Overview
This high pressure polyamide pipe is a rigid PA11/PA12 nylon tube built for centralized lubrication systems. It carries oil or grease from the pump and distribution valves to individual lubrication points, and it is specified where a flexible hose is not required. Because working pressure depends on diameter, ratings are stated per size in the table below rather than as a single headline figure.
Declared Specifications
| Specification | Value |
|---|---|
| Material | PA11/PA12 polyamide |
| Temperature range | -40°C to +100°C |
| Minimum bend radius | 25-225mm (by diameter) |
| Reference standards | DIN 73378, DIN 74324 |
| Colors | Black (standard), blue, red, yellow |
| Custom lengths | Cut to order |
Working Pressure by Size
| Outer diameter | Inner diameter | Working pressure |
|---|---|---|
| 4mm | 2mm | 91 bar |
| 6mm | 4mm | 56 bar |
| 8mm | 6mm | 40 bar |
| 10mm | 8mm | 31 bar |
Note how the rating falls as diameter grows: the 4mm size carries 91 bar while the 10mm size is rated at 31 bar. Always size from this table, not from a general range.
Choosing a Size
Match three things: the system pressure, the flow the line must carry, and the routing space. The 4mm size suits short runs feeding a small number of points and is covered in detail on the 4mm nylon pipe page. The 6mm size is the common choice for standard lubrication lines and has its own page at 6mm nylon pipe. The 8mm and 10mm sizes serve higher-volume main lines. Keep the system’s working pressure below the rating of the size you select.
Fittings and Installation
Polyamide pipe works with both push-in and compression fittings. Push-in fittings are the fastest to assemble; compression fittings give a more mechanically secure joint – tighten them firmly but do not over-tighten, since excessive torque can distort the tube. Cut the pipe square, respect the minimum bend radius of 25-225mm depending on diameter, and support long runs so the pipe cannot chafe or whip under pressure pulses.
Applications
- Trunk and branch lines in centralized oil and grease lubrication systems
- Machine tools, presses, and production-line equipment
- Color-coded circuits: blue, red, or yellow pipe identifies separate systems at a glance, with black as the standard
- General pneumatic and hydraulic auxiliary lines within the stated ratings
Maintenance and Limits
Polyamide pipe needs little routine attention, but inspect runs periodically for kinks, chafing at contact points, and any section bent tighter than its minimum radius – such sections should be replaced. Stay within the -40°C to +100°C window; the +100°C figure is a continuous-service ceiling, not a surge allowance. The material resists oils, greases, and most industrial media, but it is not resistant to concentrated acids and certain solvents – if the line will see aggressive chemicals, confirm compatibility first.
Pipe is supplied in standard colors and can be cut to the lengths your layout needs. Send your sizes and quantities through our pipe quotation form for a cut-length order.
Frequently Asked Questions
What is a high pressure polyamide lubrication pipe?
It is a rigid nylon tube made from PA11 or PA12, used to carry lubricant under pressure in centralized lubrication systems. It routes like pipe but is light and corrosion-free compared with metal tube.
What sizes and pressure ratings are available?
Four sizes are listed: 4mm x 2mm at 91 bar, 6mm x 4mm at 56 bar, 8mm x 6mm at 40 bar, and 10mm x 8mm at 31 bar. Working pressure decreases as diameter increases, so always check the per-size table.
Should I choose 4mm, 6mm, or 8mm?
Choose by pressure first, then flow. High-pressure or short precision runs point to 4mm; standard lubrication lines usually run 6mm; higher-volume mains use 8mm or 10mm. The 4mm and 6mm sizes have dedicated pages linked above.
How does polyamide pipe differ from a hydraulic hose?
Polyamide pipe is a rigid thermoplastic tube for fixed routing in lubrication systems; a hose is a flexible, reinforced line for movement or vibration. Where flexibility is required, see the high pressure hose range instead.
What temperature range does it cover?
-40°C to +100°C, with the upper figure as the continuous-service limit.
Which fittings should I use?
Push-in fittings for speed, compression fittings for a mechanically secure joint. With compression fittings, tighten firmly but avoid over-tightening, which can distort the tube.
What bend radius do I need to respect?
Between 25mm and 225mm depending on pipe diameter. Never force a tighter bend – a kinked section loses pressure capability and should be replaced.
What colors are available?
Black is standard; blue, red, and yellow are used for system identification on machines with multiple circuits.
Are there chemical limits?
Polyamide resists oils, greases, and most industrial fluids, but not concentrated acids or certain solvents. Check compatibility before routing aggressive media.
Who do I contact for cut lengths and pricing?
IsoHiTech Lubrication Systems was founded in 2023, engineering since 2006, and supplies lubrication tubing, fittings, and system components. Request a cut-length quote with your sizes, or email inquiry@isohitech.com.
