How to Choose a Drill Screws for Metal
To lock an object on a metal surface,
fasten the construction of a metal or a metal profile attached to the tree or
other material, used for metal screws. The hardware is convenient, but
they cannot always drive them to the surface without pre-perforation.
Screw is one of the most popular hardware,
often used for repairs and in various designs. It is advantageous in that it
can reduce the costs in time and labor. Screws are made of high carbon steel
with oxidized finish. Available in various lengths, diameters, and can
have a different thread pitch. Depending on the application of the screws
are different types of metal. For easy screwing them usually fastened
parts previously drilled holes. But these holes need to be drilled based
on metal thickness and the type of hardware. For example, self-tapping
screws with a press washer and with a drill on the end bind metal structures sheets
up to 2 mm can be mounted without drilling holes.
Black screws on the metal plate attached to
the wooden bases without drilling, and when the sheet thickness of 2 mm, it is
already necessary to drill a hole. Drill holes in two workpieces, which are
pre-set to the desired position. Drill holes for the device must be used
for tapping versatile metal. BTW, you can select the triangle
drill bit and drill
hog drill bits at Banggood with high quality and reasonable prices.
The upper part drill is a larger diameter than
the screw, so that was a pressing effect. The lower surface is drilled
with a diameter equal to the diameter of the screw thread minus two heights
(distance from the top of the thread to the base of the profile, measured
perpendicular to the screw axis). The diameter of the screw is determined
by the marking in a store or a caliper is measured independently.
With increasing thickness of the metal is
increased and the diameter of the drill. For example, for a screw press
washer and the sharp tip and the drill tip in the form of an increase in sheet
thickness of 0.5 mm and a lead for increasing drill diameter of 0.1 mm. For
black screws with sharp tip by increasing metal thickness by 0.5 mm diameter
drill should be increased by 0.2 mm. Hole’s depth should be slightly
longer than the length of the screw. Once the hole is ready, it must be cleaned
and lubricated. Screw can be screwed with the appropriate screwdriver or
screwdriver head.