1969 Rear Vent Screw Type
I recently had a minor deduct for the undercut phillips oval head rear vent screws on my '69. I ordered new screws from Paragon but they look the same that I have on there. What head style is correct for these screws?
TYPES OF BOLT AND SCREW HEADS
PAN HEAD: Recommended for new designs to replace round, truss and binding heads. Provides a low large diameter head, but with characteristically high outer edge along the outer periphery of the head where drive action is most effective for high tightening torques. Slightly different head contour where supplied with recessed head. See dotted line.
ROUND HEAD: Not recommended for new design (see pan head). This head was the most universally used design in the past.
FILLISTER HEAD: The standard oval fillister head has a smaller diameter than the round head, but is higher with a correspondingly deeper slot. The small diameter head increases the pressure applied on the smaller area and can be assembled close to flanges and raised surfaces
BINDING HEAD (Straight Side): Most generally used in electrical and radio work because of its identifying undercut beneath the head, which binds and eliminates fraying of stranded wire. A medium - low head with ordinarily sufficient bearing surface. Not recommended as a Phillips Recessed head --see Pan Head for better functional design.
TRUSS HEAD: Also known as oven head, stove head, and oval binding head. A low, large diameter head that can be used to cover larger diameter clearance holes in sheet metal when additional play in assembly tolerance is required.
FLAT AND OVAL HEADS (UNDERCUT):
TYPES OF BOLT AND SCREW HEADS
PAN HEAD: Recommended for new designs to replace round, truss and binding heads. Provides a low large diameter head, but with characteristically high outer edge along the outer periphery of the head where drive action is most effective for high tightening torques. Slightly different head contour where supplied with recessed head. See dotted line. ROUND HEAD: Not recommended for new design (see pan head). This head was the most universally used design in the past. FILLISTER HEAD: The standard oval fillister head has a smaller diameter than the round head, but is higher with a correspondingly deeper slot. The small diameter head increases the pressure applied on the smaller area and can be assembled close to flanges and raised surfaces BINDING HEAD (Straight Side): Most generally used in electrical and radio work because of its identifying undercut beneath the head, which binds and eliminates fraying of stranded wire. A medium - low head with ordinarily sufficient bearing surface. Not recommended as a Phillips Recessed head --see Pan Head for better functional design. TRUSS HEAD: Also known as oven head, stove head, and oval binding head. A low, large diameter head that can be used to cover larger diameter clearance holes in sheet metal when additional play in assembly tolerance is required.FLAT AND OVAL HEADS (UNDERCUT):
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