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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.
Key Features
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.
Technical Specifications
Specification
Details
Product Name
CNC Turned Delrin Bearing Sleeve
Material Options
Delrin (POM Homopolymer), Celcon (POM Copolymer), Delrin AF (PTFE-filled)
Tolerance
±0.01mm (bore, OD), ±0.05mm (length)
Bore Roundness
0.005mm max
Concentricity
0.01mm max (bore to OD)
Surface Finish
Ra 0.8 (bore), Ra 1.6 (OD)
Operating Temperature
-40°C to +90°C continuous, +105°C intermittent
Moisture Absorption
0.25% at saturation
Certifications
ISO 9001:2015, IATF 16949, RoHS, CE, REACH
Lead Time - Prototype
3-7 days
Lead Time - Production
7-15 days
MOQ
1 piece (prototype), 100+ (production)
Origin
Dongguan, China
Applications
Automotive: Window regulator bearing sleeves, door hinge bushings, wiper motor bearings, seat adjustment bushings, pedal bushings
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
Manufacturing Process
DFM Review: Assessment of sleeve dimensions, material selection, tolerance feasibility, and concentricity requirements
Material Preparation: Selection of dimensionally stable Delrin rod stock with material certification
CNC Turning: Complete machining of OD, facing, boring ID, chamfering, and grooving in single chucking operation
Optional Grooving: Internal or external grooves for snap rings, lubrication channels, O-rings, or retaining clips
Inspection: Comprehensive measurement of bore diameter, roundness, concentricity, length, and surface finish
Packaging: Individual protective packaging to prevent scratching of machined surfaces during transit
Frequently Asked Questions
Delrin or Nylon for my bearing sleeve?
Delrin offers superior dimensional stability and machinability, while Nylon provides better impact resistance and load capacity. For humid or wet environments, Delrin is typically the better choice as Nylon absorbs water and may swell, potentially causing bearing seizure. For impact-loaded applications, Nylon's higher toughness may be advantageous.
Can Delrin replace a bronze bearing sleeve?
Yes, for low-to-medium speed applications (under 1,000 RPM surface speed). Delrin sleeves are self-lubricating, lighter (1/6 the weight of bronze), corrosion-proof, and more cost-effective to machine. The trade-offs include lower load capacity and temperature rating compared to bronze or steel bearings.
What's the difference between Delrin and POM copolymer?
Delrin is POM homopolymer with higher tensile strength, stiffness, and fatigue resistance. POM copolymers offer better chemical resistance to strong bases and improved thermal stability. For most bearing applications, the differences are negligible and either grade performs well.
Do you offer PTFE-filled Delrin (Delrin AF)?
Yes. Delrin AF features an even lower coefficient of friction and is recommended for high-speed or high-PV bearing applications. It machines similarly to standard Delrin but costs approximately 30% more.
Can you machine very thin-walled sleeves?
We can machine sleeves down to approximately 1mm wall thickness on bore diameters up to 50mm. Below this thickness, sleeve deflection during machining makes tolerance maintenance challenging. Alternative approaches include using thicker rod stock or specialized tube stock for very thin walls.
What's the lead time for 1,000 bearing sleeves?
7-10 days. Delrin's excellent machinability and material availability enable production rates of 3,000-5,000 pieces per day on a single CNC lathe for simple geometries. Additional processes like plating or post-machining treatments may add 2-3 days.
