What This Tubing Is
Part number 111-35114-1 is high-pressure tubing made from TPU (thermoplastic polyurethane), built for centralized lubrication systems that move grease or oil to bearings, gears, and chains. It is the flexible branch of a three-material tubing family; the semi-rigid nylon line and the steel-braided hose have their own pages, and this page covers the TPU branch only.
Three measurements drive every tubing choice. The outside diameter, 8.6 mm here, decides which compression fittings and couplers fit. The wall thickness, 2.3 mm, carries the pressure load. The inside diameter, 4.0 mm, sets how much grease or oil passes through the line. Buyers pick fittings by outside diameter but judge flow by inside diameter, so read the trio together before ordering.
Specifications
| Item | Value |
|---|---|
| Part number | 111-35114-1 |
| Material | TPU (thermoplastic polyurethane) |
| Outside diameter | 8.6 mm (+0.15/-0.1 mm) |
| Wall thickness | 2.3 mm (+/-0.1 mm) |
| Inside diameter | 4.0 mm (+/-0.1 mm) |
| Maximum operating pressure | 350 bar (5,075 psi) |
| Temperature range | -40°C to +70°C |
| Minimum bend radius | 35 mm |
| Weight | 55 g per meter (5.5 kg per 100 m) |
| Standard roll | 50 m |
| Supply condition | Unfilled, or pre-filled with grease on request |
These values describe the tubing alone; a complete line also includes fittings, couplers, and a pump, each with its own rating.
TPU, Nylon, or Steel-Braided
Pick the material by routing, not habit. TPU follows tight corners and absorbs vibration, so it suits machinery interiors where lines track moving assemblies. Semi-rigid PA12 nylon holds long straight runs where stiffness helps alignment. Steel-braided hose covers the highest pressures and sections exposed to mechanical damage.
The three material pages stay separate so each keeps its own pressure rating, bend behavior, and fitting data; this page publishes TPU numbers only. For a worked method that walks the full tubing and hose decision, see the lubrication tubing and hose selection guide.
Bend Radius, Routing, and Cold Weather
The minimum bend radius is 35 mm. A tighter bend kinks the wall and collapses the 4.0 mm bore, which restricts grease flow, so treat 35 mm as the floor at every corner and plan runs around obstacles rather than through them.
The rated temperature range runs from -40°C to +70°C, so the line stays in service in unheated plants and outdoor equipment through winter. At the top end, route the line clear of heat sources above 70°C. In cold shops, leave a little slack at each end so machine movement does not pull the line straight.
Cut, Fit, and Support
Cut the tube with a sharp tube cutter so each end comes out square; ragged or angled ends seat badly in compression fittings. Use compression fittings rated for the full working pressure of the line.
Match the fitting to the 8.6 mm outside diameter and confirm thread and connector patterns against the port before ordering; the grease line tubing and fittings selection guide and the grease fitting types guide walk through that match. Support the line every 0.5-1 m so a long run cannot sag, and keep it clear of heat sources above 70°C. Where a fitting uses an elastomer seal, confirm seal compatibility with the fluid data sheet before ordering. Tube cutters, clamps, and related hardware are listed under lubrication accessories.
Filled or Unfilled, and Ordering
Standard supply is unfilled, with the bore empty and ready to prime on site. On request the tubing is supplied pre-filled with grease, which removes the priming step on long runs; note the fill condition when ordering.
A standard roll holds 50 m. The line weighs 55 g per meter, or 5.5 kg per 100 m, which helps when planning overhead runs and support spacing. Volume orders can be cut to custom lengths; confirm the lengths when ordering. Send the needed lengths and fill condition through the contact for a quote page, and supply details will be confirmed before cutting.
Frequently Asked Questions
What is this tubing?
It is a TPU high-pressure tubing line, part number 111-35114-1, sized 8.6 mm outside diameter with a 2.3 mm wall. It feeds grease or oil in centralized lubrication systems.
How do the three sizes relate?
The 8.6 mm outside diameter picks the fittings, the 4.0 mm inside diameter sets flow, and the 2.3 mm wall carries pressure. Read all three together, because a fitting match with a choked bore still starves the lube points.
How does TPU compare with nylon and steel-braided line?
Choose TPU for tight bends and vibration, PA12 for long straight runs, and steel braid for the highest pressures. This page holds TPU data only; the sibling pages publish the nylon and steel-braided specifications.
What pressure can this tubing carry?
Maximum operating pressure is 350 bar, or 5,075 psi. Every fitting and component must be rated at or above the pump maximum, since the line works at its lowest rated component.
How tight can this tubing bend?
The minimum bend radius is 35 mm. Tighter bends collapse the 4.0 mm bore and restrict grease flow, so treat 35 mm as the floor at every corner.
Can it run grease or oil lines?
TPU resists most hydraulic fluids, lubricating oils, and water-based solutions, so both grease and oil service are possible. For a specific fluid, confirm compatibility against the fluid data sheet before ordering.
Does the tubing come pre-filled?
Standard supply is unfilled, with the bore empty for on-site priming. It can be supplied pre-filled with grease on request; note the fill condition when ordering.
How does it behave in cold weather?
The rated temperature range runs from -40°C to +70°C, so the line serves unheated plants and outdoor equipment in winter. In cold routing, leave slack at each end so machine movement does not pull the line straight.
What roll length is standard, and are custom cuts available?
The standard roll is 50 m, and volume orders can be cut to custom lengths. Confirm required lengths when ordering through the contact page.
Who makes this tubing, and how do I request a quotation?
IsoHiTech Lubrication Systems, founded in 2023, engineering since 2006, builds and supports every unit. Email inquiry@isohitech.com for specifications and a quotation.
