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SKETCH |
TITLE |
COMMENTS |
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CHAMFER CUT POINT
(Boltmaker Point) |
The normal point found on
most good quality hexagon bolts/set screws and cap screws. The
chamfer is applied in a pointing station on a boltmaker prior to
ejection through the thread rolling plates. |
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ROLLED POINT |
A point that is found mostly
on machine screws and cup head bolts, where the cold header
product is simply roll threaded with no special attention to the
end of the blank shank. |
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RADIUS POINT
(Oval Point)
(Round Point) |
A radius point is kind to
the surface of a mating part on which it bears.
It may be found on a special screw which is being retightened
regularly. |
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CUP POINT |
Another point designed to
bear on a mating part.
Normally in a low tension assembly where the point contact
assists retention.
Sometimes has knurls on the tip circumference, known as knurled
cup point. |
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CONE POINT |
Designed to positively
locate a mating part by engaging in a drilled or prepared
indentation. Only found on specials. |
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DOG POINT |
As with cone points, this
point locates a mating part. A dog point would tend to be more
accurate and withstand greater load. Again, specials only. |
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DRILL POINT |
A point very similar to a
standard drill and designed to drill then tap or form a thread
whilst driving. Some are milled points, some pinch pointed in
special cold headers.
There a re a number of proprietary versions - Drill Kwik®, Teks®,
Pias®, etc. |
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TYPE 17 |
Designed to pierce and self
drill sheet metal and drill timber supports, cutting threads
whilst driving.
The slot is applied by a milling shank slotter after thread
rolling. |
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NEEDLE POINT |
A very sharp point made with
special heading dies.
Used to pierce light gauge sheet metals for self tapper type
applications without having to drill.
Very often used in construction of steel framed housing to
secure plasterboard. |
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TYPE AB POINT
(Gimlet Point) |
When on a self-tapper, it is
called 'AB', on a woodscrew or coach screw is called 'gimlet'. A
die produced point in the primary cold header, thread rolled
leaving a thread start on the taper. This helps pull the screw
into the hole and start the tapping groove. |
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TYPE B POINT
(Formerly Z) |
Generally only found on
self-tapping screws where either it is going into a blind hole
where it will locate square more easily and give longer thread
engagement, or where the point may protrude into an area where
it could snag something or someone |
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TAPTITE®
(Type TT) |
Tri-lobular point and body.
Thread forming - refer to machine screw thread forms.
Note other thread forming screws could include square-flow, and
Type F, each with similar point treatment. |
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TYPE 23 |
Milled slot point, machine
thread screw, thread cutting - refer to machine screw thread
forms. |
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TYPE 25 |
Milled slot point, spaced
thread screw, thread cutting - refer to spaced thread forms.
Note: other spaced thread thread forming screws could include
Type BF and Type Y. |
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TYPE U
(Hammer Drive) |
Very similar to a dog point
to give a positive location in the prepared hole. |
