FANLIN TECH

25mm Air Bushing

25mm Air Bushing — Porous Carbon, Zero-Friction Rotary Motion, Sub-Micron Precision

Product Showcase

25mm Air Bushing — Overview

Product Overview

Fanlin 25mm Air Bushing (AB-CY25-40-30-MC01) is a precision cylindrical air bearing (air bushing) featuring porous carbon as the air-bearing surface material. Utilizing advanced porous media technology, it generates a uniform air film for zero-contact, zero-friction motion with 5 μm nominal air gap. With 25 mm bore diameter, 40 mm outer diameter, and 80 g weight, it delivers 200 N load capacity, making it ideal for precision rotary spindles, optical rotation stages, and high-speed machining applications.

Fanlin Tech specializes in precision air bearing technology, mastering both porous carbon and ceramic material systems. The AB-CY25-40-30-MC01 represents our standard air bushing platform for rotary and linear shaft applications, suitable for systems requiring frictionless motion with infinite resolution. Customization available for load, stiffness, and mounting configurations.

Core Parameters

Load Capacity

200 N

Air Gap

5 μm

Bore Diameter

25 mm

Weight

80 g

Key Features

Porous Media Technology

Uniform air film distribution via porous carbon media ensures stable floating height and superior vibration damping for precision rotary motion

Zero Friction & Wear

Contactless air-float operation with no mechanical wear — theoretically unlimited service life and no particle generation, ideal for cleanroom environments

High Speed Capability

Capable of linear speeds up to 50 m/s and high rotational speeds, suitable for high-speed machining spindles and dynamic positioning systems

Compact Cylindrical Design

25 mm bore, 40 mm OD, 30 mm height, only 80 g — designed for easy integration into shaft-guided precision mechanisms with insert or flange mounting options

Applications

Precision Rotary Spindles

High-speed, high-precision rotary spindles for machining, grinding, and engraving requiring zero-friction bearing support

Optical Rotation Stages

Rotation stages for interferometry, optical inspection, and scanning systems demanding nanometer-level motion accuracy

Semiconductor Wafer Inspection

Rotary axes for wafer handling, inspection, and metrology equipment requiring ultra-clean, particle-free operation

High-Speed Machining Spindles

Air bearing spindles for high-speed, high-precision material removal with minimal thermal generation and no mechanical vibration

Specifications

Parameter	Value
Type	Air Bushing (Cylindrical Air Bearing)
Nominal Bore Diameter	25 mm
Outer Diameter	40 mm
Height	30 mm
Weight	80 g
Air Bearing Surface	Porous Carbon
Housing Material	Anodized Aluminum
Bearing Type	Sleeve Type Air Bearing
Load Capacity	200 N
Air Gap	5 μm
Max Speed	50 m/s
Friction Coefficient	Near Zero
Resolution	Infinite
Rated Air Pressure	0.414 MPa (60 psi)
Recommended Pressure Range	0.414 ~ 0.552 MPa (60 ~ 80 psi)
Max Allowable Pressure	0.689 MPa (100 psi)
Air Inlet	M5 × 0.8
Air Supply Requirement	Clean, Dry Compressed Air
Recommended Shaft Diameter	25 mm
Mounting Options	Insert / Flange Mount (Optional)

FAQ

An air bushing (also called air sleeve) is designed to support a shaft in rotary or linear motion — the shaft passes through the bore and is supported by a uniform air film around its circumference. A flat air bearing supports a planar surface. The AB-CY25-40-30-MC01 is a bushing type, ideal for guiding precision shafts in rotation or linear translation.

We recommend hardened tool steel, stainless steel, or ceramic shafts with a surface roughness of ≤ 16 RMS and high roundness. The shaft surface must be free of scratches, pits, and particles for optimal air bearing performance and to prevent damage to the porous carbon surface.

Yes. The AB-CY25-40-30-MC01 supports both rotary and linear motion along the shaft axis, making it versatile for applications such as precision linear slides with rotary capability, or high-speed rotating spindles.

The porous carbon bearing surface provides inherent lubricity during brief air supply interruptions, reducing the risk of seizure. However, for critical applications, we recommend installing air pressure monitoring and interlock systems.

Get Detailed 25mm Air Bushing Specifications

Contact Fanlin Tech's engineering team for selection advice, technical specifications, and custom air bushing solutions