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Dbroberts fastener guide D B Roberts Company DISTRIBUTING VALUE ?? ONE SOLUTION AT A TIME FASTENER - - - www dbroberts com REFERENCE GUIDE TYPES OF BOLT AND SCREW HEADS POZIDRIV PAN HEAD Recommended for new designs to replace round truss and binding heads

D B Roberts Company DISTRIBUTING VALUE ?? ONE SOLUTION AT A TIME FASTENER - - - www dbroberts com REFERENCE GUIDE TYPES OF BOLT AND SCREW HEADS POZIDRIV 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 driving action is most e ?ective for high tightening torques Slightly di ?erent head contour where supplied with recessed head See dotted line FLAT HEAD Supplied fo standard dimensions wih an to angle to be used where ?nished surfaces require a ush fastening unit The countersunk portion o ?ers good centering possibilities ROUND HEAD Not recommended for new design see pan head This head was the most universally used design in he past OVAL HEAD Fully speci ?ed as ??oval countersunk ? this head is identical to the standard at head but possesses in addition a rounded neat appearing upper surface for attractiveness of design FILLISTER HEAD The standard oval ?llister head has a smaller diameter than the round head but is higher with a correspondingly deeper slot The smaller diameter head increases the pressure applied on the smaller area and can be assembled close to anges and raised surfaces Headed in counterbored dies to insure concentricity they may be used successfully in counterbored holes 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 O ?ers an attractively designed medium-low head with ordinarily su ?cient bearing surface Not ordinarily 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 neat appearing large diameter head having excellent design qualities and as illustrated can be used to cover larger diameter clearance holes in sheet metal when additional play in assembly tolerance is required Suggest pan head as a substitute HOLT HEAD PATENTED Provides the perfect tamper-proof assembly Theft-proof ??decorative yet inexpensive Special drivers available for ?eld removal or power driven assembly machines ONE-WAY HEAD This ingenious tamper- proof type of head once assembled cannot be removed yet is driven with a standard screw driver Manufactured with amazing economy in productive quantities this simple design can frequently solve costly assembly problems PHILLIPS FINISHING WASHER HEAD Designed as a neat appearance product for the electronic and appliance trade with all threaded styles WASHER HEAD This design has the ?nished appearance of a conventional round head plus washer and was originally created to provide extra large bearing surface under the head The modern ??truss ? head carried in stock normally answers this purpose When a larger diameter is required this washer head design is recommended FLAT AND OVAL HEADS UNDERCUT This is the standard at or oval head to countersunk screw which has the lower one-third of the countersunk portion removed to facilitate production of extremely short