Inner Keyway Round Hollow Aluminum Tube for Motor Shaft Sleeves & Mechanical Transmission Systems

This 6063-T5 thick-wall round aluminum tube is produced as a one-piece hollow extrusion with a uniform wall section and an accurately formed internal keyway. The keyway provides reliable circumferential positioning and supports direct torque transmission with a standard flat key. Its combination of structural rigidity, dimensional consistency and low weight makes it suitable for motor shaft sleeves, transmission tubes, coupling sleeves and rotating mechanical components.

Available services include custom length cutting, CNC secondary machining, surface finishing and custom extrusion tooling to meet different equipment and assembly requirements.

Key Product Features

One-Piece Thick-Wall Extrusion

The hollow tube is formed through a single extrusion process, providing a consistent wall thickness throughout the profile. The reinforced cross-section improves resistance to torsional and bending loads and helps maintain dimensional stability during continuous rotation and sustained mechanical loading.

Integrated Internal Keyway

The accurately formed keyway provides a ready-to-use interface for flat-key assembly. It supports circumferential locking and torque transfer without requiring additional keyway machining after extrusion. This can shorten downstream processing time and reduce secondary machining requirements during assembly.

6063-T5 Aluminum Alloy Construction

Manufactured from 6063-T5 aluminum alloy, the tube provides a combination of mechanical strength, low density and thermal conductivity. Compared with steel components of similar function, the aluminum construction helps reduce component mass and rotating inertia, making it suitable for motor and mechanical transmission assemblies requiring lower weight.

Surface Treatment Options

The standard finish is a matte sandblasted anodized surface, providing additional protection against surface wear and corrosion while creating a uniform matte appearance. Electrostatic powder coating is also available for applications requiring alternative colors or surface characteristics.

Machining and Custom Manufacturing

The profile can be supplied in customized lengths and processed according to assembly requirements. Available secondary operations include CNC cutting, drilling and tapping. Custom extrusion dies are also available when a specific cross-sectional configuration is required.

Product Specifications

Typical Applications

The internal-keyway round aluminum tube is designed for mechanical assemblies where controlled torque transfer, rotational positioning and reduced component weight are required.

Typical applications include:

• Motor shaft sleeves — Used around motor shaft assemblies where lightweight construction and dimensional consistency are required.

• Transmission connecting tubes — Suitable for torque-transmitting mechanical drive systems.

• Coupling sleeves — Provides a keyed connection for mechanical coupling and shaft-related assemblies.

• Rotating shaft housings — Applicable to industrial rotating mechanisms requiring a rigid hollow aluminum section.

• Industrial automation equipment — Suitable for lightweight rotating and transmission components used in automated machinery.

• Servo motor systems — Applicable to mechanical transmission assemblies associated with industrial servo motors.

• New energy equipment — Suitable for auxiliary motor and drive components where reducing rotating mass is beneficial.

• Fan and water pump drive systems — Can be used in shaft-related structures and transmission assemblies.

Engineering and Processing Options

For projects requiring more than a standard extruded profile, the aluminum tube can be supplied with additional manufacturing services.

Custom Extrusion

New extrusion dies can be developed for non-standard dimensions or keyway configurations. This allows the cross-section to be matched to a customer's shaft, coupling or equipment design.

Length Cutting

Profiles can be supplied in specified cut lengths to reduce material preparation and downstream cutting operations.

CNC Secondary Machining

Additional drilling, tapping, cutting and other CNC operations can be performed according to technical drawings or assembly requirements.

Surface Treatment

The standard sandblasted matte anodized finish can be supplemented with electrostatic powder coating when the application requires different appearance or surface specifications.

Performance Advantages for B2B Applications

The combination of a thick-wall hollow structure and integrated keyway provides a practical balance between mechanical rigidity and weight reduction. The uniform extrusion wall helps maintain structural consistency, while the keyed internal profile supports repeatable circumferential positioning and torque transfer.

The aluminum construction is also advantageous in applications where rotating mass is an important design consideration. Compared with heavier steel shaft-related components, the lower density of aluminum can help reduce inertia and overall equipment weight.

For sealed mechanical assemblies, the smooth inner and outer surfaces can accommodate sealing rings or gaskets where the system requires dust protection or lubricant retention. Anodized surface treatment further improves resistance to environmental exposure and routine surface wear.

Manufacturing, Customization and Supply

The profile is available for standard procurement as well as customized industrial projects. Customers can specify required dimensions, extrusion tooling, cutting lengths, surface finish and CNC machining requirements according to the final assembly design.

The manufacturer supports sample orders and small trial batches, providing flexibility for prototype development, equipment testing and initial production validation before larger-volume orders.

Export orders are protected using PE film, plastic steel strapping, edge protectors and fumigated wooden pallets. The packaging configuration is designed for sea transportation and helps protect the aluminum profiles from handling damage and surface abrasion during international shipment.

For applications involving motor assemblies, mechanical transmissions, automation equipment, new energy machinery, fans or pumps, this 6063-T5 thick-wall round aluminum tube provides an integrated solution combining a rigid hollow extrusion structure, internal keyway functionality, lightweight construction, corrosion-resistant surface treatment and configurable secondary processing.