1. MT-Jax®
("A" Frame and "C" Frame respectively)
2. XMT -Jax®, Number
XMT-332A (Offset Ground Lug "AWAY" from Frame)
3. WMT -Jax®, Number
WMT-332B (Wire-Wrapping Terminals)
4. YMT -Jax®, Number YMT-332B
(Offset Ground Lug
"TOWARD" Frame)
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 terminals. Wire-Wrapping Terminals: WMT-Jax have wire-wrapping terminals. 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 inch 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.
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.
NOTE: MT-Jax jacks Numbers ×MT-342B and ×MT-344B have shorter bushings, 0.5 inches long with a hold inside diameter of .21 inches. 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 inch thick panels. The short jack bushings are recessed .125 inch, and the M642/5-1 is too wide to fit in the panel recess. Use plug M642/8-1 (Switchcraft 484) with a narrower 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 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.
SPECIFICATIONS
MECHANICAL
Life: Commercial jacks10,000 insertion/withdrawal
cycles, minimum.
Military Jacks--20,000 insertion/withdrawal cycles, mimimum.
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
Contact Resistance: Commercial Jacks.030 ohms
maximum (initial), .050 ohms maximum (after humidity,
durability exposure).
Military Jacks.010 ohms maximum (initial), .020 ohms
maximum (after life), .10 ohms maximum (after salt spray).
Insulation Resistance: Commercial jacks10,000 M(omega)
minimum (initial), 1,000 M(omega) minimum (after humidity).
Military Jacks10,000 M(omega) minimum (initial), 1,000 M(omega)
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 JacksPer MIL-STD-202,
method 107.
Military Jacks: Per MIL-STD-202, method 107.
Humidity: Commercial JacksPer MIL-STD-202,
method 106.
Military Jacks--0% to 95% operating and non-operating.
Salt Spray: Commercial JacksPer MIL-STD-202,
method 101.
Military JacksPer MIL-STD-202, method 101 (48 hours).
Moisture Resistance: Military JacksPer 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.
MT-JAX® (WITH WEco EQUIVALENT JACKS)2
Switchcraft
Part Number
|
WEco Equiv. |
MIL Type1 |
Schematic
Circuit
|
Dim. "X"
maximum Inch (mm)
|
Mating Plug3 |
| 2-CONDUCTOR2 |
| MT331
|
233A,
221E3
|
M641/2-8 |
I |
.438 (11.1) |
M642/4-1 M642/4-2 or
M642/4-3 |
| MT332A |
218A
|
M641/2-3 |
III |
.5 (12.7) |
| MT333
|
215A |
M641/2-6 |
V |
.469 (11.9) |
| ý CMT333
|
215C |
|
V |
.469 (11.9) |
| ý MT334F |
226A |
M641/2-4 |
XIX |
.562 (14.3) |
| ý CMT334F |
226C |
|
XIX |
.562 (14.3) |
Switchcraft
Part Number
|
WEco Equiv. |
MIL Type1 |
Schematic
Circuit
|
Dim. "X"
maximum Inch (mm)
|
Mating Plug3 |
| 3-CONDUCTOR
|
| MT332B
|
238A |
M641/3-1 |
IV |
.562 (14.3) |
M642/2-1 or M642/2-2
|
| WMT332B |
238AM |
|
IV |
.562(14.3) |
| MT333B
|
300A |
|
VII |
.562 (14.3) |
| ý MT334B
|
239A |
M641/3-2 |
XII |
.562 (14.3) |
| WMT334B |
239AM |
|
XII
|
.578 (14.7) |
| ý MT336 |
241A |
M641/3-4 |
XX |
.562 (14.3) |
| ý CMT336
|
241C |
|
XX |
.562 (14.3) |
| ý CMT336A
|
242C |
|
XIV |
.688 17.5) |
| WCMT336A |
242CM |
|
XIV |
.75 (19.0) |
| ý CMT336B |
285C |
|
XXI |
.812 (20.6)
|
| MT336C10 |
240A
|
M641/3-3 |
XXII |
.688 (17.5) |
| ý CMT336C |
240C
|
|
XXII |
.688 (17.5) |
MT-JAX (WITH WECO EQUIVALENT JACKS)2
Switchcraft
Part Number
|
WEco Equiv. |
MIL Type1 |
Schematic
Circuit
|
Dim. "X"
maximum Inch (mm)
|
Mating Plug3 |
| 3-CONDUCTOR2
|
| |
|
|
|
|
M642/5-1
|
| ý MT344B |
248A |
|
XII |
.625 (15.9) |
| ý MT346
|
249A |
|
XX |
.562 (14.3) |
| ý CMT346 |
249C |
|
XX |
.562 (14.3)
|
MT-JAX® (Industry Standard - No WEco Equivalent)2
Switchcraft
Part Number
|
MIL Type1 |
Schematic
Circuit
|
Dim. "X"
maximum Inch (mm)
|
Mating Plug3 |
| 2-CONDUCTOR2 |
| ý WMT332A |
|
III |
.5 (12.7) |
M642/4-1
M642/4-3 or
M642/4-2 |
| MT335A10 |
M641/2-2 |
XXVI |
.75 (19.0) |
Switchcraft
Part Number |
MIL Type1 |
Schematic
Circuit |
Dim. "X"
maximum Inch (mm) |
Mating Plug3 |
| 3-CONDUCTOR3 |
| XMT332B |
8 |
IV |
.562 (14.3) |
M642/2-1 or M642/2-2 |
| ý YMT332B |
8 |
IV |
.562 (14.3) |
| XMT334B |
9 |
XII |
.562 (14.3) |
| ý YMT334B10 |
9 |
XII |
.562 (14.3) |
| ý |
Special order only; contact Switchcraft. |
| 1 |
Many jacks are offered with MIL specifications. Other
jacks
are made of MIL-spec materials but do not have MIL approval
because no MIL type numbers have been assigned. |
| 2 |
MT-Jax have nickel-plated copper alloy bushing. WEco
equivalent jacks
have plain copper alloy bushings (except WEco Number 221E, which has
nickel-plated copper alloy bushing). |
| 3 |
Mating plugs and patch cords are contained in the
catalog. |
| 7 |
Same as MIL type M641/2-3 except with offset ground lug. |
| 8 |
Same as MIL type M641/3-1 except with offset ground lug. |
| 9 |
Same as MIL type M641/3-2 except with offset ground lug. |
| 10 |
When mounted on "A" frames, stacks are too high
to fit in standard
panels with .625 inches horizontal space add prefix "C" to
part number
to order jacks with "C" frame. |
