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1/4" LONG FRAME TELEPHONE JACKS

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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
ý CMT331
223C   I .438 (11.1)
ý WMT331
223AM ­ I .438 (11.1)
ý WCMT331
223CM ­ I .438 (11.1)
ý MT332 232A, 544A4
­ II .5 (12.7)
ý CMT332
232C ­ II .5 (12.7)
MT332A 218A
M641/2-3 III .5 (12.7)
ý CMT332A
218C ­ III .5 (12.7)
ý MT332C
303A M641/2-1 XVIII .562 (14.3)
MT333
215A M641/2-6 V .469 (11.9)
ý CMT333
215C ­ V .469 (11.9)
ý MT333E
237A ­ IX .625 (15.9)
ý CMT333A 237C ­ IX .625 (15.9)
MT334A 225A, 234A
­ XI .562 (14.3)
ý CMT334A
225C, 234C ­ XI
.562 (14.3)
MT334C
216A M641/2-5 XVII .625 (15.9)
ý CMT334C 216C, 484C5
­ XVII .625 (15.9)
MT334E 217A M641/2-7 XXV .562 (14.3)
ý CMT334E 217C
­ XXV .562 (14.3)
ý MT334F 226A M641/2-4 XIX .562 (14.3)
ý CMT334F 226C ­ XIX
.562 (14.3)
ý MT335 236A ­ XIII .562 (14.3)
ý CMT335
236C ­ XIII .562 (14.3)
ý MT336E10 438A ­
XXIII .75 (19.0)
CMT336E
438C M641/1-2 XXIII .75 (19.0)
ý MT33710
411A M641/2-9 XXIV .75 (19.0)
ý CMT337
411C M641/1-1 XXIV .75 (19.0)
ý CMT351C 394C ­ XXXIII .812 (20.6)
ý MT352A 218J ­ III .5 (12.7)
ý 361C ­ XXXIV .75 (19.0)


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
ý CMT332B
238C ­ IV .562 (14.3)
WMT332B 238AM ­ IV .562(14.3)
ý WCMT332B 238CM
­ IV .562 (14.3)
MT333B
300A ­ VII .562 (14.3)
ý MT334B
239A M641/3-2 XII .562 (14.3)
ý CMT334-B
239C ­ XII .562 (14.3)
WMT334B 239AM ­ XII
.578 (14.7)
ý WCMT334B
239CM ­ XII .578 (14.7)
ý MT336 241A M641/3-4 XX .562 (14.3)
ý CMT336
241C ­ XX .562 (14.3)
ý10 241AM
­ XX .625 (15.9)
ý 241CM ­
XX .625 (15.9)
ý10 242A M641/5-5
XIV .688 (17.5)
ý CMT336A
242C ­ XIV .688 17.5)
ý WMT336A 242AM
­ XIV .75 (19.0)
WCMT336A 242CM ­
XIV .75 (19.0)
ý10
285A M641/3-6 XXI .812 (20.6)
ý CMT336B 285C ­ XXI .812 (20.6)
MT336C10 240A
M641/3-3 XXII .688 (17.5)
ý CMT336C 240C
­ XXII .688 (17.5)
ý WMT336C10
240AM ­ XXII .75 (19.0)
ý WCMT336C
240CM ­ XXII .75 (19.0)
ý MT336D10
280A ­ XXXI .75 (19.0)
ý CMT336D 280C ­
XXXI .75 (19.0)
ý WMT336D10
280AM ­ XXXI .938 (23.8)
ý WCMT336D
280CM ­ XXXI .938 (23.8)
ý MT338 267A
­ XXXII .562 (14.3)
ý CMT338
267C ­ XXXII .562 (14.3)
ý MT33910
284A6 M641/3-7 XXVII .967 (24.6)
ý
384C6 ­ XXVII .967 (24.6)
ý MT342B 246A ­ IV .563 (14.3) M642/5-1


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
ý WMT342B 246 AM
­ IV .562 (14.3) M642/5-1
ý MT344B 248A ­ XII .625 (15.9)
ý MT346
249A ­ XX .562 (14.3)
ý CMT346 249C ­ XX .562 (14.3)
ý MT354B 248E ­ XII .625 (15.9)
ý MT35510 243C ­ XXXV
.812 (20.6)10 M642/5-1
or
M642/2-2
ý MT356C10 245A ­
XXXVI .938 (23.8)10
ý CMT356C
245C ­ XXXVI .938 (23.8)
ý MT35710 363A ­ XXXVII .75 (19.0)10
ý CMT358
290C ­ XXXVIII .875 (22.2)
ý CMT359 326C ­ XXXIX .75 (19.0)


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
ý WCMT332A ­ III .5 (12.7)
XMT332A 7 III .5 (12.7)
ý YMT332A 7 III .5 (12.7)
ý CMT332C ­ XVIII .562 (14.3)
ý WMT332C ­ XVIII .5 (12.7)
ý VWMT333 ­ V .469 (11.9)
ý WCMT333 ­ V .469 (11.9)
ý MT333A ­ VI .967 (24.6)
ý WMT333E ­ IX .625 (15.9)
ý WMT334A ­ XI .562 (14.3)
ý WMT334C ­ XVII .562 (14.3)
ý WMT334E ­ XXV .562 (14.3)
ý WMT334A ­ XI .562 (14.3)
ý WMT334C ­ XVII .562 (14.3)
ý WMT334E ­ XXV .562 (14.3)
ý WMT334F ­ XIX .641 (16.3)
WMT33510 ­ XIII .688 (17.5)
ý WCMT335 ­ XIII .688 (17.5)
MT335A10 M641/2-2 XXVI .75 (19.0)
ý CMT335A ­ XXVI .75 (19.0)
ý WMT335A ­ XXVI .75 (19.0)
ý WCMT335A ­ XXVI .75 (19.0)
ý WMT336E10 ­ XXIII .875 (22.2)
ý WCMT336E ­ XXIII .875 (22.2)
ý CMT341 ­ I .438 (11.1)


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)
ý CMT333B ­ VII .562 (14.3)
ý WMT333B ­ VII .562 (14.3)
XMT334B 9 XII .562 (14.3)
ý YMT334B10 9 XII .562 (14.3)
ý WMT336B ­ XXI .812 (20.6)
ý WCMT336B ­ XXI .812 (20.6)
ý MT343B ­ VII .5 (12.7)
ý CMT342B ­ IV .562 (14.3) M642/5-1
ý CMT344B ­ XII .625 (15.9)
ý WMT344B ­ XII .625 (15.9)
ý MT346A10 ­ XIV .688 (17.5)
ý MT346B10 ­ XXI .812 (20.6)
ý MT346C10 ­ XXII .688 (17.5)
ý CMT346C ­ XXII .688 (17.5) M642/2-1 or M642/2-21


* Refer to page 65 and 66 for schematics.
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.
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 inches horizontal space add prefix "C" to part number
to order jacks with "C" frame.

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