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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. |
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FLAT
HEAD: Supplied
to standard dimensions with an 80' to 82' 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 counter bored dies to Insure concentricity, they may be used successfully
in counter bored 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 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 problem. |
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PHILIPS
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 originality 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 is recommended. |
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FLAT
AND OVAL HEADS (UNDERCUTI: This Is the standard flat or
oval head SO' to 82' countersunk screw which has the lower one-third
of the countersunk portion removed 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 (100'
COUNTERSUNK): This special flat head screw has been developed 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 permanent fastener. A great many varieties in all
screw diameters are available in productive quantities. |
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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. |
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