Flexible Body/Spider: Torque Capacity 0.5-5000 Nm

Component Specifications

Definition

A flexible body/spider is a critical elastomeric or polyurethane element within flexible couplings that connects two shafts, allowing for angular, parallel, and axial misalignment while damping vibrations and absorbing shock loads. It provides torsional flexibility to protect connected equipment from torque spikes and reduces wear on bearings and seals.

Working Principle

Works through elastic deformation of its flexible material (typically polyurethane or rubber) when torque is applied, allowing it to twist slightly to accommodate shaft misalignment while maintaining torque transmission. The spider-shaped design with multiple legs distributes stress evenly and provides damping characteristics.

Materials

Polyurethane (most common), Nitrile rubber (NBR), Hytrel, Neoprene, or other engineered elastomers with specific hardness ratings (typically Shore A 92-98 for polyurethane).

Technical Parameters

Parameter	Typical range	Notes & selection driver
Max RPM	5000-10000
Hardness	Shore A 92-98
Bore Sizes	3-100 mm
Torque Capacity	0.5-5000 Nm
Temperature Range	-40°C to +100°C
Misalignment Compensation	Angular: 1-4°, Parallel: 0.2-3 mm, Axial: ±0.5-2 mm

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

DIN 740, ISO 14691, AGMA 9000

Parent Products

This component is used in the following industrial products

Coupling Element

A mechanical component within a precision gearbox or coupling system that transmits torque while accommodating misalignment between connected shafts.

View Product Details

Engineering Analysis

Risks & Mitigation

Material degradation from oil/chemical exposure
Overheating from excessive misalignment
Premature failure from improper installation
Torsional resonance at certain RPM ranges

FMEA Triads

Trigger: Excessive misalignment beyond design limits
Failure: Premature cracking and tearing of spider legs
Mitigation: Regular alignment checks and use of laser alignment tools during installation

Trigger: Chemical exposure incompatible with material
Failure: Swelling, softening, or hardening leading to loss of flexibility
Mitigation: Select appropriate material (e.g., polyurethane for oils, NBR for chemicals) and implement protective covers

Trigger: Over-torque conditions
Failure: Permanent deformation or shearing of spider elements
Mitigation: Install torque limiters and regularly monitor operating conditions

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.1 mm on bore dimensions, ±2° on angular positioning

Test Method

Dynamic torque testing per ISO 14691, hardness testing per ASTM D2240, fatigue testing with cyclic misalignment

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 Flexible Body/Spider

Manufacturer profiles associated with Flexible Body/Spider.

Sourcing Flexible Body/Spider from China?

Tell us your specification and target quantity — we will match it against manufacturer records and come back with the factories that fit.

Request manufacturers We manufacture this

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

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

Chrome Plating

Hard chrome plating is an electroplating process that deposits a layer of chromium onto metal surfaces to enhance wear resistance, corrosion protection, and reduce friction for hydraulic cylinder piston rods.

Upper Tool (Punch)

Upper Tool (Punch) is the active forming component in metal plate bending machines that applies precise downward force to create bends in sheet metal.

Main Frame

The main frame is the primary structural component of a hydraulic press, providing rigidity and stability to withstand high compressive forces during metal forming operations.

Shaft Bearing

Precision component supporting rotating shafts in vibration motors to reduce friction and maintain alignment.

Frequently Asked Questions

What is the main purpose of a flexible body/spider in couplings?

To transmit torque between shafts while accommodating misalignment (angular, parallel, axial), damping vibrations, and protecting equipment from shock loads through elastic deformation.

How often should flexible spiders be replaced?

Typically every 12-24 months depending on operating conditions, but inspect quarterly for cracks, hardening, or permanent deformation. High-torque or misaligned applications require more frequent replacement.

Can different material spiders be used interchangeably?

No, material properties affect torque capacity, temperature resistance, and chemical compatibility. Always use the manufacturer-specified material for your application requirements.

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.

Flexible Body/Spider