From The Blog

How Plastics Wear Against Metal

How Plastics Wear Against Metal
In tests mating thermoplastic composites and AISI 1141 cold-rolled steel counter-faces, the highest composite wear factors (greatest wear) resulted with the smoothest range (8-12 µin.) of metal surface finishes.  This result, contrary to what might be expected intuitively, is attributed to the adhesion-and-deformation friction mechanism of metal/plastic combinations.  The 12 to 16 µin. range yielded the lowest wear factors, and the 50 to 70 µin. surface-finish range generally produced intermediate wear-factors for most composites (unreinforced formulations were exceptions).…

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BUYING PLASTIC PARTS: The Ultimate Checklist

How to Buy Pastic Parts

by Dean West
Most of the world’s fasteners are produced from metal, but many users have switched to plastic as a better material for their application.  If you’re considering plastic fasteners… There are several pieces of information you’ll want to have to insure that you end up with what you need.
What Are The Options?
Many prospective customers contact Craftech for help in determining what options would best suit their applications. …

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History of the Screw

History of the Screw
A complete history of the screw is not available. There is historical evidence that by the first century it was used in a screw press. But screw presses  used by the Romans to squeeze olives for oil and grapes for wine have been found.  Archytas of Tarrentum is credited by the Greeks with the invention of the first screw.  However, Archimedes the Greek philosopher  is also credited with inventing the screw around 234 BC.…

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