Precision CNC Turned Delrin Bearing Sleeve for Industrial and Automotive Applications
Price:
Negotiable
MOQ:
Negotiable
Delivery Time:
Negotiable
Product Description
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
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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.
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Dimensional Stability0.25% moisture absorption at saturation compared to 8-10% for Nylon, maintaining dimensions across full humidity ranges without swelling, shrinkage, or dimensional drift.
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Self-LubricatingCoefficient of friction 0.1-0.3 against steel, eliminating need for external lubrication in most applications and reducing maintenance costs while preventing lubricant contamination.
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Chemical ResistanceResistant to hydrocarbons, solvents, most acids and bases, water, and alcohol. Not recommended for strong acids or bases.
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MachinabilityExcellent 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
- 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
Why Choose Sinbo Precision
- 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.
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Company
Sinbo Precision Mechanical Co., Ltd.
Location
Factory 1: No.7,Mingzhu 2 road,Shebei,Huangjiang,Dongguan,Guangdong,China 523752 Factory 2: No.19,Mingzhu 1 road,Shebei,Huangjiang,Dongguan,Guangdong,China 523752
Contact Person
Yang