Custom POM Bushings Manufacturer & Supplier

Precision-machined Acetal (Delrin®) bushings for high-load, low-friction applications. We manufacture strictly to print—no off-the-shelf parts.

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Copolymer & Homopolymer FDA Compliant Grades High Stiffness Low Moisture Absorption

Built to Print, Not from Stock

As a specialized custom POM bushings manufacturer and supplier, Rapidaccu bridges the gap between prototyping and mass production. We do not carry standard catalog sizes. Every bushing is CNC turned or milled to your specific CAD data, ensuring critical features like interference fits and surface finishes are optimized for your assembly.

Why Choose POM (Acetal)?

POM vs. Nylon

POM absorbs 10x less moisture than Nylon, maintaining dimensional stability in humid environments.

POM vs. PTFE

POM is significantly harder and stiffer than PTFE, making it better for high-load structural bushings.

POM vs. PEEK

POM offers similar mechanical strength at a fraction of the cost, for temps < 100°C.

POM vs. Metal

POM is self-lubricating, quieter, and corrosion-free, eliminating the need for external grease.

Designer’s Checklist

Before finalizing your POM bushing drawing, ensure these critical factors are addressed to avoid manufacturing issues.

Corner Radii

Avoid sharp internal corners. Use a minimum 0.5mm radius to reduce stress concentration and prevent cracking.

Wall Thickness

Keep walls uniform. Heavy cross-section changes cause voids and warping during cooling.

Thermal Gap

Calculate the “closing in” effect. Press-fitting POM into metal reduces the ID. We can help calculate this.

Material Grade

Specify Homopolymer (Delrin) for strength, or Copolymer (Acetron) for center-line porosity freedom.

Manufacturing Capability Matrix

Parameter	Specification Range	Inspection Method
Outer Diameter (OD)	2mm to 400mm	Laser Micrometer / CMM
Inner Diameter (ID)	1mm to 380mm	Air Gauge / Bore Gauge
Wall Thickness	Min 0.5mm	Ultrasonic Thickness Gauge
Concentricity	Up to 0.02mm TIR	Bench Center / CMM
Roundness	Up to 0.01mm	Roundness Tester
Surface Finish	Ra 0.4 – 1.6 µm	Profilometer

Quality Assurance & Traceability

For critical applications, material verification is non-negotiable. We ensure every batch of POM bushings meets strict quality standards.

Incoming material verification (FTIR analysis if required).
Full lot traceability from raw rod to finished part.
In-process probing and final CMM reports.
PPAP Level 1-3 and FAI reports available.

ISO 9001:2015 Compliant

Our quality management system ensures consistency across production runs.

Fit & Tolerance Guidance

POM is rigid but still responds to moisture and thermal changes. Below are general recommendations for press-fit vs slip-fit applications (Unit: mm).

Fit Type	Housing Bore (H7)	Bushing OD	Shaft Clearance
Press Fit (Light)	Ø 20.000 – 20.021	Ø 20.040 – 20.060	H9 / d9
Press Fit (Heavy)	Ø 20.000 – 20.021	Ø 20.080 – 20.100	Requires ID resizing
Slip Fit	Ø 20.000 – 20.021	Ø 19.960 – 19.980	f7 / h7

*Guidance only. Actual fit depends on wall thickness, housing material, and operating temperature.

Case Study: The “Squeaking” Conveyor Problem

The Challenge: A food packaging OEM was using standard Nylon bushings in a humid environment. The bushings swelled, causing shaft seizure and an audible squeak that signaled line failure.

Our Solution: We re-engineered the component using Food-Grade POM Copolymer. We adjusted the running clearance to account for a washdown cycle (thermal shock) and added a spiral groove for drainage.

The Result: The new POM bushings maintained dimensional stability with zero moisture absorption. Line uptime increased by 40%, and the squeaking was eliminated. Inspection confirmed OD roundness within 0.015mm post-machining.

Precision POM Bushings for Your Project

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FAQ: Custom POM Bushings

What is the difference between Acetal Homopolymer (Delrin) and Copolymer?

Homopolymer (Delrin) is slightly harder and stronger but can have center-line porosity in thick sections. Copolymer is more resistant to hydrolysis (hot water) and is porosity-free, making it better for medical and food applications.

Can POM bushings run without lubrication?

Yes, POM has excellent natural lubricity and low friction. However, initial lubrication improves life. For completely dry running, we recommend PTFE-filled POM grades.

Do you offer off-the-shelf sizes?

No. Rapidaccu is a custom manufacturer. We machine parts strictly according to customer-supplied drawings and specifications.

What are the temperature limits for POM bushings?

POM is stable up to approx 100°C (212°F) for continuous use. For higher temperatures, we recommend switching to PEEK or PTFE.

How do you ensure tight tolerances on plastic?

We use sharp, polished tools, controlled cutting speeds, and temperature-controlled inspection rooms. We also stress-relieve material before finish machining to prevent warping.

What is the minimum order quantity (MOQ)?

We accommodate both prototyping (1-10 pcs) and low-to-mid volume production runs (1000+ pcs). There is no strict MOQ, but setup costs apply to small batches.

Can you machine internal grooves or threads?

Yes. Our CNC turning centers can machine complex internal features, including oil grooves, snap-ring grooves, and standard or custom threads.

Is POM suitable for vacuum applications?

Standard POM can outgas slightly. For high-vacuum or semiconductor applications, we typically recommend PTFE or PEEK instead.

Get Your Quote Today

Send us your prints. Our engineering team reviews every inquiry for DFM and cost-saving opportunities.

sales@rapidaccu.com

Response typically within 24 hours.