The thread profile of UNC is
the same as for metric threads
and is described in the JIS
B0206 standard. The thread is
described by its major
diameter and the number of
threads per inch of length
(TPI). This thread series is
commonly used in the mass
production of bolts, screws
and nuts. It is used for
threading into lower tensile
strength materials (bronze,
brass, aluminum and plastics)
to obtain the best resistance
to stripping of the internal
thread. It is also used on
quick assembly or disassembly
or if corrosion or slight
damage is possible.
Features:
Unified National Coarse.
UNC is described by its major
diameter and the number of
threads per inch of length
(TPI).
Manufactured from high speed
steel material to
International DIN standards
(DIN352/351).
Available in Taper, Bottoming
and Intermediate styles in all
sizes.
Suitable for materials up to
1000N/mm2.
Suitable for both hand &
machine operation.
Bright finished with straight
flute.
Bottoming Taps have a lead of
two threads and are used to
ensure minimum thread run-out
when tapping to the bottom of
a blind hole.
Bottoming Taps are typically
preceded by the use of a Taper
or Intermediate Tap
Specifications:
Size - 1/4"
Lead - Bottoming
Material - High Speed Steel
(HSS)
Type - Straight Flute