🔍 Key Concepts

• NLGI grade numbers and consistency – how the scale runs from very fluid to very stiff greases • Typical multipurpose bearing and machinery grease used on marine equipment like winches, motors, and deck machinery • Difference between semi-fluid grease (for gearboxes) and very stiff grease (for special heavy-load, low-speed uses)

💭 Think About

• Think about which NLGI grade is considered a common "general purpose" chassis/bearing grease in many industries, including marine. • Ask yourself: if grease is too thin, what problems might it cause in bearings and fittings? If it is too thick, what problems might it cause when pumping through grease guns or reaching moving parts? • Which NLGI number is most often recommended for standard rolling-element bearings and general deck machinery lubrication under normal temperatures?

✅ Before You Answer

• Verify the direction of the NLGI scale: does a higher number mean softer or stiffer grease? • Check which NLGI grade is commonly used as a multipurpose, all-around grease in maintenance manuals. • Eliminate grades that are mainly used for special applications such as gearboxes needing semi-fluid grease or extremely low-speed, heavily loaded bearings.