Grease Viscosity - Consistency, Penetration, and NLGI Grade Numbers.
Grease Viscosity

Grease Density and Specific Gravity.
Grease Density

An easy to use on-line calculator to find the volume and surface area of common 3-D Shapes.
Volume Calculator

Once you have the volume, you may need to convert it into different Units. Here is an easy calculator to do just that.
Volume Converter

An easy to use on-line calculator to find the area of common 2-D Geometric Shapes.
Area Calculator

Machining Data for Socket Head Cap Screws - Inch and Metric
Socket Head Cap Screws

A chart of the common English and Metric Tap Drill Sizes.
Tap Drill Chart