Precision CNC Turned Delrin Bearing Sleeve for Industrial and Automotive Applications

Delrin (POM - Polyoxymethylene) is an often-overlooked engineering plastic that frequently outperforms both Nylon and PEEK in many applications. It offers superior machinability, tighter tolerance capabilities, minimal moisture absorption (0.25% vs 8-10% for Nylon), and costs approximately one-fifth of PEEK.

For bearing sleeves specifically, Delrin represents the optimal material choice. It features a low coefficient of friction (0.1-0.3 against steel), excellent wear resistance, outstanding dimensional stability, and sufficient stiffness to maintain bearing clearance under load. While Nylon offers greater toughness and PEEK provides higher strength, Delrin occupies the sweet spot for most bearing sleeve applications.

• Precision Bore Tolerance
  ±0.01mm on bore diameter with bore roundness within 0.005mm and concentricity between bore and OD within 0.01mm, ensuring consistent bearing clearance and smooth shaft rotation.
• Dimensional Stability
  0.25% moisture absorption at saturation compared to 8-10% for Nylon, maintaining dimensions across full humidity ranges without swelling, shrinkage, or dimensional drift.
• Self-Lubricating
  Coefficient of friction 0.1-0.3 against steel, eliminating need for external lubrication in most applications and reducing maintenance costs while preventing lubricant contamination.
• Chemical Resistance
  Resistant to hydrocarbons, solvents, most acids and bases, water, and alcohol. Not recommended for strong acids or bases.
• Machinability
  Excellent machining characteristics with clean chips, no melting at proper speeds, and superior surface finish (Ra 0.8-1.6 straight off the tool), resulting in lower per-piece costs.

• Automotive: Window regulator bearing sleeves, door hinge bushings, wiper motor bearings, seat adjustment bushings, pedal bushings
• Food Processing Equipment: Conveyor roller bearings, pump wear rings, mixer shaft sleeves, filling machine bushings
• Industrial Machinery: Guide rail bearings, linear motion bushings, conveyor bearings, printer and copier bearing sleeves
• Medical Devices: Instrument bearing sleeves, analytical equipment bushings, diagnostic device bearings
• Marine Hardware: Rudder bearing sleeves, deck hardware bushings, winch bearings, pump wear rings
• Consumer Products: Appliance bearings, power tool bushings, sports equipment bearings, furniture hardware sleeves

• Plastic Machining Expertise: Daily machining of Delrin, Nylon, PEEK, and other engineering plastics with optimized parameters for each material
• Concentricity Control: Turning both bore and OD in single chucking to guarantee concentricity within 0.01mm
• Material Knowledge: Expert guidance on Delrin homopolymer vs POM copolymer and specialized grades including PTFE-filled and glass-filled options
• Tolerance Without Grinding: Achieving bore tolerances of ±0.01mm and surface finishes of Ra 0.8 straight off the lathe
• Volume Flexibility: Support for prototypes (1 piece) through full production (10,000+) with consistent inspection criteria
• FDA-Compliant Material: Sourcing of FDA-compliant Delrin grades for food contact applications with full material traceability

1. DFM Review: Assessment of sleeve dimensions, material selection, tolerance feasibility, and concentricity requirements
2. Material Preparation: Selection of dimensionally stable Delrin rod stock with material certification
3. CNC Turning: Complete machining of OD, facing, boring ID, chamfering, and grooving in single chucking operation
4. Optional Grooving: Internal or external grooves for snap rings, lubrication channels, O-rings, or retaining clips
5. Inspection: Comprehensive measurement of bore diameter, roundness, concentricity, length, and surface finish
6. Packaging: Individual protective packaging to prevent scratching of machined surfaces during transit