Did You Know?

  • Although a point of discussion, it is believed that the source of the term SEMS for a bolt with a captive loose washer originated in the 1930’s when E. C. Crowther patented his idea for installing a washer over a screw before thread rolling. These pre-asSEMbled washers were sold in batches, hence the plural SEMS. It is a generic term without a current trademark being held by any producer.source: Bolt Science
  • A study of bolted joint failures during Skylab missions yielded the following assignment of root causes:
    Improper Assembly

    Parts Damaged in Handling

    Inadequate Design

    Incorrect Torque

    Faulty Parts






    source: Southwest Research Institute

  • For each $100 of direct part cost there is approximately $19 in additional cost generated for the design, procurement, and maintenance of the part. The initial cost of introducing a new part (design and release) is approximately $2,600 to $10,800, depending on part complexity.source: IBM
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