High-Pressure Lubrication Hose for Centralized Grease & Oil Systems
Quick Answer: High-pressure lubrication hose transmits grease or oil from the pump to divider valves and bearings at 10–28 MPa working pressure. For mining, construction, and steel applications, choose a steel-braided hose with a burst pressure at least 3× the working pressure.
Featured product: 8.6×4 mm steel-braided hose — 80 MPa burst / 28 MPa working.
What Is a High-Pressure Lubrication Hose?
A high-pressure lubrication hose carries grease or oil from a central pump or manifold to remote bearing points in a centralized lubrication system. Unlike low-pressure oilers, these hoses must resist ballooning under pressure, withstand vibration and abrasion, and maintain a small bend radius for routing around machinery. ISOHITECH is a lubrication systems manufacturer with 25+ years of experience supplying automatic lubrication pumps, progressive distributors, and complete centralized systems for construction, mining, wind energy, and industrial machinery.
Steel-Braided vs. Nylon Tubing
| Feature | Steel-Braided High-Pressure Hose | PA12 Nylon Tubing |
|---|---|---|
| Typical working pressure | 28 MPa (4,060 PSI) | 10–25 bar (145–363 PSI) |
| Burst pressure | 80 MPa (11,600 PSI) | 31–70 bar (450–1,015 PSI) |
| Best for | High-pressure grease, mining, construction | Secondary lines, oil mist, low-pressure circuits |
| Bend radius | 50 mm static / 75 mm dynamic | 10–25 mm |
| Construction | NBR tube + steel wire braid + abrasion cover | PA12 nylon |
ISOHITECH Steel-Braided Hose Specifications
| Parameter | Specification |
|---|---|
| Outer diameter | 8.6 mm |
| Inner diameter | 4.0 mm (±0.1 mm) |
| Wall thickness | 2.3 mm nominal |
| Burst pressure | 80 MPa (800 bar / 11,600 PSI) |
| Proof / test pressure | 56 MPa (560 bar / 8,120 PSI) |
| Recommended working pressure | 28 MPa (280 bar / 4,060 PSI) — 3:1 safety factor |
| Minimum bend radius | 50 mm static / 75 mm dynamic |
| Operating temperature | −40°C to +100°C (NBR); −20°C to +120°C (FKM option) |
| Compatible media | NLGI #000–#2 grease, lubricating oil, hydraulic oil |
| End fittings | Custom BSP, NPT, metric compression, JIC 37°, push-in |
| Standard coil lengths | 10 m, 25 m, 50 m, 100 m (cut-to-length available) |
Pressure Safety & Derating
- Static systems: maximum working pressure = burst pressure ÷ 3 = 28 MPa.
- Dynamic / pulsating systems: use burst pressure ÷ 4 = 20 MPa.
- Temperature derating: above +60°C, reduce working pressure by 1% per °C.
- Aging: inspect after 5 years for cover cracking, braid corrosion, or tube hardening; replace if degradation is visible.
Installation & Routing Guidelines
- Do not bend tighter than 50 mm static or 75 mm dynamic.
- Route away from sharp edges, moving parts, and surfaces above +100°C.
- Allow extra length on vibrating equipment to absorb movement.
- Use crimped fittings assembled with dies matched to the 8.6 mm OD.
- Prime the hose with grease before first operation to eliminate air pockets.
Use steel-braided hose when system pressure exceeds 25 bar, when the hose runs through abrasive or high-vibration areas, or when long runs from a central pump station to remote lube points are required. Nylon tubing is lighter and corrosion-resistant but is limited to lower pressures.
The ISOHITECH 8.6 mm OD hose can be supplied with custom-crimped BSPP (G1/8″, G1/4″), NPT (1/8″, 1/4″), metric compression, JIC 37°, or push-in (Quicklinc-compatible) ends.
Yes. The 4 mm ID handles NLGI #000 through #2 grease at working pressures up to 28 MPa. For longer runs or cold environments, consider NLGI #1 or #0 grease.
Inspect annually or every 5,000 hours. Replace hoses that show cover cracking, braid exposure, tube hardening, or reduced flexibility. In corrosive environments, replace every 2–3 years regardless of appearance.
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