Viscosity classification guide
Fluids
Practical notes for choosing viscosity without mixing ISO VG, SAE, and lubricant grade systems.
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Lubricant Viscosity Selector
Recommends ISO VG based on ks/v factor and lubrication method; adjusted by speed and temperature.
Lubricant Viscosity Selector
Recommends ISO VG from ks/v and lubrication method. At high speed with jet/spray, lower VG may be selected; for high ks and low speed, higher VG may be needed.
Recommended ISO VGVG 100
Alternative rangeVG 68 - VG 150
ks/v factor2.08
MethodSplash
Speed v [m/s]12.00
Target oil T [°C]70.0
The ks/v approach is aligned with DIN/ISO-style lubrication selection logic. For high speed with spray/jet, one lower VG may be chosen; for splash/oil bath with high ks and low speed, one higher VG may be chosen. If temperature is above 85 °C, prefer one higher VG. Use your own detailed tables for final selection.
Standard Documentation
Gear Oil ViscosityScope: What does this tool calculate?
Gear Oil Viscosity performs the core engineering calculation for this tool type and presents results in a traceable format.
Assumptions and Units
- SI units are the baseline; input unit consistency must be verified by the user.
- The calculation path is deterministic (same inputs = same outputs).
- If default material/environment values are used, replace them with project-specific values.
Limits / Boundaries
- This tool is intended for preliminary sizing and technical checks, not final design approval.
- When inputs are outside expected ranges, validate input quality before interpreting outputs.
Reference Standard
- ISO / DIN / VDI references and common engineering handbooks
Validation Example
Validation example
| Input | Expected Output |
|---|---|
| Input set: Unit-consistent project values | Expected output: Tool result is in the same order as standard references |
Note: In real projects, run at least one manual check or reference-table comparison.
Version and Update
- Version
- v0.1.0
- Last updated
- 2026-03-04
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