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  • white paper: Shoulder Screws
    Head height tolerances are normally ± .005” for inch screws and ± 0,127mm for metric screws. … available in which the head height is just thick enough to accommodate a flat screw driver slot … … screw, a Phillips drive or hex socket drive will closely approach the head undercut and create a …
  • CR4 - Thread: Flat Head Bolts
    You may want to look into " undercut flathead" screws , though I've only seen them up to 1/2" diameter, and don't know what grades are available. See http://www.winkfast.com/Phil- flat -undercut-ms.html for a quick reference to what I'm talking … It may be worth investigating use of metric fasteners, though the standard 90 degree heads are not going to help (vs. 82 deg.).