What a Tube Spring Cover Is
A tube spring cover is a close-wound coil that wraps a small-diameter tube or hose. The coil takes the rubbing, crushing, and dirt that would otherwise cut into the line’s outer wall, so the line underneath keeps its wall thickness. It is a protection layer, not a pressure component, and it earns its place on any machine where lines cross moving edges or sit in dirty zones. Spring covers work alongside the dispensing and transfer lines in the grease pump hose family: that page rates the lines, this page protects them.
Models and Specifications
Two steel sizes cover the common small-bore tubing, and the plastic spiral guard covers the wider range.
| Model | Material | Inner diameter | Sized for | Supply length |
|---|---|---|---|---|
| TSG-4 | stainless steel | 4 mm | 4 mm nylon tubing | 4 m per piece |
| TSG-6 | stainless steel | 6 mm | 6 mm nylon tubing | 4 m per piece |
| Plastic spiral guard | PVC or polypropylene | 8-200 mm | light-duty lines and hose bundles | various lengths |
The steel covers come as straight coils you cut to length; the plastic guard wraps around the line and also bundles several lines into one neat run.
Sizing to Your Line
Sizing is by the outside diameter of the line, never the inside. Measure the tube or hose OD with calipers, then pick a cover with an inner diameter slightly larger than the measurement. The cover should slide on without forcing; a cover driven on with tools is too small and will pinch the line underneath. If the measured OD falls between stocked sizes, send the measurement through the contact page before ordering.
Stainless Steel or Plastic Spiral
Stainless steel suits the hardest wear: heavy rubbing points, machine interiors where chips and links drag across lines, and washdown areas where the cover itself gets scraped and wetted. Plastic spiral guard in PVC or polypropylene suits lighter duty, weight-sensitive spots, and bundling several lines that share one run. Plastic also covers the larger 8-200 mm sizes where a steel coil would be impractical. Both types cut to length on the bench, so one piece protects several fittings on a manifold.
Installation and Cutting
Fitting order matters. A closed coil cannot pass a crimped fitting, so on a new line slide the cover on before the fittings go on. On an existing line, wind the coil on from one end. Both types cut to length with standard cutters; cut square and dress the cut end on steel so the sharp edge does not score the line it protects. The line itself still needs correct tube selection and routing, which the tubing and hose selection guide and the grease line tubing and fittings guide cover in detail.
What a Spring Cover Is Not
A spring cover is not a burst-whip restraint. If a line can whip on failure, fit a dedicated restraint rated for that duty. It is not a stiffener: it does not support the line, prevent bending, or hold a shape, so bend control still comes from correct tube choice and routing. And it is not a reason to stop inspecting the line underneath. The high-pressure hose page rates the lines used in progressive lubrication systems and across the grease pump range, and those lines get inspected on condition. Replace a cover that is crushed, corroded, or unwound; that is a condition call, not a calendar entry.
Frequently Asked Questions
What is a tube spring cover?
It is a close-wound coil that wraps a small-diameter tube or hose. The coil takes rubbing, crushing, and dirt so the line keeps its wall.
Which size do I need?
Measure the outside diameter of the tube or hose. TSG-4 fits 4 mm nylon tubing, TSG-6 fits 6 mm, and plastic guard covers 8-200 mm.
Steel or plastic?
Steel suits heavy rubbing points, machine interiors, and washdown areas. Plastic suits lighter duty, weight-sensitive spots, and bundling several lines together.
Can it be cut to length?
Yes. Both types cut to length with standard cutters; cut square and dress the cut end on steel.
Can it go on an existing line?
Yes, wind the coil on from one end of an installed line. On new builds, slide the cover on before the fittings go on.
Will it stop the tube bending?
No, a spring cover gives protection without stiffening and does not support the line. Choose the right tube wall and routing for bend control.
Does it protect against bursts?
No, a spring cover is not a burst-whip restraint. Fit a dedicated restraint wherever whip containment is required.
How long does a cover last?
There is no fixed interval. Replace a cover that is crushed, corroded, or unwound, and check the line underneath at the same time.
Where are covers most needed?
Prioritize crossings, moving edges, step zones, and boom and arm bend zones. List your problem spots through our contact page for sizing help.
Who builds these covers?
IsoHiTech Lubrication Systems, founded in 2023, engineering since 2006, builds and supports every unit. Email inquiry@isohitech.com for specifications and a quotation.
