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How to Read a Gear Oil Viscosity Chart. This comparative viscosity chart can help determine if two or more lubricants have similar viscosities.
Find viscosity tables and charts for gear oil at multiple temperatures (viscosity and density values with their source).
Viscosity Charts. Viscosities based on 96 VI single grade oils. specified at low temperature. SAE 90 to 250 and 20 to 50 specified at 100°C. Many petroleum products are graded according to the ISO Viscosity Classification System, approved by the international standards organization (ISO).
Viscosity – Often referred to as the most important property of a lubricating oil. Additives – The additive package used in the lubricant will determine the lubricant’s general category and affects various key performance properties under operating conditions.
But how do you read a gear oil viscosity chart? Just read it horizontally. For example, an SAE 60 motor oil has a similar viscosity to an SAE 90 gear oil, an AGMA 6 gear lubricant and an ISO 320 hydraulic fluid/gear lubricant.
Use our oil viscosity comparison chart to identify and reference thickness at different temperatures for engines and machinery for ISO VG, AGMA, SAE Auto, and SAE Gear lubricants.
How to Read a Gear Oil Viscosity Chart. This comparative viscosity chart can help determine if two or more lubricants have similar viscosities. Viscosity, defined as a fluid’s resistance to flow, is one of the most important characteristics of a lubricant.
Gear lubricant must possess the following characteristics: Good viscosity is essential to ensure cushioning and quiet operation. An oil viscosity that is too high will result in excess friction and degradation of oil properties associated with high oil operating temperature.
There are SAE (Society of Automotive Engineers) grades for gear oils and crankcases (engines), AGMA (American Gear Manufacturers Association) grades for gear oils, SUS (Saybolt Universal Seconds), cSt (kinematic viscosity in centistokes), and absolute viscosity.
The American Gear Manufacturing Association (AGMA) includes in their standard 9005-D94 the kinematic viscosity and performance requirements for closed industrial gearboxes. The viscosity ranges for AGMA lubricant numbers correspond with those of ASTM D2422 and ISO 3448.
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