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  1. dmsang

    FR4 PCB CTE vs. Steel screw/nut joint CTE

    New to the forum . . . I am wondering how a .093 thk FR4 board Z direction CTE would compare to a steel screw CTE. The issue is that there is a heatsink bolted to a .093 FR4 board using a steel shoulder screw and nut. Any ideas what the CTE mismatch between the bolted joint and FR4 Z...
  2. dmsang

    FR4 CTE vs Steel screw/nut CTE

    New to the forum . . . I am wondering how a .093 thk FR4 board Z direction CTE would compare to a steel screw CTE. The issue is that there is a heatsink bolted to a .093 FR4 board using a steel shoulder screw and nut. Any ideas what the CTE mismatch between the bolted joint and FR4 Z...

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