PMPA Buyer's Guide - Searchable database of PMPA contract manufacturers and PMPA supplier members.
PMPA Designer’s Guide - A guide to better drawings for production.
PMPA Blog: Speaking of Precision - Knowledge Retention and Thought Leadership in
Manufacturing, Machining, and Materials.
Metal Suppliers Online's Research Tools - Instant access to periodic tables, conversion charts, size and specifications, material property data, and trade names.
MatWeb - The Online Materials Information Resource - A free online materials information resource with properties data on over 28000 materials.
Why Brass Screw Machine Parts are Cheaper than Steel by Copper Development Association. They also have case histories of screw machine products which have been converted from leaded free-machining steel to free-cutting brass available for purchase.