connections are used for frequent assembly and disassembly of components.
tapping screws are directly fixed on the plastic parts to be assembled.
A snap fit is an
effective method to design the fastening system into the product design
itself. A snap-fit allows parts to be either permanently fastened (or
pre-determined to be broken off) or to have frequent assembly and disassembly.
Threaded metal inserts
threaded insert is a way to create a connection that can be assembled and
disassembled repeatedly without problems. A metal part is inserted in the
product and the connection made using a standard screw or bolt.
Hook and loop type fasteners
Hook-and-loop fasteners are used for connecting parts together which need to
be frequently removed. They are available in a variety of shapes, sizes and
colors. They are very durable.
Molded-in threads are used where assemblies are seldom disassembled. Internal
as well as external threads are common.
Boss caps are cup-shaped
rings stamped from metal sheet which are pressed onto the top of hollow
plastic bosses by hand or tools. A boss cap is used to reinforce a mechanical
Push-on / Turn-on fasteners
Push-on and turn-on fasteners are self locking, self threading fasteners that
replace standard nuts. These fasteners are pushed-on or screwed-on to studs
molded into a part for capturing the mating component. They are easy to use,
inexpensive and vibration resistant. These fasteners are effective to provide
a light to medium duty assembly.
Rivets provide a simple
and an economical method to produce strong and permanent mechanical joints.
They are generally used to assemble thin sections.
Press-fits are a
simple and cost effective means to connect two parts. A press-fit is usually
applied to connect a hub to a solid or hollow shaft. Mechanical forces between
the two parts supply the required pre-stress to enable the connection to
transmit an axial force or a torque.