POM-H Tube — IDs, ODs, Wall Thicknesses & Lengths
POM-H tube is hollow cylindrical stock produced from acetal homopolymer (polyoxymethylene homopolymer), offering the higher mechanical strength and fatigue resistance of POM-H in a pre-formed tubular shape. Starting from tube rather than boring solid rod saves significant machining time for hollow components such as high-load bushings, bearing sleeves, and precision annular parts.
At a glance:
- Standard OD range: approximately 1" to 6" with matching ID dimensions
- Wall thicknesses: standard and heavy wall options available
- Standard lengths: 2 ft and 4 ft
- Material: Acetal Homopolymer — Polyoxymethylene Homopolymer (POM-H)
- Color: Natural (white/off-white)
- Water absorption (24 h / 96 h): 0.05 / 0.1 % — stable bore dimensions in service
Standard Size Table
POM-H tube is stocked in common OD/ID combinations to minimize material removal:
| OD | ID | Wall | Standard Lengths | Notes |
|---|---|---|---|---|
| 1.0" | 0.5" | 0.25" | 2 ft, 4 ft | Small high-load bushing stock |
| 1.5" | 0.75" | 0.375" | 2 ft, 4 ft | Bearing sleeves |
| 2.0" | 1.0" | 0.5" | 2 ft, 4 ft | Medium bore components |
| 2.5" | 1.5" | 0.5" | 2 ft, 4 ft | Guide rings, spacers |
| 3.0" | 2.0" | 0.5" | 2 ft, 4 ft | Heavy-duty sleeves |
| 4.0" | 2.5" | 0.75" | 2 ft | Large bore, high-load applications |
Contact Ready Plastics to confirm OD/ID stock and request custom wall configurations.
Mechanical & Thermal Properties
From Ready Plastics POM-H specification data:
| Property | Value |
|---|---|
| Density | 1.49 g/cm³ |
| Water absorption (24 h / 96 h) | 0.05 / 0.1 % |
| Flammability (UL 94) | HB |
| Heat deflection temp. (HDT, Method A) | 141 °C / 285 °F |
| Service temp. (long term) | 110 °C / 230 °F |
| Service temp. (short term) | 150 °C / 300 °F |
| Tensile strength | 53 MPa / 7,600 psi |
| Flexural strength | 85 MPa / 12,000 psi |
| Shore D hardness | 81 |
| Thermal conductivity | 0.46 W/m·K |
Typical Applications
POM-H tube stock is specified where hollow components must carry elevated mechanical loads:
- High-load plain bearings and sleeve bushings — higher strength supports greater radial and axial loads vs. copolymer grades
- Precision gear shaft bushings — fatigue resistance for high-cycle gear and shaft interfaces
- Automation and robotics guide sleeves — dimensional stability under sustained mechanical loads
- Pump and valve internals — chemical resistance in light-duty fluid applications
- Bearing retainer rings — stiffness maintains geometry under combined loading
- Tooling and fixture components — dimensional accuracy critical for production tooling
Machining POM-H Tube
POM-H tube machines cleanly on a lathe with standard carbide or HSS turning inserts. Its higher crystallinity compared to copolymer acetal provides a slightly firmer chip but does not require changes to tooling or basic approach. Maintain consistent clamping pressure to avoid distortion on thin-wall sections — use soft jaws or a plug mandrel for the bore when finish-turning the OD. Parting and facing produce clean, burr-free surfaces at standard parameters.