Self-tapping screws on the consolidation of the material can, on its
own thread, body will be consolidation "attack - drill, squeeze,
press" give the corresponding thread, closely cooperate with each
other. Self tapping screw is a kind of screw, with a bit through a
dedicated electric tool construction, drilling, tapping, fixed, lock
one time. Self tapping screw is mainly used in some relatively thin
plate connected with the fixed, color such as color steel plate and
steel connections, choi steel even with the beam purlin, wall, etc.,
its penetration is generally not more than 6 mm, maximum of no more
than 12 mm. Tapping screws are often exposed to outdoor, itself has a
strong corrosion resistant ability; The rubber sealing ring can
guarantee the screw place don't ooze water and has good corrosion
resistance. Tapping screw usually use screw series, quantity per inch
thread length and diameter screw length three Numbers to describe the
refs. Screw diameter series has two levels 10 and 12, the
corresponding screw diameter of 4.87 mm and 5.43 mm respectively;
Length per inch thread number 14, 16, 24 three levels, the more length
per inch thread, the drilling ability is stronger.
