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SAE is an acronym for the "Society of Automotive Engineers" and when used in conjunction with tool grade or measurement (not oil), is a standardized unit of non-metric measurement. Simply put, in measurements it means "Non-Metric". The name "SAE" used to grade motor oil has a totally different meaning, although instituted by the same society.
Manufacturers mix various oils to make an 'SAE 40' oil product. Such a mixture will not have a molecular weight.
SAE stands for Society of Automotive Engineers. Sae ratings pertain to the oils Viscosity. Viscosity is the flowability (resistance to flow) at a particular temperature.
What is fulform of SAE 40 oil.SAE - Society of Automotive Engineers for further details check out: http://www.performanceoiltechnology.com/saeviscosityclassificationsandmanf.requirements.htm
Grades R and RM Hose Are Recommended For Use With Acetylene Gas only. Grade R features a non oil resistant and a non flame resistant tube and cover. Grade RM features a non oil resistant and a non flame resistant tube with an oil resistant and flame resistant cover. Grade T Welding Hose Is Safe For Use With All Fuel Gases Including Acetylene. Grade T features an oil resistant and flame resistant tube and cover.