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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. Slightly different head contour where supplied with recessed head. See dotted line. |
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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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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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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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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 counterbored dies to insure concentricity, they may be used successfully in counterbored holes. |
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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. 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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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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HOLT HEAD (PATENTED): Provides the perfect tamper-proof assembly. Theft-proof -- decorative, yet inexpensive. Special drivers
available for field removal or power
driven assembly machines. |
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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. |
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PHILLIPS FINISHING WASHER 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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FLAT AND OVAL HEADS (UNDERCUT): 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 counterbored hole and is particularly adaptable to flush assemblies in thin
stock. |
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FLAT HEAD (100º COUNTERSUNK): This special flat head screw has been devel
oped for applications requiring flush surfaces, and
is recommended for use in soft
materials, to distribute pressure over a larger and less angular surface. Very well
adapted for use
with thin aluminum, soft plastics, etc. |
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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 perma
nent fastener. A
great many varieties in all screw diameters are available in produc
tive quantities. |
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INDENTED HEXAGON: An inexpensive wrench head fastener made to standard hex
agon head dimensions. The hex is completely
cold upset in a counterbored 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 stand
ard indented hexagon head but with a washer
section at the base of the head to pro
tect the finish of the assembly from wrench disfigurement. |
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ACORN HEAD (FULL UNDERCUT): A very neat appearing trim screw for appliance
application -- excellent wrench surfaces. |
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HEXAGON HEAD (TRIMMED): This is the standard type of wrench-applied hexagon head, characterized by clean, sharp corners
trimmed to close tolerances. Recommended for general applications, it is available in all standard patterns and in all thread
diameters. |
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HEAD STYLES (WELDING SCREWS): The welding screw nas beenoeveloped to provide a strong. permanent threaded fastener which
becomes an integral part of the assembly. It utilizes the principle of projection welding by means of multiple lugs applied to
various head surfaces. |
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Type "U" (Underlug) for general application. Assembles easily into prelocated holes and fully utilizes head strength. Top surfaces of
head designed for efficient welding anode contact. |
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Flat Head styles take full advantage of the self-centering feature of the countersunk portion and provide a smooth, flush outer surface. |
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Type "T" (Overlug) for applications requiring smooth, finished outer surfaces. Under surface of head is designed for perfect
electrode contact. |
