| Thread
Cutting Screw
The off-center
shank slot on these case-hardened screws provided the first
type of thread-forming fastener. The various slot designs
provide true cutting action, cleanly removing the mating
metal as it is installed - eliminating a separate tapping
operation and generating a perfectly mated thread that contributes
to a stronger fastening.
Over the years, several types of thread cutters have been
designed for specific applications and materials.
- Type
1 thread cutting screws are recommended for steel parts
having a thickness less than half of the screw diameter.
- The
Type 23 thread cutting screw, with its wider shank slot.
is recommended for use in cast iron and soft metals such
as zinc and aluminum castings -and in some plastics.
- The
Type 25 thread cutting screw, combining a wide thread
cutting shank slot and acute cutting edge with spaced
threads for low driving/high stripping torque is ideal
for cutting mating threads in thermoset plastic materials.
- The
Type 17 screw will drill its own hole and cut close mating
threads in wood. light plastics and particle board.
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