CNC Turned Sleeves

Detailed Description

Tubular geometry gives CNC turned sleeves a different function from solid pins and sliding bushings. Sleeve walls surround an internal element while establishing a defined outside diameter against another part. End shoulders set axial positions, and stepped bores accommodate more than one mating diameter along the length.

Spacer sleeves can separate two machine elements around a common shaft. Protective sleeves cover an exposed section, while a threaded version joins to an adjoining collar or housing. Turning connects the bore and outer cylinder through the same rotational setup.

Axial Spacing Within A Hollow Form

Shouldered spacers can separate a bearing face from a neighboring collar while the shaft passes uninterrupted through its bore. Hollow construction keeps the surrounding assembly compact.

Available Surface Finishes

• Anodizing: Improves corrosion resistance and surface appearance of aluminum sleeves.
• Black Oxide: Common protective finish for carbon steel components.
• Nickel Plating: Provides additional corrosion and wear resistance.
• Passivation: Suitable for stainless steel sleeves used in demanding environments.

Anodizing, black oxide, nickel plating and passivation cover several common metal finish routes. Selected finishes appear around an otherwise clearly defined cylindrical form.

Structural & Functional Breakdown

• Tubular Sleeve Structure: Provides separation, protection or alignment around shafts and assemblies.
• Stepped Bore Structure: Supports different internal mating diameters.
• Threaded Sleeve Structure: Internal or external threads allow direct mechanical connection.
• Shouldered Sleeve Structure: Machined shoulders provide axial positioning.

Stepped bores and shoulders place separation and positioning surfaces along the sleeve axis. Grooves or threads add local engagement without replacing the continuous tubular wall.

Key Features

• Controlled Bore Geometry: CNC boring supports consistent internal dimensions.
• Concentric ID/OD Machining: Helps maintain alignment between internal and external cylindrical surfaces.
• Thin-wall Machining Capability: Machining strategy can be adjusted to reduce deformation in thinner sleeves.
• Flexible Feature Integration: Threads, grooves, holes and shoulders can be added according to drawings.

Thin walls keep the sleeve envelope compact around an internal component, with end faces providing the visible axial reference surfaces.

Applications

• Machine Assemblies
• Hydraulic Systems
• Bearing Supports
• Industrial Automation
• Mechanical Spacers & Protectors

Machine assemblies often use sleeves to space a pulley, bearing support or locating collar along a shaft. Hollow centers let that mechanical element continue through the part instead of ending at the sleeve.

Hydraulic equipment and industrial automation may use similar tubes as protective or alignment pieces. Each sleeve combines an internal passage with an external locating diameter in a single turned component. In CNC turned sleeves, the hollow center and outer locating wall perform separate functions within one continuous tubular body.