Overview
This 4mm nylon pipe is a flexible tubing line for centralized and automatic lubrication systems. It connects lubricant distributors to individual lubrication points on CNC machines, presses, conveyors, and similar equipment, where lines must route through tight spaces. The 4 mm outer diameter is the common choice for these secondary distribution lines.
Made from Nylon 12 (PA12 HL), it has a declared working pressure of 25 bar (approx. 363 PSI) and a declared burst pressure up to 70 bar (about 1,000 psi). It covers -35°C to +70°C (some applications up to 93°C) with a 10 mm minimum bend radius. Working pressure and burst pressure are different values; select by working pressure, not burst figures.
Declared Specifications
| Parameter | Declared Specification |
|---|---|
| Material | Nylon 12 (PA12 HL) |
| Outer Diameter (OD) | 4 mm |
| Inner Diameter (ID) | 2.3-2.7 mm |
| Working Pressure | 25 bar (approx. 363 PSI) |
| Burst Pressure | up to 70 bar (about 1,000 psi) |
| Temperature Range | -35°C to +70°C; some applications up to 93°C |
| Minimum Bend Radius | 10 mm |
| Size Reference | DIN 73378 (common for PA12 HL tubes) |
| Colors | natural, black, red, blue, green, brown |
Selection and Working Principle
In a centralized lubrication system, a pump pushes oil or grease through distribution lines to metering devices or directly to bearings and chains. The 4mm nylon pipe serves as the secondary line, taking lubricant from a distributor outlet to the point of use. Its 2.3-2.7 mm inner diameter keeps the line light and flexible while matching typical system flow.
Match three things when selecting: line working pressure against the 25 bar rating, ambient temperature against the -35°C to +70°C range, and fitting type at each end. The pipe is intended for push-in and compression fittings of matching size. For longer feed runs to remote points, pre-assembled remote grease line kits with compression fittings may be simpler.
The pipe comes in natural, black, red, blue, green, and brown, so different circuits or lubricant types can be told apart on a crowded machine.
Installation and Use
Cut the pipe square and remove burrs before assembly; a square end seats correctly in push-in and compression fittings. Keep bends at or above the 10 mm minimum bend radius, since sharper bends can kink the line and restrict flow. Leave slack where the line meets moving parts.
Support the line so it does not rub against sharp edges or hot surfaces; replace sections showing abrasion, cracking, or permanent flattening. For threaded metal hardware, brass straight fittings bridge the nylon line and the component.
Applications
- Centralized and automatic lubrication systems on production machinery
- CNC machine tool lubrication for bearings, ways, and moving parts
- Press and stamping equipment lubricant feed lines
- Conveyor systems, including chains and drive bearings
- Mining and outdoor equipment lubrication points
- Automotive assembly and transfer line lubrication
Maintenance
Periodically check the pipe for abrasion, kinking, hardening, or swelling at fittings, and check connections for seepage. Replace damaged sections as found. If flow at a point drops, check the route for sharp bends or partial blockage before assuming a pump problem. For volume requirements or application-specific selection, request a quote through our contact page.
FAQ
What is 4mm nylon pipe used for in a lubrication system?
It is a secondary distribution line carrying oil or grease from a lubricant distributor to individual lubrication points. Its 4 mm OD and flexible PA12 body suit the compact routing of centralized and automatic systems.
What is the difference between working pressure and burst pressure here?
Working pressure, 25 bar, is what the pipe handles in service. Burst pressure, up to 70 bar, is a higher figure from burst checks, not an operating rating. Select against the 25 bar working value.
What temperature range can this pipe handle?
The declared range is -35°C to +70°C for normal use. Some applications are rated up to 93°C, but 70°C is the standard upper limit, so keep lines clear of hot equipment.
Can I bend the pipe around tight corners?
Yes, within limits. The stated minimum bend radius is 10 mm; tighter bends can kink the pipe and restrict lubricant flow.
How do I connect this pipe to lubrication components?
Use push-in or compression fittings sized for 4 mm tubing. Cut the pipe square, deburr, and insert it fully into the fitting. For threaded metal hardware, brass straight fittings bridge the nylon line and the component.
Does the pipe work with both oil and grease?
Yes. PA12 serves both oil and grease lines. Selection comes down to working pressure, temperature, and fitting type, all covered in the declared specifications above.
How do I choose between 4mm and 6mm nylon pipe?
4mm tubing is the standard for secondary lines from distributors to lubrication points. 6mm tubing is the usual choice for main feed lines where more flow is needed. See the 6mm nylon pipe page for that size.
What do the color options indicate?
The pipe comes in natural, black, red, blue, green, and brown. Colors carry no performance difference; they help identify circuits or lubricant types on complex machines.
Which standard describes the tube dimensions?
The sizes follow DIN 73378, the dimension standard commonly used for PA12 HL lubrication tubing, so the pipe matches common push-in and compression fittings.
Who makes this 4mm nylon pipe?
It is produced by IsoHiTech Lubrication Systems, founded in 2023, engineering since 2006. For application questions or a quotation, contact our team for a quote or email inquiry@isohitech.com.
