SAE J475 is a specification for thread sizes on tubing. 38 may be a typographic error for a 3/8" thread.
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Sae-20w
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.
The full form of SAE is Society of Automotive Engineers.
It depends on how the steel is heat treated, so there isn't a single answer.
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.