Editorial Technical Reference

Rotary Actuators

This page explains how Rotary Actuators is classified within Machinery and Equipment Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

Mechanical devices that convert energy into rotary motion to control angular positioning in mechanical systems.

Representative product image. Confirm appearance and specifications with the manufacturer.

Product Specifications

Technical details and manufacturing context for Rotary Actuators

Definition
Rotary actuators are precision components within the Wrist Assembly that provide controlled rotational movement, enabling the wrist's articulation and positioning capabilities. They serve as the primary motion source for wrist rotation in robotic and automation applications. These actuators convert hydraulic, pneumatic, or electrical energy into torque through mechanisms such as gear trains, vane systems, or ball screw assemblies, producing precise angular displacement for wrist movement control. Typical specifications include a torque range of 10–500 N·m, operating pressure of 0.4–0.8 MPa, rotation angle of 0–90 degrees, positioning accuracy of ±0.5 degrees, supply voltage of 24 V DC ±10% for electric versions, operating temperature of -20 to 80 °C, protection class IP65–IP67 (IEC 60529), body material of 304 stainless steel (ASTM A276), and weight of 2–15 kg. Materials commonly used include stainless steel, aluminum alloy, and engineering plastics. These values are reference ranges and must be verified for the specific model and application. Always confirm model-specific parameters and standards with the legal manufacturer or supplier before procurement or installation.
Working Principle
Rotary actuators convert hydraulic, pneumatic, or electrical energy into torque through mechanisms like gear trains, vane systems, or ball screw assemblies. This torque produces precise angular displacement, enabling controlled rotation for wrist movement. The actuator's output torque and rotation angle are determined by the input energy and internal mechanism design. For pneumatic or hydraulic types, operating pressure directly influences output torque; below 0.4 MPa, torque drops significantly. Electric versions rely on supply voltage, typically 24 V DC ±10%. Positioning accuracy depends on the actuator's internal feedback and control system; higher accuracy requires feedback control. The rotation angle is typically 0–90 degrees for quarter-turn applications, but custom angles are available. Operating temperature range affects seal integrity; outside -20 to 80 °C, seals may fail. Protection class indicates suitability for environments like washdown; IP67 is recommended for such conditions.
Common Materials
Stainless Steel, Aluminum Alloy, Engineering Plastics
Technical Parameters
ParameterTypical rangeNotes & selection driver
Torque10–500 N·mSelect based on load and safety factor.
Operating Pressure0.4–0.8 MPaBelow 0.4 MPa output torque drops significantly.
Rotation Angle0–90 °Typical for quarter-turn valves; custom angles available.
Positioning Accuracy±0.5 °Higher accuracy requires feedback control.
Supply Voltage24 ±10% V DCFor electric actuators; pneumatic uses air pressure.
Operating Temperature-20–80 °CSeals may fail outside this range.
Protection ClassIP65–IP67IP67 for washdown environments.IEC 60529
Body Material304Stainless steel for corrosion resistance.ASTM A276
Weight2–15 kgDepends on torque and options.

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

Components / BOM
  • Housing Part
    Protects internal components and provides structural support
    Material: Aluminum Alloy
  • Output Shaft Part
    Transmits rotational torque to the wrist assembly
    Material: Stainless Steel
  • Seals Part
    Prevents fluid leakage and contamination in hydraulic/pneumatic actuators
    Material: Synthetic Rubber
  • Gear Train Optional
    Turns the drive input into shaft torque on geared builds.
  • Vane System Optional
    Takes the fluid pressure directly and swings the shaft on vane-type builds.
  • Ball Screw Optional
    Converts a linear push into rotation on ball-screw builds.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
speed: Up to 100 rpm
pressure: Up to 300 bar
temperature: -40°C to 120°C
torque range: 10 Nm to 5000 Nm
rotation angle: 0° to 360° (continuous) or 90°/180° (quarter/half-turn)
Media Compatibility
✓ Hydraulic oil ✓ Industrial lubricants ✓ Clean dry air
Unsuitable: Abrasive slurry environments
Sizing Data Required
  • Required torque (Nm)
  • Rotation angle (degrees)
  • Operating pressure (bar)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Seal degradation
Cause: Exposure to incompatible fluids, high temperatures, or particulate contamination leading to hardening, cracking, or extrusion of seals, resulting in internal or external leakage.
Bearing wear or failure
Cause: Inadequate lubrication, misalignment, excessive side loads, or ingress of contaminants causing increased friction, scoring, pitting, or seizure of bearing surfaces.
Maintenance Indicators
  • Audible grinding, clicking, or knocking noises during operation indicating internal mechanical interference or bearing damage.
  • Visible external fluid leakage around shaft seals or housing joints, often accompanied by reduced torque output or erratic movement.
Engineering Tips
  • Implement condition-based monitoring with vibration analysis and periodic oil sampling to detect early-stage bearing wear and fluid contamination before catastrophic failure.
  • Ensure proper alignment during installation and use flexible couplings where applicable to minimize side loads and torsional stresses on bearings and seals.

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ISO 5211:2017 - Mounting of industrial valves ANSI/B93.5M-1991 - Hydraulic fluid power - Rotary actuators DIN ISO 5211:2017-12 - Mounting of industrial valves

Quoted from the published standard.

Manufacturing Precision
  • Bore diameter: +/-0.025 mm
  • Flatness of mounting surfaces: 0.05 mm
Quality Inspection
  • Pressure testing for leakage (hydrostatic/pneumatic)
  • Torque output verification at specified pressure

Manufacturers of Rotary Actuators

4 companies list this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

Flutec Hydraulics
Wuxi, Jiangsu, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Leaderdrive
Shanghai, CN
Listed on the company's own website · profile compiled by CNFX from public sources
LEFOO Industrial Co., Ltd.
Zhejiang, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Zhejiang Laifual Drive Co., Ltd.
Beijing, CN
Also makes: Rotation Drive
Listed on the company's own website · profile compiled by CNFX from public sources

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

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.

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Frequently Asked Questions

What is the typical torque range for these rotary actuators?

The torque range is 10–500 N·m, but the actual torque required depends on the load and safety factor. Always select based on your specific application and verify with the manufacturer.

What operating pressure is recommended?

The operating pressure range is 0.4–0.8 MPa. Note that below 0.4 MPa, output torque drops significantly, so ensure adequate pressure for your application.

Can the rotation angle be customized?

The standard rotation angle is 0–90 degrees, typical for quarter-turn valves. Custom angles are available, but you must confirm with the supplier for your specific needs.

What is the positioning accuracy?

The positioning accuracy is ±0.5 degrees. Higher accuracy requires feedback control, so if your application demands tighter precision, discuss options with the manufacturer.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
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