I believe it's 0.020 Inch. For example a 14MM bolt head is 0.020" smaller than a 9/16" and 15MM is 0.020" bigger than 9/16". Think of them as in-between sizes of each other.
There is no difference between 863 bronze and SAE 863 bronze - they refer to the same material. SAE 863 bronze is designated by the Society of Automotive Engineers (SAE) and is also known as 863 aluminum bronze or C86300 bronze.
Check out this URL: http://www.upmpg.com/tech_articles/motoroil_viscosity/ I believe your question will be answered there.
SAE 10W could be using in larger of range temperature, so SAE with W character also means suitable for winter season as well as tropical season or ambient temperature. this SAE 10W also means multi grade oil. thanks
SAE 10w30 is better for lower temp and SAE 20w40 is the opposite better hotter temps.Thanks
20w-50 indicates Synthetic-oil
Sea salt is mostly sodium chloride, but it contains a variety of other substances as well.
The weight of the oil when it is cold. The 15w is a thicker oil than the 10w when it is cold.
What is the different between NAS & SAE.
The primary difference between SAE 10W-30 and SAE 10W-30 Sigma typically lies in the formulation and additives used in the "Sigma" variant. While both oils have the same viscosity ratings and base oil properties, "Sigma" may indicate a specific brand or product line that includes enhanced performance characteristics, such as improved wear protection, cleaning agents, or better thermal stability. Always refer to the product specifications and recommendations for the best application.
SAE is American or standard thread and metric is everything else. The size or diameter is different and the pitch of the thread is different also.
SAE 50 is a single weight oil that is 50 weight when cold or hot. SAE 20w50 is a multi-grade oil. When cold it flows as a 20 weight oil and therefore flows much easier. At full operating temperature it flows as a 50 weight oil. The W stands for winter.
Sae.en