Pick the ISO VG grade or enter viscosities at 40 and 100 °C to get viscosity at operating temperature and cold start and check it against your hydraulic pump.
Pre-sizing and estimating tool: results do not replace design, calculations or reports signed by a licensed professional, nor verification against the applicable codes and standards.
Log scale. The shaded band is the ideal viscosity for the application; dashed lines are the limits.
Compares typical ISO VG grades to pick the one inside the ideal range.
Take this page’s results to another calculator with the fields already filled in.
The report gathers this page's inputs, results, equations, assumptions and references, with fields for project, engineer and revision. In the print dialog, choose Save as PDF.
With the 40 °C and 100 °C viscosities from the data sheet, the ASTM D341 Walther equation gives viscosity at any temperature. The calculator does it and plots the curve.
Piston pumps run best between 16 and 36 cSt, with a minimum around 10 cSt and up to 1,000 cSt at start-up. Gear pumps tolerate somewhat wider ranges.
The oil is 46 cSt at 40 °C, within ±10% (41.4 to 50.6 cSt), per ISO 3448.
Important notice: Indus Metrics tools produce estimates and pre-sizing results from the data you enter and from published engineering methods. They do not replace design, calculations or reports signed by a licensed professional engineer (PE), nor verification against the applicable codes, standards and regulations, such as OSHA rules and the ASME codes. Material and fuel properties vary: check manufacturer data or your own process analyses before deciding. By using this site you agree to the Terms of Use.
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