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SCREW MACHINE PINSPins ReceptaclesPrinted Circuit PinsPin Socket

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The basic conducting element used in printed circuit board (PCB) connections is the pin receptacle. This receptacle provides
the electrical path from the component lead through the contact to the PCB via the terminal or housing. The machined shell or
housing of pin receptacles is available in various styles depending on the application (See illustrations below). For solder mounting,
a smooth barrel is utilized since it promotes capillary action of solder between the barrel and the plated-thru-hole. Here, the
benefit of utilizing machined pins can be realized since the closed bottom design prevents flux contamination of the contact
area. If the insertion pin is unusually long or the requirement calls for board stacking, open bottom receptacles are available.
For press-fit usage, pin receptacles have been developed in various styles depending on the application. A barb
feature is available for retention in molded plastic or drilled circuit boards. Knurled shells offer additional protection against
rotation. For press-fit applications in plated-thru-holes, shells with flats on the side were developed.
The terminal end of pin receptacles have many variations; a round solder tail, press-fit tail, surface mount tail, crimp tail,
solder-cup tail, swage tail or no tail. Special pin terminations have been developed over recent years to address both
surface mount and solderless press-fit applications. For surface mounting, a “floating contact” design  was
developed. This unique, stub tail design allows .008” vertical travel in the insulator as the contact reacts to the capillary
action of the melting solder paste thus eliminating dry solder joints.  Solderless press-fit tails 
are available in a truly compliant pin for use in plated-thru-hole applications 
The inner contacts (clips) are made from precision stamped beryllium copper which is heat treated. They are designed in a
multi-tine (or “multi-finger”) style enabling them to accommodate round, square and rectangular component leads. LEYCONN
offers 35 pre-tooled contact types in 3, 4 or 6 “fingers”, that will accept diameters ranging from .008 inches to .102 inches,
encompassing most design applications. A convenient contact selector chart is located on page 203 showing the different
specifications of each contact.SCREW MACHINE PINS
Pin receptacles can be utilized as discrete connectors for the plugging and unplugging of components on pc boards. They
can be utilized individually or in random arrays where the usage is small. Here they can be handled and loaded manually
in preparation for soldering or, with different style of shell, for press-fitting. When it involves a SIP, DIP, PGA or multi-pin
custom pattern, the growing trend with printed circuit board packaging is toward utilizing socket carriers. 
The two-piece construction of pin and receptacle offers the benefit of utilizing selective precious
metal plating. For example, in many applications, gold is usually plated on the smaller contact area allowing the larger shell to
be plated in less expensive tin.SCREW MACHINE PINS
LEYCONN specialization in high-speed turning technology allows custom shells to be machined in a fraction of the time required
by processes using swaging or stamping dies and at considerably less cost. A custom interconnect can be easily realized
by selecting one of the 35 types of pre-tooled contacts (clips) and having it press-fit into a custom machined shell. The
quickest way to obtain a quotation on custom made products is to fill out the custom pin/receptacle worksheet in the back
of the LEYCONNcatalog and fax it to the factory. If you need assistance, one of LEYCONN application engineers will be pleased
to help you.  SCREW MACHINE PINS