Terminal pin

Terminal Pins
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We use statistical process control together with continuous
inspection to ensure that our products meet or surpass our
customer’s specifications. Each individual terminal pin order is
manufactured using our specially designed Instant Heat
process control chart. Graphs on these charts allow us to
control and document critical dimensions for our customers
during the actual manufacturing process.
We supply our terminal pins from 2 types of wire. The first
type is un-plated, low-carbon (C-1008) mild steel. The second
type is a pre-platedmaterial that has an inner core of the same
low-carbon steel but then has a 2% by weight coating of
nickel. Both wires have tensile strengths from
60,000 to 75,000 PSI.
We use specially designed cold-forming machines to produce
our pins. These machines hold much closer tolerances than
screw machines that are commonly used to make these pins.
The cold-forming process allows us to use a softer wire with a
lower tensile strength that makes welding the pin to coil
assemblies much easier.
Oftentimes it is necessary to anneal screw-machined terminal
pins before they can be used in the heating elements. This
creates problems for the element manufacturer because the
pins often bend, and they can also discolor or oxidize in the
welding area during annealing. Our cold-forming process and
the softer wire we use eliminate all of these potential problems
for our customers.
The pre-plated nickel wire we use has many advantages for
element manufacturers. First, the nickel coating is applied
when the wire is still in rod form. The wire is then drawn down
to the final size and the nickel coating becomes embedded in
the steel material. Then, because we are cold-forming the parts,
the nickel coating is not removed, but rather it is further
embedded. The end result is that the nickel coating on our pins
is impervious to peeling or flaking off and will withstand
temperatures to 1200° C (2200° F) without melting away or
discoloring. The nickel also greatly enhances the welding of
the pins to the coils.
Our Terminal Pins Division produces terminal pins that are used in tubular heating elements. We specialize in
producing these terminal pins in high volumes with close tolerances. We currently supply a large majority of the
heating element manufacturers in the United States, Canada, and Mexico, and we also export throughout the world.
Our commitment to zero rejects and 100% on-time delivery has enabled us to forge solid partnerships with our many
terminal pin customers.
Terminal Pins
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Below are the 5 wire diameters that we currently use to manufacture our terminal pins. We make these pins in lengths
from 50mm to 230mm (2” to 9”).
While these are the standard wire diameters for which we are tooled and for which we currently stock wire, if your
volume is sufficient, we may be willing to make additional wire diameter terminal pins.
Below are shown the 5 typical styles of terminal pins that we commonly manufacture.
.062” 1.57mm
.075” 1.90mm
.091” 2.31mm
.105” 2.67mm
.125” 3.18mm
.109” 2.77mm
.114” 2.90mm
.141” 3.58mm
Standard Upper Pin Standard Lower Pin
Special Upper Pin Combination Pin
This special upper pin with a tapered head Allows
for easier insertion of the upper either an upper or
sealing plug on the pins.
The combination pin can be used for either an upper
or a lower terminal pin. This design is not available
in 2.67 and 3.18mm (.105” and .125”) pins.
Universal Pin
The universal pin can be used for either An upper or
lower terminal pin and also has a tapered head to
allow for the easier insertion of the sealing plug. This
style pin is only available in 1.57 and 1.9mm (.062
and .075”) diameter pins.
The use of the special Combination or Universal style pins significantly
reduces the number of different pins a customer must stock.
Terminal Pins
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