Buy MC Nylon Tube: Manufacturers & Companies Whitepaper

Extruded PA66 tubes are produced by melting solid polymer pellets through an extruder barrel, forcing the melt through an annular die under high pressure, followed by rapid surface water cooling. This process limits wall thickness (typically under 25mm) due to internal voiding, while high molecular orientation causes directional stress. In contrast, MC Nylon (PA6G) uses liquid caprolactam monomer poured into molds and polymerized at atmospheric pressure with catalyst systems. This achieves molecular weights 2 to 3 times higher, virtually eliminates internal voiding, allows wall thicknesses over 100mm, and yields superior wear resistance and post-machining stability.

MC Nylon typically absorbs 1.5% to 2.0% atmospheric moisture under standard ambient conditions, swelling linearly by roughly 0.2% to 0.3% per 1% of absorbed moisture (and up to 6%-7% at complete underwater saturation). For precision components (such as IT7 to IT8 tolerances), machinists should rough-turn parts leaving 1.5mm to 2.0mm of stock, allow ambient humidity stabilization, and apply sharp carbide or diamond (PCD) tools with positive rake angles (15° to 30°) along with flood coolant to prevent thermal expansion during the final finish pass.

Yes. Oil-filled and MoS2-compounded MC Nylon tubes frequently replace phosphor bronze bushings in low-to-medium speed, high-load sliding applications (PV values up to 1.8 MPa·m/s unlubricated, and over 4.5 MPa·m/s with light initial lubrication). The polymer will not gall mating steel shafts, runs reliably without constant grease lubrication, cushions impact shock loads, and cuts bearing assembly weight by nearly 85%.

Standard stocked outer diameters (OD 50mm to 500mm) have no strict minimum order requirement and can ship within 5 to 7 business days. Custom inner/outer diameter combinations or specialty color and additive batches (such as MoS2 or custom blue) generally carry a low MOQ of 300 kg to 500 kg to balance mold pre-heating and centrifugal casting cycles, with production lead times running 15 to 20 working days.

Tubes are wrapped in multi-layer moisture-barrier plastic wrap with interior desiccant pouches to mitigate maritime humidity changes. Heavy-wall hollow bars are secured in heavy-duty plywood crates or banded to solid, fumigated timber skids with internal longitudinal supports. This reinforces the tubes against crushing loads and radial distortion during marine container handling and transit.