Fasteners Types and Terms
Types of Fasteners
- are screws and bolts used in the assembly of aircraft.
- are fasteners that are installed by pulling
the end of the mandrel or stem, resulting in the breakage of the stem
at the breaker groove and leaving the head of the stem within the fastener
body.
- have received heat treatments resulting in
a fastener surface that is harder than the core.
- follow the metric system instead of the English
system. Conversion charts are available from most fastener manufacturers.
- comply with U.S. federal and military specifications
for fastening mechanisms.
- work together to form a common fastening mechanism.
A bolt is an external threaded fastener that consists of a partially
threaded shaft, which penetrates the object connected, and is held
in place by nuts, metal blocks with complementary internal threads
that grasp the upper shaft of the bolt and secure the work piece together.
- function as latching mechanisms on doors and compartments
and join panels on cabinets, workstations and appliances.
- provide an alternative to
traditional metal fasteners, although they have low resistance to
UV radiation. Plastic fasteners
are common components of children's toys, as well as appliances
and automobiles.
- are non-threaded fasteners commonly used on door
hinges and pulleys, as well as furniture and electronic equipment.
Pins are
placed into aligned holes in the joined parts, forming a secure connection.
- are external threaded fasteners consisting of a spiral-shaped
shaft and a head. The shaft fits into a work piece and is held
in place by the head.
- are available through many fastener manufacturers.
Specialty fasteners can be custom-made according to specific
customer requirements.
- are strong, corrosion and heat resistant
mechanisms that are useful in countless applications in the
automotive, electronic, medical, marine and construction industries.
- have received heat
treatments, resulting in consistent hardness throughout the entire
fastener.
Fastener Terms
- The supporting part of the
fastener through which the fastener is loaded.
- A fastener accessible on only one side.
- The point on a blind fastener that can not be accessed.
- Referring to blind fasteners, it is the part of the rivet
that expands into the material. In reference to threaded fasteners, it
is the part of the fastener that is not threaded and is located under
the head.
- A head of a threaded fastener that has a low, rounded
top surface and a bearing surface, which is large and flat.
- The ability of a fastener to hold together previously
separated materials.
- A feature of fasteners that allows them to
fill irregular, slotted, oversized or misaligned holes.
- The condition in which two fastener surfaces share
the same center.
- A head that when installed will sit flush to
the surface.
- The permanent deformation of a fastener resulting from
the application of stress and heat.
- The degree of difference between the centers of
the surface of a fastener at different points.
- A fracture resistance ability of a fastener
during subjection to stress variations.
- A head with a rounded top, cylindrical-shaped
sides and a bearing surface that is flat.
- The thickness of the assembled materials or parts for which
the fastener was designed to secure.
- The materials that the fastener connects together.
- A measurement indicating the length between the beginning
of a thread and the point at which the thread reaches its fullest size.
- The widest point of a screw thread.
- The narrowest point of a screw thread.
- The distance between two threads.
- The part of the fastener body between the head and the
threaded portion.
- Components designed to protect fragile materials at contact
points between the material and the fastener.
- The process of creating threads by cutting into
the metal blank, as opposed to rolling.
- A cold forming process involving the creation
of threads through the plastic deformation of a metal blank. The process,
which produces rolled threads that have higher strength and abrasion
resistance than threads constructed through cutting, involves the application
of pressure, which stretches the metal past its elastic limit into the
required profile