Switchcraft

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MIL-TYPE 1/4" TWIN PHONE PLUGS

1. 411
2. 414
3. 412
4. 415

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FEATURES
Design and material strictly in accordance with Specification MIL-P-642(A), MIL part number molded or stamped on handle, manufacturer's trademark (as required in MIL Specification) appears on plug body. Ideal for use in broadcast and recording studios, military, industrial and telephone switchboard applications, instrumentation and telemetry.
Individual plugs, featuring one-piece tip rod and one-piece sleeve and plug body, with complete continuity of thermoplastic insulation between plug elements, are placed into handles to provide a double Twin-Plug® plug (two electrically-independent 2-conductor plugs spaced .625 inch center-to-center, with self-alignment feature). 411, 414 and 415 Twin-Plug plugs have provision for use of Cord Clamp Number S2674. 412 Twin-Plug has external Cord Anchor.
6-conductor Twin-Plug, 414 and 415, provide two electrically-independent 3-conductor plug fingers spaced on .625 inch centers. Fingers are insulated from each other and each provides tip, ring and sleeve connections. Black plastic handle is notched to indicate polarity. Accepts standard 6-conductor cables. Handle has provision for use of Cord Clamp, S2674.
Fingers of 414 are .25 inch diameter and mate with Switchcraft type MT389 Twin-Jax, MT333B, MT336 MT-Jax®, and other jacks having .25 inch inside diameter sleeves and mounted on .625 inch centers. 415 has a .25 inch diameter finger and a .206 inch diameter finger to provide automatic polarization. Fingers mate with Switchcraft MT332B and MT342B MT-Jax, respectively.
STRAIN RELIEF CLAMP
Natural brass. For use only with 411, 414, 415 Twin-Plug, S2674.
SPECIFICATIONS
Tip, Rod, Ring Sleeve, Body, Screws: Copper alloy, natural
finish. Number 412 Handle Screws - iridescent iridite over
plating.
Terminals: Tinned copper alloy. (Latest MIL Specifications
no longer specify terminals; terminal furnished is the type
referenced as TM-89).
Insulation: Thermoplastic; per MIL-P-22985, Type II, Class 1.
Handle: Thermoplastic on 411, 412, 414 and 415, per
MIL-P-22985, Type II, Class 4. Molded black thermoset
plastic per MIL-M-14F.

Part No. Cond. Terminals Typical Mating Jack¹ Handle Handle Part No. MIL No. Notes

411 2, Two Independent Fingers Screw² MT388 Black Screw Part. No P1382 & Nut P1383 (3 req.) M1105 & M1006 (2 piece) M642/9-1 Provision for internal cord clamp (not incl.)

412 2, Two Independent Fingers Screw² MT388 Black Screw Part No. P1384 (2 req.) M1107 & M1108 (2 piece) -- MILPJ289. Similar to WECO 289B

414 3, Two Fingers Screw³ MT389 Black (Polarized) Screw Part No. P1382 & Nut. No. P1383 (3 req.) T1929 & T2321 (2 piece) -- 6 circuit plug, 2 electrically-independent 3-cond., .25 in. dia. fingers. Provision for internal cord clamp (not incl.) Similar to WECo 338A, 425 A-3

415 3, Two Fingers Screw³ 1, MT332B & 1, MT342B Black, Screw Part. No. P1382 -- Nut. No. P1389 T1929 & T2321 (2 piece) -- 6 circuit plug, 2 electrically-independent 3-cond. fingers, one .25 in. finger
one .206 in. finger. Provision for internal cord clamp (not incl.)

¹ Switchcraft Part Numbers. See Jacks Section for other mating jacks.
² Switchcraft Replacement screw P1070, Terminal Number P10695, 4 each required per plug.
³ Switchcraft Replacement Parts; 4 1070 screws; 6 Number P10695 terminals.

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Part No.	Cond.	Terminals	Typical Mating Jack¹	Handle	Handle Part No.	MIL No.	Notes
411	2, Two Independent Fingers	Screw²	MT388	Black Screw Part. No P1382 & Nut P1383 (3 req.)	M1105 & M1006 (2 piece)	M642/9-1	Provision for internal cord clamp (not incl.)
412	2, Two Independent Fingers	Screw²	MT388	Black Screw Part No. P1384 (2 req.)	M1107 & M1108 (2 piece)	--	MILPJ289. Similar to WECO 289B
414	3, Two Fingers	Screw³	MT389	Black (Polarized) Screw Part No. P1382 & Nut. No. P1383 (3 req.)	T1929 & T2321 (2 piece)	--	6 circuit plug, 2 electrically-independent 3-cond., .25 in. dia. fingers. Provision for internal cord clamp (not incl.) Similar to WECo 338A, 425 A-3
415	3, Two Fingers	Screw³	1, MT332B & 1, MT342B	Black, Screw Part. No. P1382 -- Nut. No. P1389	T1929 & T2321 (2 piece)	--	6 circuit plug, 2 electrically-independent 3-cond. fingers, one .25 in. finger one .206 in. finger. Provision for internal cord clamp (not incl.)
¹ Switchcraft Part Numbers. See Jacks Section for other mating jacks. ² Switchcraft Replacement screw P1070, Terminal Number P10695, 4 each required per plug. ³ Switchcraft Replacement Parts; 4 1070 screws; 6 Number P10695 terminals.