• Screw Thread Standards

    Posted August 22, 2019 - Updated Dec 3, 2019

    Setting Screw Thread Standards In the mid-1800’s, Sir Joseph Whitworth developed the first screw thread standards for a fastening thread which now bears his name. This standard detailed the diameter and pitch combinations along with limits of size for each combination. Later, Britain, Canada and the United States developed the Unified Screw Thread standard which […]

  • Screw Basics

    Posted August 22, 2019 - Updated Dec 3, 2019

    Screw Basics–The Invention of the First Screw The first practical application of the humble screw thread was developed by Archimedes in the 3rd century B.C. He used a pipe wrapped around a shaft in a helical pattern to make a crude bilge pump for ships Figure 15 & Figure 16. Later Archimedes wrote a mathematical […]