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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 effective for high tightening torques. |
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ROUND HEAD: Not recommended for new design (see pan head). This head was the most universally used design in the past. |
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FLAT HEAD: Supplied to standard dimensions with an 80º to 82º angle to be used where finished surfaces require a flush fastening unit. The countersunk portion offers good centering possibilities. |
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OVAL HEAD: Fully specified as "oval countersunk", this head is identical to the standard flat head. but possesses. in addition, a rounded, neat appearing upper surface for attractiveness of design. |
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UNDERCUT HEADS (FLAT AND OVAL): This is the standard flat or oval head 80º to 82º countersunk screw which has the lower one-third of the countersunk portion re moved to facilitate production of extremely short lengths. As illustrated, it will fit a standard counter bored hole and is particularly adaptable to flush assemblies in thin stock. |
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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. |
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SQUARE SHOULDER SCREWS: An adaptation of the standard carriage bolt design. Possesses a truss head on a square shank which resists rotation when located or driven into place. This square shoulder may also be staked into place as a permanent fastener. A great many varieties in all screw diameters are available in productive quantities. |
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FILLISTER HEAD: The-standard oval fillister 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 flanges and raised surfaces. Headed in counter bored dies to insure concentricity, they may be used successfully in counter bored holes. |
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BINDER 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. Offers an attractively designed, medium-low head with ordinarily sufficient bearing surface. Not ordinarily recommended as a Phillips Recessed head-see Pan Head for better functional design. |
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PHILLIPS WAFER HEAD: Designed as a neat appearance product for the electronic and appliance trade with all threaded styles. |
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WASHER HEAD: This design has the finished 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. |
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INDENTED HEXAGON: An inexpensive wrench head fastener made to standard hexagon head dimensions. The hex is completely cold upset in a counter bored die and possesses an identifying depression in the top surface of the head. |
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INDENTED HEXAGON WASHER HEAD: Produced in the same manner as the standard indented hexagon head but with a washer section at the base of the head to protect the finish of the assembly from wrench disfigurement. |
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Type "U" Weld for general application. Assembles easily into pre-located holes and fully utilizes head strength. Top surfaces of head designed for efficient welding anode contact. |
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Type "T" Weld for applications requiring smooth, finished outer surfaces. Under surface of head is designed for perfect electrode contact. |
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ONE-WAY HEAD: This ingenious, tamper-proof type of head, once assembled can not 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. |
