Precision Actuator Shaft

Name: Servo Shaft for Smooth & Accurate Drive Motion – Frigate
Price: 249.00 USD
Availability: InStock

A Precision Actuator Shaft must resist angular displacement when subjected to fluctuating torque loads, particularly in servo-controlled or electromechanical actuation systems. Inadequate torsional rigidity compromises motion fidelity and leads to phase lag in feedback-controlled environments. Precision Actuator Shafts are engineered using high-modulus alloys and uniform cross-sections to minimize torsional strain under real-time loading. Heat treatment and microstructure refinement ensure consistent torque transmission characteristics across variable duty cycles without introducing hysteresis or backlash.

Material

Alloy Steel (4140, hardened), Stainless Steel (17-4PH), Titanium (Grade 5)

Dimensional Tolerances

Bearing Journals – h5 (ISO 286); General Shaft – h7

Length Tolerance

Per Meter – ±0.05 mm +; Overall – ±0.1 mm

Straightness

Per Meter – ≤0.02 mm; Overall – ≤0.05 mm

Concentricity/Runout

Journal-to-Journal – ≤0.01 mm TIR; Thread/Bore Runout – ≤0.015 mm

Product Description

Any deviation from concentric rotation in a Precision Actuator Shaft can generate oscillating radial forces that degrade bearing life and compromise encoder precision. To mitigate this, each Precision Actuator Shaft is manufactured to maintain total indicated runout (TIR) below 10 microns across all critical diameters. Advanced cylindrical grinding and post-process verification ensure alignment between the rotational axis and the functional surfaces. This degree of control supports vibration-free motion and reliable signal output in high-speed applications.

Surface Finish

Bearing Seats – Ra ≤0.2 µm (superfinish); Sealing Surfaces – Ra ≤0.4 µm

Hardness/Heat Treatment

Core – 28-32 HRC (toughness); Surface – 50-55 HRC (induction hardened, 0.5-2mm depth)

Keyway/Spline/Thread

Keyway – ISO 7738 (JIS B 1301); Spline – DIN 5480 Class 5; Thread – 6g (ISO 965)

Burr-Free Requirement

Fully Deburred (ISO 13715 compliant); Edge Radius – 0.1-0.3 mm

Certification Standards

ISO 286-1 (Tolerances), DIN 743 (Shaft Calculations), RoHS/REACH Compliant

Technical Advantages

The working surfaces of a Precision Actuator Shaft—such as splines, bearing journals, and actuator contact areas—must exhibit high wear resistance while maintaining internal ductility. Controlled surface hardening processes, including nitriding and selective induction hardening, are applied to achieve hardness levels up to 60 HRC. This prevents surface fatigue, brinelling, and wear under dynamic axial and radial loading. Each Precision Actuator Shaft is hardened to specified case depths while preserving core mechanical properties to handle shock and cyclic stress.

A Precision Actuator Shaft must preserve geometrical stability along its full working length to interface seamlessly with linear guides, rotary encoders, and actuator housing assemblies. Shafts are precision ground to IT5–IT6 tolerances, ensuring consistent radial profiles and axial straightness better than 0.02 mm/m. This dimensional fidelity reduces clearance variations and ensures predictable fit behavior in both sliding and interference assemblies. Every Precision Actuator Shaft undergoes CMM inspection to validate cylindrical form, taper control, and feature location.

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Industry Applications

Servo Motor Drives

Ensures precise torque transfer and angular positioning under closed-loop feedback in high-speed industrial motion control systems.

Linear Electromechanical Actuators

Provides accurate axial displacement and minimal backlash in ball screw or rod-style actuator assemblies under dynamic loading conditions.

Robotic Joint Assemblies

Maintains concentric rotation and consistent stiffness for articulated robot arms requiring repeatable multi-axis movement and fine positioning.

Aerospace Flight Control Systems

Operates within tight tolerances to transmit mechanical input to control surfaces in high-vibration, thermally variable aerospace environments.

Semiconductor Wafer Handling Equipment

Supports high-precision motion in cleanroom-rated actuators used for wafer alignment, transport, and inspection stages.

Medical Imaging Machines

Delivers ultra-smooth, backlash-free movement in CT or MRI gantry actuators where exact positioning and low noise are critical.

Material Stability in Thermal and Corrosive Environments

Thermal gradients and chemical exposure can degrade shaft performance unless material properties are tightly controlled. A Precision Actuator Shaft intended for cleanroom, vacuum, or high-humidity applications is typically fabricated from stabilized stainless steels such as 17-4 PH or 440C, with optional surface passivation. Material selection accounts for thermal expansion compatibility with housing components, minimizing distortion under temperature shifts. Coated variants of Precision Actuator Shaft using DLC or TiN provide additional resistance to oxidation, galling, and chemical degradation.

End features of a Precision Actuator Shaft directly influence power transfer efficiency and mechanical alignment with coupling elements. Splines, threads, flats, and other drive interfaces are machined to ANSI, DIN, or ISO standards with flank engagement and pitch accuracy optimized for zero-backlash operation. These features are critical in high-resolution actuators requiring precise synchronization or direct-drive control. Shaft end tolerances are verified using optical metrology and contact profilometers to ensure correct interface geometry and repeatable torque transmission.

Having Doubts? Our FAQ

Check all our Frequently Asked Question

How does Frigate control torsional stiffness in actuator shafts for heavy dynamic loads?

Frigate uses high-modulus alloys like 42CrMo4 and applies through-hardening processes to ensure uniform torsional stiffness across the shaft length. Finite Element Analysis (FEA) is performed to optimize shaft geometry for torsional load paths. This minimizes angular deflection in closed-loop servo or robotic assemblies. As a result, shafts deliver stable torque response under cyclic and impact loads.

What inspection methods does Frigate use to ensure shaft runout and concentricity?

Frigate employs high-resolution CMMs and form testers to measure total indicated runout below 10 µm at all functional diameters. Concentricity is validated between bearing journals, encoder surfaces, and coupling zones. These inspections follow ISO 1101 geometric tolerancing standards. This ensures vibration-free operation and exact alignment in precision motion systems.

Can Frigate deliver actuator shafts with tight spline tolerance for high-load torque couplings?

Yes, Frigate machines splines to DIN 5480 and ANSI B92 standards with pitch and profile error kept under 20 µm. Optical comparators and CNC gear inspection tools verify flank angle accuracy and profile concentricity. These shafts eliminate backlash and support high-torque, zero-slip interfaces. Custom spline lengths and fit tolerances are also supported.

How does Frigate handle corrosion protection for shafts used in cleanroom or offshore environments?

Frigate offers stainless steel options like 17-4 PH and 316L for high-corrosion resistance in wet, chemical, or vacuum conditions. For additional protection, shafts can be coated with TiN, DLC, or black oxide as required. Coating thickness and adhesion are tested using microhardness and cross-hatch adhesion tests. This ensures long-term performance without surface degradation.

What is Frigate’s process for maintaining axial straightness in long actuator shafts?

Frigate uses controlled stress-relieving before final grinding to eliminate thermal distortion in long shafts. Shafts are straightened and verified using laser measurement systems with tolerance limits below 0.02 mm/m. The final finish is applied using centerless grinding to maintain form and concentricity. This guarantees accurate linear travel in high-stroke actuator systems.

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Registered Office

10-A, First Floor, V.V Complex, Prakash Nagar, Thiruverumbur, Trichy-620013, Tamil Nadu, India.

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