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LONG FRAME TELEPHONE JACKS
82
JACKS AND PLUGS
PHONE: 773 792-2700
* Please visit the product pages on our website for the most up-to-date product information
LONG FRAME TELEPHONE JACKS
MT-Jax ?
(“A” Frame)
MT-Jax ? jacks Numbers ? MT-342B and ? MT-344B have
shorter bushings, 0.5" long with a hold inside diameter of
.21". They will mate with MIL plug M642/5-1 or M642/8-1.
M642/5-1 plug (Switchcraft 480) cannot be used with
? MT-342B or ? MT-344B if these jacks are mounted on standard
.625" thick panels. The short jack bushings are recessed
.125", and the M642/5-1 is too wide to fit in the panel recess.
Use plug M642/8-1 (Switchcraft 484) with a narrower
MT-Jax ?
(“C” Frame)
WMT-Jax ? , Number
WMT-332B
XMT-Jax ? , Number
XMT-332A
YMT-Jax ? , Number
YMT-332B
diameter to fit in the recess and mate properly.
CONTACTS – Contacts on shuts and isolated switching
circuits are welded crossbar palladium. Welded crossbar gold
alloy contacts (WEco #1) are available on special order for dry
circuit applications.
SPECIFICATIONS
Frame and Stack Screws: Plated steel, with iridescent
iridite finish.
Springs: Copper alloy, spring tempered. Solder lugs are tinned.
Bushings: Plated copper alloy standard. Natural brass finish
optional.
Insulation: Rigid plastic spacers (MIL-type PBE-P per
Details of Typical Buss Wiring of Jacks
with Offset Ground Lugs
Ground Lug “Toward”
Frame (Y Offset)
Buss Wire
Between
Rows
Buss Wire
Specification LP-513). One piece molded through stack.
Contacts: Welded crossbar palladium contacts in shunt and
isolated switching circuits are standard. Gold alloy (WEco #1)
and fine silver are available on special order.
MECHANICAL
Life: Commercial jacks: 10,000 insertion/withdrawal cycles, minimum.
Military Jacks: 20,000 insertion/withdrawal cycles, minimum.
Mechanical Shock: Military Jacks – Per MIL-STD-202,
method 213, Test Condition H (75g).
Vibration: Military Jacks – Per MIL-STD-202, method 213, (10-55 Hz).
ELECTRICAL
Ground Lug
“Toward” Frame
Ground Lug “Away”
from Frame (X Offset)
Outside of
Rows
Contact Resistance: Commercial Jacks – .030 ohms
maximum (initial), .050 ohms maximum (after humidity, durability
exposure). Military Jacks – .010 ohms maximum (initial), .020
Long frame jacks are designed especially for high quality
communication equipment, and to meet exacting MIL
specifications, as well as telephone and communication systems.
Many jacks have WEco equivalent types. MT-Jax ? phone jacks are
offered in four styles: MT-Jax ? , WMT-Jax ? , XMT-Jax ? and YMT-Jax ? .
Rugged steel frames are produced in specially designed dies,
press welded to provide rigidity and dimensional stability required
by telephone and communication jack panels - and to meet MIL
frame strength tests. “A” and “C” frame styles are available.
TERMINALS – Solder Lug: All MT-Jax ? have solder lug termi-
nals. Wire-Wrapping Terminals: WMT-Jax ? have wire-wrapping ter-
minals. Offset Ground Lugs: XMT-Jax ? and YMT-Jax ? have ground
lugs, which simplify production line wiring time. A single row of
jacks can be installed with a single buss wire connected to all
ground lugs in a row, or when double rows are mounted on .625"
vertical centers with lugs oriented between rows, holes in ground
lugs line up so a single buss wire provides connections for both
rows. XMT-Jax ? have ground lugs oriented away and YMT-Jax ? are
oriented toward jack frame. See illustration.
MIL STANDARDIZATION – MIL jack types listed have been
adjusted for use with plugs specified in Amendment No.1, MIL-P-642,
usually M642/1-1, M642/1-2, M642/2-1, M642/2-2, M642/4-1 or
M642/4-2. When applicable, specify the plug you will use; we will
adjust with that plug where the item is not a MIL-type. NOTE:
ohms maximum (after life), .10 ohms maximum (after salt spray).
Insulation Resistance: Commercial Jacks – 10,000 M ?
minimum (initial), 1,000 M ? minimum (after humidity). Military
Jacks – 10,000 M ? minimum (initial), 1,000 M ? minimum (after
humidity, durability exposure).
Dielectric Withstanding Voltage: 500 V, 60 Hz (rms) AC.
ENVIRONMENTAL
Thermal Range: Commercial Jacks – -55°C to +85°C
(non-operating); -20°C to +65°C (operating). Military Jacks -
-55°C to +85°C (non operating); -40°C to +65°C (operating).
Thermal Shock: Commercial Jacks – Per MIL-STD-202,
method 107. Military Jacks – Per MIL-STD-202, method 107.
Humidity: Commercial Jacks – Per MIL-STD-202, method
106. Military Jacks – 0% to 95% operating and non-operating.
Salt Spray: Commercial Jacks – Per MIL-STD-202, method
101. Military Jacks – Per MIL-STD-202, method 101 (48 hours).
Moisture Resistance: Military Jacks – Per MIL-STD-202,
method 106 (240 hours).
ORDERING – Order jacks by part number. Additional variations
in jacks are available on special order. Special circuitry, frames,
contacts, natural brass bushings, as other terminals are available.
DIMENSIONS ARE FOR REFERENCE ONLY
www.switchcraft.com
Inch
(mm)
? Registered trademark of Switchcraft, Inc.
Note: Contact your Switchcraft Representative for price and delivery
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