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JACKS AND PLUGS
FAX: 773 792-2129 LONG FRAME TELEPHONE JACKS
* Please visit the product pages on our website for the most up-to-date product information
1/4" LONG FRAME TELEPHONE JACKS
81
JACK MATERIALS
The complete Switchcraft line of standard size panels,
jacks, plugs, switches and accessories are rugged, premium
quality devices...hand-crafted by experts...100% inspected...
and carefully adjusted to meet the traditionally high quality
demands of the telephone industry and the military. Tightly
controlled incoming inspection, manufacturing methods,
and QC procedures assure you of long-life, reliable components.
Typical applications where Switchcraft components have
been specified for more than five decades are: telephone
central office equipment, switchboards, jackfields, test
and patch panels, and station equipment; TV and radio
broadcasting consoles; PA and communication consoles;
SOLDER LUGS TERMINALS – Lugs project out directly
from rear of jack and are solder-coated for easy wiring and
soldering. Offset lugs can be supplied on special order (except
standard on MT-Jax ? ). Jacks with offset ground lugs are
par ticularly suitable for bussing connections on jack
panels. Contact Switchcraft for special order lug requirements.
telegraph systems and apparatus; multichannel video and
audio patching; and data processing equipment, such as
STRAIGHT
SOLDER LUGS
OFFSET
SOLDER LUGS
computers, telemetry, I/O devices and facsimile.
WIRE-WRAPPING
TERMINALS –
Wire-wrapping
FRAMES – Jack frames are heavy steel, formed and
press welded for added strength. Side member adds to
frame rigidity and resistance to shock and vibration. Both
“A” and “C” type frames can be supplied. (See next page.)
SPRINGS – A special copper alloy is used for leaf springs
because it offers excellent mechanical and electrical
characteristics, and good corrosion resistance. The spring
alloy has special hardness and ductility, and springs are
produced from custom-designed dies. Although normally
adjusted to mate with telephone (and MIL-type) plugs, springs
can be adjusted to mate with commercial phone plugs.
BUSHINGS – Bushings are copper alloy (except insulated
jacks), drilled to accept either a standard (.250" diameter
finger) plug or a popular smaller (.206" diameter finger)
plug. Series M Hi-D Jax ? have a threaded brass bushing, or a
molded thermoplastic bushing for insulated mounting.
CONTACTS – Jack design includes “wiping” action of
contacts for low resistance connections. The contacts
supplied depend on the jack selected. Gold or silver plating is
normally offered as an option on tip, ring and/or sleeve springs.
eliminates the need for soldering. Each terminal accepts up to
three wrapped wires (22 or 24 gauge, 5 wraps each), applied
with standard wire-wrapping tools. Terminal base has
standoff shoulder which prevents first wrapped wire from
accidentally sliding down and shorting against another
terminal or adjacent spring. Terminal tips are radiused to facilitate
positioning of wire-wrapping tool over terminals. See page 80 for
wire-wrapping data.
WIRE-WRAPPING
TERMINALS
PRINTED CIRCUIT TERMINALS – Components can be
supplied with printed circuit terminals on special order. Terminals
can be specified in various lengths to accommodate different
thicknesses of single and double sided boards, as well as
multilayers, and flat flexible cable and circuitry.
Several precious metals and shapes are used on jacks.
PRINTED CIRCUIT
TERMINALS
(SPECIAL)
Material
Palladium
Shape
Welded
Crossbar
Description
Best overall combination of life,
current carrying, and resistance
Fine silver
Gold alloy
Crossbar
Fine silver
(Large)
Gold or
Silver
Riveted,
button-type
Welded
switching.
Riveted,
button-type
Plating
to environment. Also known as
WEco #2.
Carries higher current than
palladium.
Recommended for dry circuit
Excellent resistance to
corrosion and contamination.
Also known as WEco #1.
Heavy currents.
For lower contact resistance
(used on through circuit springs).
OTHER TERMINALS – Many other special terminal styles are
possible. For example, where mounting permits, jacks can be
supplied with stacks having right-angle terminals. Contact
Switchcraft for special terminals.
CUSTOM COMPONENTS
Only the most popular types of jacks are listed.
DIMENSIONS ARE FOR REFERENCE ONLY
Inch
(mm)
SWITCHCRAFT, INC. 5555 N. Elston Ave. ? Chicago, IL 60630
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