Understanding Screw Sizes and Conversions, PDF, Machines

ISO 724 - Metric Threads

Thread size chart, Needle and thread, Sewing thread

What are Simple Machines? Physics in Industrial Instrumentation

Chart comparing standard screw / nut / hole sizes

Bolt Depot - Printable Fastener Tools

Buyers Guide for Shoulder Screws

Simple machine Definition, Types, Examples, List, & Facts

Machinery Tables

The nuts and bolts of torque