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Types of Screw Points
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DIE POINT:
One of the least expensive pointing operations applied at the time
of heading. This operation provides an end chamfer starting with a
diameter smaller than the root diameter of the thread. The minimum
reduction of the point is approximately 10% below the maximum minor
diameter with an included angle of 40 to 50. |
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DOG
POINT: A straight pointed section reduced in diameter slightly
below the root diameter of the thread. Usually extending In length
about two-thirds the diameter of the thread. Recommended for ease
In starting, to insure against stripping fine threaded products, and
to increase efficiency along production lines. |
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ROLLED
POINT: An
efficient method of producing pointed long studs or long screws with
an end chamfer similar to the Die Point. The last thread and a half
is slightly cupped by the thread roll-over operation. |
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PINCH
POINT: (ROUNDED): An Inexpensive
method of applying a 40',60' or go' lead-in point having a slightly
rounded contour but with pinch-off marks on Its surface. Used for
aligning several. sheets or assembling several parts requiring pilot
action. |
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NAIL
POINT: (PINCHED): Usually supplied with an approximate
45' Included angle having a sharp point and slightly squared surface.
Used for Impinging or locking against wood or other solt material.
Other degrees of Included angle and sharpness also available. |
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CUPPED
POINT:
A special cup section supplied on the end of the threaded member having
a depression In the end to reduce the area In contact with the surface
which increases Its holding and locking power under pressure. |
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ROUND
POINT:
A dome-like rounded surface applied to the end of a threaded member
In order to offer pressure without disfigurement. Used for adjusting,
members where friction without cutting action Is desirable. |
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CONE
POINT:
A precision forming operation to provide any required Included angle.
Offers a smooth surface, accurate length, and a sharp point which
can be produced to any desired contour to fit your particular requirements. |
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TYPE
A POINT:
A thread forming screw for use in thin metal .015 to .050 thick. Used
with drilled, punched or nested holes in sheet metal, resin impregnated
plywood, asbestos combinations, among others. Not recommended for
new design. |
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TYPE
B POINT:
A thread forming screw for use In heavier metal .050 to .200 thick.
Larger root diameter with finer thread pitch for light and heavy sheet
metal non-ferrous castings, plastics, Impregnated plywood, asbestos
combinations, and other materials. |
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TYPE
AB POINT:
A thread forming screw combining locating type point of Type A with
thread size and pitch of Type B. Normal limitations of Type B apply. |
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TYPE
C POINT:
A thread forming screw with either coarse or fine pitch machine screw
thread and blunt tapered point. Eliminates chips and permits replacement
with standard screw In the field. Higher driving torque required.
Usable In heavy sheet metal and die castings. |
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TYPE
U POINT:
A thread forming screw with high Helix thread for driving or hammering
into sheet metal, castings, fiber or plastics for permanent, quick
assemblies. |
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TYPE
F POINT:
A thread cutting screw with machine screw thread with blunt tapered
point. having multi-cutting edges and chip cavities. For heavy gauge
sheet metal. aluminum, zinc and lead die castings, cast Iron, brass
and plastic. |
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TYPE
FZ POINT:
A thread cutting screw with a tapping screw thread with blunt tapered
point and multi-cutting edges and chip cavities. For plastics, die
castings, metal clad and resin impregnated plywood, and asbestos. |
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TYPE
1 POINT:
A thread cutting screw with single flute for general use. Produces
a fine standard machine screw thread for field replacement. |
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TYPE
17 POINT:
A thread cutting screw for wood with a coarse tapping screw thread
and a special long sharp point fluted to capture chips. |
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TYPE
23 POINT:
A thread cutting screw in the fine thread series offering maximum
thread cutting area and excellent chip clearing, with minimum tightening
torques. |
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TYPE
25 POINT:
A thread cutting screw similar to Type 23 point except with coarse
Type B thread. For plastics and other soft materials with large chip
clearing and cutting edges. |
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SELF-DRILLING:
With special drilling points-lengths-diameters that will drill through
'1/4" metal. Eliminates all hole preparation-drills faster than
a drill. No punching: drilling or tapping required. Reduces die costs. |
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SELF-DRILLING:
Produces more secure sheet metal assemblies faster...used as self-drilling
screw or driving thru pre-punched holes. Can be used with or without'
pilot holes. Positive rake "forward cutting edge" drills
straight thru sheet metal at peak speed. Perfectly mated threads Increase
strip and back out pressures. |
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