STP587

    Modified ISO Metric Screw Threads

    Published: Jan 1975


      Format Pages Price  
    PDF (676K) 25 $25   ADD TO CART
    Complete Source PDF (3.9M) 25 $55   ADD TO CART


    Abstract

    Screw threads for mechanical fasteners have been studied extensively over the years by researchers in many nations. Present commercial standards for metric threads have not incorporated any of the potential improvements. The American National Standards Institute Special Committee to Study Development of an Optimum Metric Fastener System studied and evaluated many means of improving screw threads. It has developed a modified ISO thread profile which improved fatigue resistance but which functionally assembled with existing ISO threads. The thread is defined by boundary profiles for gages to minimize confusion in defining acceptability conditions. A new gaging system based on assembleability and control of ridge width for thread strength has been developed.


    Author Information:

    Baumgartner, TC
    Standard Pressed Steel Co,


    Paper ID: STP36550S

    Committee/Subcommittee: F16.93

    DOI: 10.1520/STP36550S


    CrossRef ASTM International is a member of CrossRef.