Cannon Twist Pin Contact System
At the heart of our Microminiature Connector Solutions is Cannon’s proven Twist Pin Contact System, which features superior
electrical and mechanical technology that outperforms traditional machined or stamped electrical contract systems. Highly reliable
twist pin technology allows continuity in very dense areas and under severe shock and vibration, requiring low engagement and
separation forces. Termination can consist of uninsulated pigtails or insulated wire all pre-harnessed at our factory to customer
specifications. Cannon engineers developed and introduced Twist Pin Contact Technology in the 1960s, and have used it in the
Cannon MDM Series Microminiature Connectors for decades. ITT Cannon Cannon’s Twist Pin System consists of the Micro Socket
and the Micro Pin or Twist Pin.
Advantages of Cannon’s Twist Pin Contact System
• Seven points of electrical contact (Micro 0.050 inch interconnect)
• Contact and crimp sleeve materials carefully optimized for
extremely reliable crimps; no design tradeoffs
• Seamless crimp sleeves
• Multiple 4-indent wire crimps standard & smaller bore micro
socket contacts
• Standard integral tail & thru bundle MicroPin contacts
(high density packaging)
• High mating cycles
• High current handling capabilities
• System qualification in numerous aerospace, defense, electronic
& high temperature geophysical applications
• Wide array of wire terminations
How It Works: POS-A-Line Contact Alignment*
The flexible Twist Pin is recessed into the insulator and the rigid socket is exposed, reversing the traditional positions of pin and socket.
During mating, the socket is guided into the pin insulator by the lead-in chamfer. The pin is kept from flexing beyond the socket
capture radius by the walls of the cavity. The hemispherical weld of controlled radius at the tip of the pin combines with the lead-in
chamfers of the socket contact and the pin insulator to carn the pin into alignment. By controlling the welding process and the
dimensions of the socket contact and the insulators, it is impossible for the recessed pin to escape the socket capture radius.
Cannon
MICROPIN
NORMAL MATING
CONDITIONS
WIRE
WELDED TIP
WIRE CRIMP
SEVERE MISALIGNMENT
SLEEVE
CRIMP
AREA
Figure 1
TWIST PIN CONTACTS WILL MATE
EVEN UNDER SEVERE MISALIGNMENT
*Figure 1 - The Twist Pin Contact System consists of several stranded cores making up the wire bundle. The strands are subsequently
heat treated and a weld is performed on the tip of each contact. Crimp sleeves are then inserted over the contact and crimp areas
are defined to produce a seamless crimp system. The Twist Pin Contact System is referred by ITT Cannon as a Pos-A-Line contact
alignment system. Our reference to this system identifies that the flexible Twist Pin is recessed into the insulator and the rigid socket
is exposed thus reversing the traditional positions of the pin and socket. During the mating sequence, the socket is guided into the
pin insulator by the lead-in chamfer. The pin is kept from flexing beyond the socket capture radius by the walls of the cavity. The
hemispherical weld of controlled radius at the tip of the pin combines with the lead-in chamfer of the socket contact and the pin
insulator to cam the pin in alignment. ITT Cannon has developed a very robust Six Sigma manufacturing process that controls the
welding process as well as the dimensions of the socket contact and insulator material. The net result is a contact system that makes
it impossible for the recessed pin to escape the socket capture radius.
Figure 2
Figure 2 - Illustrates the Twist Pin features, as well
as mating & severe misalignment conditions.
www.ittcannon.com
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