Code and its significance of lubricating oil - bearing knowledge

According to GB/T7631. 1 - 1987 the provisions of the code of lubricating oil by category, variety and digital composition, its written form is: category varieties of + + number. Category refers to the classification of petroleum products, lubricant is one of the oil products, lubricating material products with L said. Variety is refers to the grouping of lubricating oil, are grouped by their applications, respectively with corresponding letters represent: A - — Total loss system; C— — Gear; D— — Compressor; E— — The internal combustion engine; F— — The stator, bearings, clutch; G— — Guide roller; H— — The hydraulic system; M— — Metal processing; P— — Pneumatic tool; T— — Steam turbine; Z— — Steam cylinder, etc. , is the first letter variety bar, actually species column also may have one or more other letters, to show the variety kinds of further subdivided. Numbers for the viscosity of the lubricating oil level, its value is equivalent to 40 ℃ ( Some are batch number, but please indicate, otherwise refers to 40 ℃) Yes middle kinematic viscosity value, the unit is was/s, according to GB/T3141 - 1994 rules 2, 3, 5, 7, 10, 15, 22, 32, 46, 68, 100, 150, 220, 320, 460, 680, 1000, 1500, 2200, 3200, a total of 20 levels. Example: L - — AN100, said viscosity grade of 100 was/s total loss of the lubricating oil system, its kinematic viscosity in 40 ℃ is 90 ~ 110 was/s, kinematic viscosity of the middle class of 100 was a/s.