environmental conditions (e.g., temperature, corrosion), space constraints, and maintenance needs. Consult manufacturer specifications and standards like ISO 14691 for guidance.

What are common failure modes of couplings?

Common failures include wear from misalignment, fatigue cracking, corrosion, overheating due to excessive torque or speed, and bolt loosening in flanged connections. Regular inspection and alignment checks can mitigate these risks.

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.

Coupling or Flange