CNC Turned Sleeves: Custom Precision Machined Components

Precision-machined cylindrical components built to exact print tolerances for high-load mechanical, fluid power, and rotational assemblies.

Product Overview

CNC turned sleeves function as precision spacers, bushings, bearing journals, and alignment collars within demanding mechanical systems. Fabricated via multi-axis CNC turning and Swiss lathe centers, these components maintain strict concentricity between inner diameters (ID), outer diameters (OD), and end faces. Built strictly to customer engineering drawings (PDF/STEP/IGES), our sleeves eliminate assembly misalignment, withstand high radial loads, and deliver consistent performance in continuous-duty industrial environments.

Technical Specifications

Parameter	Standard Capability / Range
Outer Diameter (OD)	Diameter 5 mm - diameter 300 mm
Inner Diameter (ID)	Diameter 3 mm - diameter 250 mm
Standard Length	Up to 500 mm
Dimensional Tolerance	+/- 0.005 mm (Tighter tolerances achievable upon review)
Concentricity / Runout	Within 0.01 mm
Surface Roughness	Ra 0.2 um - 1.6 um
Supported Materials	Carbon Steel (1045, 4140, 8620), Stainless Steel (303, 304, 316, 17-4PH), Aluminum (6061-T6, 7075-T6), Brass (C36000), Bronze (C93200, C95400)
Heat Treatment Options	Annealing, Quenching & Tempering, Case Hardening (Carburizing), Induction Hardening (50-62 HRC)
Surface Finishes	Passivation (ASTM A967), Zinc Plating (RoHS compliant), Black Oxide, Anodizing (Type II / III), Electroless Nickel

Key Features

Strict Concentricity Control: Machined in single setups or via precision chucking to eliminate radial runout between ID and OD.

Controlled Wall Thickness: Maintained across thin-walled or heavy-duty configurations to prevent distortion during press-fit assembly.

Optimized Chip Evacuation: Internal grooves, oil ports, and chamfers integrated strictly per drawing specifications.

Full Material Traceability: Mill Test Reports (MTRs) provided for every raw material lot to verify chemical composition and mechanical properties.

Applications

Fluid Power: Hydraulic and pneumatic cylinder guide bushings, spool valve sleeves, and piston spacers.

Rotating Equipment: Gearbox bearing journals, motor shaft spacers, and rotor alignment collars.

Automotive & Heavy Duty: Suspension pivot sleeves, transmission thrust washers, and steering linkage spacers.

Industrial Automation: Linear guide mounts, robotic arm pivot pins, and actuation linkage sleeves.

Customization Options

Production adapts directly to submitted technical drawings and CAD files. Customization parameters include:

Geometries: Flanged sleeves, stepped IDs/ODs, internal/external threading, cross-drilled oil holes, and snap-ring grooves.

Tolerances: Selective grinding operations for fit classes (e.g., H7/g6, H7/p6).

Prototyping to Mass Production: Single-piece sample runs for validation, scaling up to high-volume recurring production batches.

Quality Control & Inspection

Manufacturing output is verified using calibrated metrology equipment, ensuring compliance with ISO 9001 standards before shipment:

Dimensional Verification: Coordinate Measuring Machines (CMM) and digital micrometer sets.

ID/OD Control: Air gauges, plug gauges, and bore micrometers.

Form Inspection: Optical comparators and dial test indicators for concentricity, perpendicularity, and cylindricity.

Surface Integrity: Surface roughness testers (Ra profilometers) and portable hardness testers (Leeb/Rockwell).

Documentation: Inspection reports (First Article Inspection - FAI / ISIR) supplied upon request.

Production Infrastructure & Delivery

Manufacturing Infrastructure: Equipped with Tsugami and Citizen sliding-head Swiss lathes for high-volume miniature sleeves, alongside DMG MORI turning centers with live tooling for complex secondary milling operations.

Lead Times: Prototype runs dispatched in 7-12 business days; production batches scheduled via Kanban or blanket order releases.

Packaging: VCI (Volatile Corrosion Inhibitor) anti-rust paper wrapping, individual slotted compartment packaging, and export-grade reinforced cartons or wooden crates to prevent transit damage.

Frequently Asked Questions

Q: What file formats are accepted for quotation?

A: 2D drawings in PDF format (detailing tolerances, threads, and surface finishes) paired with 3D models in STEP, IGES, or Parasolid format.

Q: Can you supply material test certificates with the shipment?

A: Yes. Mill Test Certificates (MTRs) linking the raw material heat number to the finished parts are included with every order.

Q: What is the minimum order quantity (MOQ)?

A: MOQ is evaluated per part geometry and material setup requirements. Pilot runs of 50 to 100 pieces are routinely accommodated for engineering evaluation.

Q: How do you prevent corrosion during ocean freight?

A: Parts are coated with a protective rust-inhibiting oil film, sealed in VCI bags, and packed with desiccants inside moisture-barrier cartons.