Honing Oils

Honing oil for honing machines and fine grinding: EASYCUT NHO051, a low-viscosity neat oil (ISO 5) for honing cylinders, bores and liners in cast iron, alloy and carbon steel and titanium alloys. Chlorine-free, low in aromatics, used undiluted as both lubricant and honing coolant.

In stock in Canada in 5-gallon pails and 55-gallon drums. Order online 24/7, no quote needed.

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EASYCUT NHO051 Honing and Grinding Oil ISO 5, 55 Gallon Drum

NHO051-55Made to order

CA$1,505.36

excl. taxes

What honing oil does

Honing removes very little metal, with stones that cut through thousands of fine abrasive points at once. Honing oil has three jobs there: keep a thin film between stone and bore so the abrasive cuts instead of smearing, carry the heat away, and wash the fine swarf and spent grit out of the stone before it clogs. Because the gaps are tiny, the oil has to be very thin — NHO051 is 5 mm²/s at 40 °C, less than half the viscosity of a typical light cutting oil.

This page is about industrial honing oil for honing machines, sold by the pail and the drum. For sharpening knives and chisels on a bench stone, a small bottle of light mineral oil is what you need.

What a honing oil problem looks like

The stones glaze and stop cutting. The pores are filled with swarf. Usually dirty oil or poor filtration; sometimes an oil too thick to flush the stone.
The finish is rough or the crosshatch is uneven. Coarse particles are circulating back into the bore. Check the filter before blaming the stones.
Bore size drifts through the shift. The oil is warming up, and the part with it. Keep the oil temperature stable so the size you measure is the size you get.
Oil mist and smell around the machine. Thin oils mist more. NHO051 is low in aromatics, which helps; a mist collector on the machine does the rest.

Honing oil as coolant and lubricant

Although it is called honing oil, the fluid works as the honing coolant too: one neat oil cools, lubricates and cleans. Water-based coolants are used on some honing machines, but neat oil gives the more consistent finish and protects the stones better, which is why most cylinder honing runs on oil.

Applications

Cylinder honing: hydraulic and pneumatic cylinders, engine blocks and liners
Honing of bores and tubes in cast iron, alloy and carbon steel
Titanium alloy parts
Fine grinding with neat oil

Keeping honing oil in service

Filter fine. Honing makes very small particles, and they finish the bore if they stay in the oil.
Keep coolant and hydraulic oil out of the tank — both change how the oil behaves at the stone.
Topping up with another mineral-based honing oil of similar viscosity is usually fine. Test first: mix a little of both in a clear jar and wait 24 hours. No separation means they can go into the machine together.
Unopened, NHO051 keeps for 24 months stored between 5 and 40 °C.

FAQ

Looking for cutting oils or coolants? See all metalworking fluids.

What honing oil does

This page is about industrial honing oil for honing machines, sold by the pail and the drum. For sharpening knives and chisels on a bench stone, a small bottle of light mineral oil is what you need.

What a honing oil problem looks like

The stones glaze and stop cutting. The pores are filled with swarf. Usually dirty oil or poor filtration; sometimes an oil too thick to flush the stone.

The finish is rough or the crosshatch is uneven. Coarse particles are circulating back into the bore. Check the filter before blaming the stones.

Bore size drifts through the shift. The oil is warming up, and the part with it. Keep the oil temperature stable so the size you measure is the size you get.

Oil mist and smell around the machine. Thin oils mist more. NHO051 is low in aromatics, which helps; a mist collector on the machine does the rest.

Keeping honing oil in service

Filter fine. Honing makes very small particles, and they finish the bore if they stay in the oil.

Keep coolant and hydraulic oil out of the tank — both change how the oil behaves at the stone.

Topping up with another mineral-based honing oil of similar viscosity is usually fine. Test first: mix a little of both in a clear jar and wait 24 hours. No separation means they can go into the machine together.

Unopened, NHO051 keeps for 24 months stored between 5 and 40 °C.