The 6×1.5 PA12 tube is a mid-size nylon distribution line for single-line oil and grease lubrication circuits. The code reads outside diameter by wall: 6 mm OD, 1.5 mm wall, about 3 mm inside. This page covers the stiffness grades, pressure and temperature behavior, media, and supply formats. For a lower-pressure oil line in the same 6 mm OD (6×4 format), see the 6 mm nylon tubing page; for the pump-to-distributor main feed, use the 11.2×6.3 main feed tube page; for a coiled form, use the helical coil tube page.
Where This Tube Sits in the Line
A main feed joins pump and metering unit; each point is fed through a branch line, and this tube is that branch line. Typical uses are CNC machines, production lines, conveyors, pumps, and progressive distributor manifolds, plus trucks, construction machinery, and agricultural machinery.
| Tube | Position in the circuit |
|---|---|
| 4 mm OD nylon tube | Fine branch and instrument lines |
| This 6×1.5 tube | Mid-size branch line |
| 11.2×6.3 tube | Pump-to-distributor main feed |
Construction, Color, and Sizing
The tube is a single-wall PA12 polyamide extrusion in black or transparent; black suits runs exposed to light, transparent shows the fill state. Sizing follows the DIN 73378 dimensional convention. The 6 mm OD carries a 0.1 mm tolerance; weight is about 2.25 kg per 100 m.
Three Stiffness Grades
Three grades are stocked; they share the same pressure and temperature behavior and differ only in bending and shape retention.
| Grade | Stiffness | Routing character |
|---|---|---|
| HL | Semi-rigid | Holds routed shape |
| PHL | Flexible | Easiest bending on crowded machines |
| PHLY | Semi-flexible | Between the other two |
Pressure and Temperature Limits
The working range is 70 – 100 bar at 23°C, set against a 200 bar burst rating. The burst figure is an upper limit, not an operating target. Coverage runs from -60°C to +80°C; some formulations extend to +120°C, and most lubrication applications stay inside -40°C to +80°C. The ceiling falls as temperature climbs; confirm your figure when ordering.
Media Compatibility
The tube handles mineral oil, synthetic oil, grease, and fuel, and contains no plasticizer, so nothing migrates into the lubricant. One rule overrides everything: oil and grease never share one line, because residue disturbs metering at the outlet; run separate, marked lines.
What Is Supplied
Two reels are standard: 56-NM06-100, the 100 m empty reel, and 56-NMF06-025, the 25 m pre-greased reel (TUBE PA12HL 6×1.5 FILLED). The pre-greased reel ships with NLGI 000 grease for cold-weather starts and long runs, or NLGI 2 for standard service; a customer-specified grease is possible. Confirm both when ordering.
Honest Limits
Four boundaries apply.
- Pressure: the working range is 70 – 100 bar at 23°C. A main feed at higher working pressure belongs on the 11.2×6.3 main feed tube page, not on this tube.
- Temperature: sustained service above +120°C exceeds even the extended formulations; use metal tubing.
- Chemical: concentrated acids, strong oxidizers, and chlorinated solvents attack PA12; those media need metal tubing.
- Routing: minimum bend radius is 18 mm, about 3x the OD; do not kink the tube into tighter bends.
Send us your line plan and we will confirm grade, color, and fill.
Frequently Asked Questions
What does 6×1.5 mean?
It reads outside diameter by wall: 6 mm OD, 1.5 mm wall, about 3 mm inside. For lower-pressure oil lines in the same 6 mm OD, go to the 6 mm nylon tubing page before ordering.
How do HL, PHL, and PHLY differ?
HL is semi-rigid, PHL is flexible, PHLY is semi-flexible; pressure and temperature behavior is identical, so choose by bending and shape retention.
Can one tube carry both oil and grease?
No. Oil and grease must never share one line; residue disturbs metering at the outlet. Run separate, marked lines.
How do burst rating and working range relate?
It is a short-duration burst rating, an upper limit, not an operating pressure. The working range at 23°C is 70 – 100 bar, falling as temperature climbs; confirm your figure when ordering.
What is the minimum bend radius?
18 mm, about 3x the OD. A tighter bend can kink the tube and throttle or block the line.
When is the pre-greased version the right choice?
When the first charge must arrive at the outlet soon after the pump starts; the reel ships packed with NLGI 000 grease for cold-weather starts and long runs, or NLGI 2 for standard service.
How do I choose within the tube family?
This tube is the branch line from a metering outlet to one point or a small group. The 6×4 nylon tubing covers lower-pressure oil lines in the same OD; the main feed tube covers the pump-to-distributor run, and that code reads OD by ID.
What does the DIN 73378 reference mean?
It is the dimensional standard this family is sized against, covering polyamide tubing OD and wall combinations; it describes sizing, not performance.
How do I cut and install the tube?
Cut with a sharp tube cutter to a clean, square end; ragged ends seat poorly in push-in fittings. The 1.5 mm wall needs no liner. For grade, color, and fill, send us your circuit details.
What company supplies this tube?
IsoHiTech Lubrication Systems is a lubrication equipment supplier founded in 2023, engineering since 2006. For grade, color, and reel format, write to inquiry@isohitech.com or use the contact page.
