Portals

These websites contain information about companies, parts, or materials.

• Fabricating.com — (Website has displayed a placeholder for some time; they may be offline.)
• Fasteners Clearing House Sourcing Network — Search for parts manufacturers and distributors currently have in stock.
• Industrial Fasteners Institute — Manufacturer Search
• ThomasNet® — Product sourcing and supplier discovery platform
• TSF Global Fastenting Solutions — (Spain)
• Zycon — Industrial directory, engineering resource, and vertical search engine

These websites contain information about parts and applications.

• ASTM Steel Standards
• Comparison of Tool Steel Standards and Specifications — from West Yorkshire Steel
• Engineer's Edge
• European Steel and Alloy Grades/Numbers — Free steel alloy database.
• Fasten.it Technical Data — Database with technical specifications of the products and comparison among DIN, ISO, UNI, AFNOR, EN norms.
• MatWeb — Material propery data
• Octopart — Search engine for electronic parts
• Steel Grade Equivalent — from DFW Machine
• TraceParts — A huge choice of 2D & 3D CAD files, models and drawings.
• Trace Parts Online — Free 2D & 3D CAD files, models and drawings of mechanical, electrical & mechatronics part catalogs

• ASSIST Quick Search — Database of military specifications.
• Volvo Standards

• Irvan-Smith Technical Information ( "How to Measure a Rivet" is highly relevant.)

• Elsmar Forums — ISO Q&A, engineering questions, general business practices.
• Finishing.com — Questions and answers about finishing; they also have a technical library which is useful.