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  • Source Four Barrel Screws Changes Through Time


    Pertains to the 19°,26°,36° and 50° Lens Tubes:

    In 1996, ETC was using for the S4 Lens Tube:  

    4x HW391 --- Screw, 8-32 x 3/4 phPHMS B/Z

    8x 7060A4012 --- Lens Pad Support

    6x 7060A4009 --- Bushing Guides

    Around 1997, ETC started using for the S4 Lens Tube:

    4x HW369 --- Screw, 8-32 x 5/8 PhPHMS BO

    10x 7060A4012 --- Lens Pad Support

    8x 7060A4009 --- Bushing Guides

    Around 2006, ETC started using for the S4 Lens Tube:

    4x HW3154 --- Screw, 8-32 x 5/8 PhPHMS BO Taptit B/Z Waxed

    10x 7060A4012 --- Lens Pad Support

    8x 7060A4009 --- Bushing Guides

    The HW369 is a machine screw and required a nut for assembly.

    The HW3154 is a thread forming screw that threads into the casting so no nut is needed. If the S4 had the HW369 screw + nut, then those need to be used for replacing, because the screw hole in the tube would be too large for the current HW3154 screw.