Mobil Vactra No. 4
Mobil Vactra No. 4 is part of the Mobil Vactra Oil Numbered Series, a range of premium-quality slideway lubricants specifically developed for precision machine tools. These oils are formulated from high-quality base stocks and an advanced additive system that delivers controlled friction characteristics, coolant separability and corrosion protection. The formulation helps ensure smooth slideway movement, improved machining accuracy and extended equipment life.
One of the key advantages of Mobil Vactra No. 4 is its controlled friction performance. The advanced additive system helps reduce stick-slip and chatter across a wide range of way material combinations. This allows smooth, uniform movement and supports improved surface finish and machining accuracy.
Mobil Vactra No. 4 also provides excellent coolant separability. The oil separates effectively from aqueous metalworking fluids, helping reduce cross contamination and extend coolant and lubricant service life. The formulation also offers strong adhesiveness to maintain lubrication on critical sliding surfaces.
Another important benefit is its high load-carrying capability. Mobil Vactra No. 4 is recommended for large machine tools where way pressures are high and precision is critical. It is particularly suitable for vertical and inclined slideways where drain-down can occur. The lubricant also provides excellent rust and corrosion protection.
Mobil Vactra No. 4 is recommended for heavy-duty machine tools, vertical slideways and moderate service machine tool gear drives. It is also suitable for lubrication of ball screws, linear guides and headstocks. The oil can be applied manually, by forced-feed lubricators or by circulation systems.
Physical characteristics include ISO VG 220 viscosity grade with a kinematic viscosity of approximately 221 mm²/s at 40°C. Mobil Vactra No. 4 has a flash point of approximately 240°C and a pour point of approximately −6°C. The lubricant provides strong film strength, excellent surface protection and reliable slideway performance for heavy-duty applications.
