Knowledge about the various types of screw heads, method & requirement - PowerPoint PPT Presentation

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Knowledge about the various types of screw heads, method & requirement

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Here in this article, we have shared most screw heads come in a variety of styles, including a Phillips fillister head or a slotted flat top as well as in many sizes. And, brass machine screw is a machine hookworm that can have a different type of head. – PowerPoint PPT presentation

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Title: Knowledge about the various types of screw heads, method & requirement


1
Types of Screws and Where These are Used
2
  • All screws and not the same and knowing which
    screw to use is important to ensure that its
    doing its job right. For instance, the screw that
    holds your furniture together will not work if
    you decided to hammer it into your wall to hang
    your pictures. The right screw for the right job
    makes all the difference whether it is for
    carpentry or for building a ship.
  • There are many kind of screws and there are many
    ways of classifying them. One of these is to
    classify them according to the job requirement.
    For instance, brass machine screws, that are used
    for motor casing. You can also classify screws
    according to the driving method and head shapes.
    Here are the classifications in detail

3
By Driving Method
  • This classification is based on the shape of the
    slot at the screw head. This will also determine
    the shape of the screwdriver or drill head. These
    are
  •  
  • Slotted This is the oldest and most common
    shape. The slot at the head is just a linear
    diameter and can be used with a standard
    screwdriver.  
  • Philips The head has a cross-shaped slot that
    does not reach the edges. It requires a
    Philips-head screwdriver. This shape offers a
    more compact grip to the screwdriver head.
  • Combination This is a combination of the slotted
    and Philips. It has a cross-shaped slot like a
    Philips head with one of the linear slots running
    to the edges like a slotted head.
  • Allen/Hex It has a hexagonal slot that is
    tightened with an Allen wrench. This type of
    screw can only be loosened by a socket wrench.
  • Square It has a square-shaped slot.
  • Star The star-shaped indentation is extremely
    efficient in preventing stripped heads.

4
By Head Shapes
  • This classification is according to the shape of
    the screw head. Some of these may not even have a
    slot at the top. These head cannot be fastened by
    a screwdriver and need a wrench.
  • The different shapes we find in screws are Flat,
    Oval, Socket cap, Pan, Round, Button, Hex,
    Flange, Truss, Full bearing, Washer-faced,
    slotted-hexagon, Flat hexagon socket, Countersunk
    hexagon slotted, Countersunk, Raised countersunk,
    Philps round pan, Philips round and so on.

5
By Job Requirement
  • The shape of the screw head does not matter here.
    The material and the shank shape are more
    important, like brass machine screws. Both these
    factors determine where the screw can be used.
    The different type of screws here are
  • Wood screw These are screws used with woodwork.
    The screws are unthreaded at top with coarse
    threads at the bottom for better grip on
    penetration. This ensures that the screw will go
    in smoothly without excessive splintering. There
    are various sizes and types here. These can be
    wood or metal like brass, bronze and steel. Since
    these are used in making furniture, the type
    should also be picked for aesthetic purposes,
    such as round-headed screws.
  • Machine screw Made from machining, these screws
    have the advantage of customization. A typical
    screw will have very clean threading and a much
    better grip. Machine screws like brass machine
    screws are used in pre-drilled holes. These are
    used in motor casings, electrical terminals etc.
    However, these cannot be used with wood.

6
  • Sheet metal screw These screws have full thread,
    but a wide variety in head type. The screws have
    the advantage of customization and are used in a
    wide array of applications, such as with
    plastics, rubber, plywood and metal. However,
    these cannot replace the wood screw. There are
    many types of screws that come under this
    category and the right screw depends on the
    material you will be using.
  • Drywell screws There are two types of drywall
    screws finely threaded (S-type) and coarsely
    threaded (W-type). Finely threaded screws are
    used to attach metal studs, while coarsely
    threaded screws are used to attach wood to
    drywall. Both types have sharp points that makes
    drilling fast and easy. In addition, the finely
    threaded do not need any pre-drilling because of
    their pointed ends.

7
  • These are the different types of screws that you
    have to look for. When buying a screw, you will
    notice that it will fall into different
    categories.
  • For instance, a brass machine screw is a machine
    screw which can have different types of head.

8
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