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LONG FRAME TELEPHONE JACKS
MT-JAX (with WEco Equivalent Jacks) 2
JACKS AND PLUGS
FAX: 773 792-2129
* Please visit the product pages on our website for the most up-to-date product information
1/4" LONG FRAME TELEPHONE JACKS
?
83
Sche-
Dim. “X”
Sche-
Dim. “X”
Switchcraft
Part Number
WEco
Equiv.
MIL
Type1
matic
Circuit*
maximum
Inch (mm)
Mating
Plug3
Switchcraft
Part Number
WEco
Equiv.
MIL
Type 1
matic
Circuit*
maximum
Inch (mm)
Mating
Plug 3
2-CONDUCTOR 2
3-CONDUCTOR
MT331
233A,
MT332B
238A
M641/3-1 IV
.562 (14.3)
221E3
M641/2-8
I
.438 (11.1)
? CMT332B
238C
– IV
.562 (14.3)
? CMT331
? WMT331
? WCMT331
223C
223AM
223CM
–
–
–
I
I
I
.438 (11.1)
.438 (11.1)
.438 (11.1)
WMT332B
? WCMT332B
MT333B
238AM
238CM
300A
– IV
– IV
– VII
.562(14.3)
.562 (14.3)
.562 (14.3)
? MT332
232A,
? MT334B
239A
M641/3-2 XII
.562 (14.3)
544A4
–
II
.5 (12.7)
? CMT334-B
239C
– XII
.562 (14.3)
? CMT332
MT332A
? CMT332A
? MT332C
MT333
232C
218A
218C
303A
215A
–
M641/2-3
–
M641/2-1
M641/2-6
II
III
III
XVIII
V
.5 (12.7)
.5 (12.7)
.5 (12.7)
.562 (14.3)
.469 (11.9)
WMT334B
? WCMT334B
? MT336
? CMT336
? WMT336 10
239AM
239CM
241A
241C
241AM
– XII
– XII
M641/3-4 XX
– XX
– XX
.578 (14.7)
.578 (14.7)
.562 (14.3)
.562 (14.3)
.625 (15.9)
? CMT333
? MT333E
? CMT333A
MT334A
? CMT334A
215C
237A
237C
225A,
234A
225C,
–
–
–
–
V
IX
IX
XI
.469 (11.9)
.625 (15.9)
.625 (15.9)
.562 (14.3)
M642/4-1
M642/4-2
or
M642/4-3
? WCMT336
? MT336A 10
? CMT336A
? WMT336A
? WCMT336A
? MT336B 10
241CM
242A
242C
242AM
242CM
285A
– XX
M641/5-5 XIV
– XIV
– XIV
– XIV
M641/3-6 XXI
.625 (15.9)
.688 (17.5)
.688 17.5)
.75 (19.0)
.75 (19.0)
.812 (20.6)
M642/2-1
or
M642/2-2
234C
–
XI
.562 (14.3)
? CMT336B
285C
– XXI
.812 (20.6)
MT334C
216A
M641/2-5
XVII
.625 (15.9)
MT336C 10
240A
M641/3-3 XXII
.688 (17.5)
? CMT334C
216C,
? CMT336C
240C
– XXII
.688 (17.5)
484C5
–
XVII
.625 (15.9)
? WMT336C 10
240AM
– XXII
.75 (19.0)
MT334E
? CMT334E
? MT334F
? CMT334F
? MT335
? CMT335
? MT336E 10
CMT336E
? MT337 10
217A
217C
226A
226C
236A
236C
438A
438C
411A
M641/2-7
–
M641/2-4
–
–
–
–
M641/1-2
M641/2-9
XXV
XXV
XIX
XIX
XIII
XIII
XXIII
XXIII
XXIV
.562 (14.3)
.562 (14.3)
.562 (14.3)
.562 (14.3)
.562 (14.3)
.562 (14.3)
.75 (19.0)
.75 (19.0)
.75 (19.0)
? WCMT336C
? MT336D 10
? CMT336D
? WMT336D 10
? WCMT336D
? MT338
? CMT338
? MT339 10
? CMT339
240CM
280A
280C
280AM
280CM
267A
267C
284A6
384C6
– XXII
– XXXI
– XXXI
– XXXI
– XXXI
– XXXII
– XXXII
M641/3-7 XXVII
– XXVII
.75 (19.0)
.75 (19.0)
.75 (19.0)
.938 (23.8)
.938 (23.8)
.562 (14.3)
.562 (14.3)
.967 (24.6)
.967 (24.6)
? CMT337
411C
M641/1-1
XXIV
.75 (19.0)
? MT342B
246A
– IV
.563 (14.3)
M642/5-1
? CMT351C
? MT352A
394C
218J
–
–
XXXIII
III
.812 (20.6)
.5 (12.7)
? CMT354F
361C
–
XXXIV
.75 (19.0)
MT-JAX (WITH WECO EQUIVALENT JACKS) 2
*Refer to page 79 and 80 for schematics.
? 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
Switchcraft
Part Number
WEco
Equiv.
MIL
Type 1
Sche-
matic
Circuit*
Dim. “X”
maximum
Inch (mm)
Mating
Plug 3
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).
? WMT342B
MT344B
246 AM
248A
3-CONDUCTOR 2
– IV
– XII
.562 (14.3)
.625 (15.9)
3. Mating plugs and patch cords are contained in the catalog.
? MT346
249A
– XX
.562 (14.3)
M642/5-1
.938 (23.8)
.75 (19.0)10
4.    Adjust non-short tip-ring.
5. Adjusted for plug M642/1-1 or M642/1-2.
6. Actuates differently (insulated “A” off ring instead of tip).
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" horizontal space add prefix “C” to part number
to order jacks with “C” frame.
? CMT346
? MT354B
? MT355 10
? MT356C 10
? CMT356C
? MT357 10
? CMT358
? CMT359
249C
248E
243C
245A
245C
363A
290C
326C
– XX
– XII
– XXXV
– XXXVI
– XXXVI
– XXXVII
– XXXVIII
– XXXIX
.562 (14.3)
.625 (15.9)
.812 (20.6)10
.938 (23.8)10 M642/5-1
or
M642/2-2
.875 (22.2)
.75 (19.0)
DIMENSIONS ARE FOR REFERENCE ONLY
Inch
(mm)
SWITCHCRAFT, INC. 5555 N. Elston Ave. ? Chicago, IL 60630
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