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MS3476 Plug

Features and Application

MIL-DTL-26482 Series 2,bayonet coupling,rear-removable crimp contact connectors were designed as an upgrade to MIL-DTL-26482 Series 1.Series 2 connectors are inter- mountable and interchangeable with both solder and front-release crimp Series 1.They are also identical to the inactivated MIL-DTL- 83723 Series I connectors.

Series 2 connectors are widely used on commercial,military and aerospace systems requiring general-purpose,miniature cylindrical bayonet coupling connectors.

This family ofconnectors is offered in 4 receptacle-mounting styles.They include narrow ?ange wall mounting receptacles, wide ?ange wall mounting receptacles,cable connecting receptacles and jam nut mounting receptacles which incorpo- rate “O”ring seals,designed for rear panel “D”hole mounting.

Plugs are available in two designs,with and without RFI grounding.

Thirty-three insert arrangements per MIL-STD-1669 are tooled and quali?ed to MIL-DTL-26482 Series 2,utilizing 3 to 61 M39029 contacts.Contacts come in sizes 20,16 and 12,terminating wire sizes from 24 to 12 gauge.

These connectors are available in wide range ofshell materials and ?nishes.Aluminum shells are offered in electroless nickel,olive drab cadmium and black anodic. Other ?nishes such as zinc cobalt are available upon request to commercial callouts only.In addition,we offer passivated stainless steel shells with standard environment-resisting inserts (commercial callouts only),and for highly corrosive environments,nickel-aluminum-bronze shells with standard environment-resisting inserts (commercial callouts only).

Universal I/R Tool – A single,expendable plastic tool is used for both insertion and removal ofcontacts.

Insert Polarization – Alternate insert clocking positions aid in mating ofadjacent connectors having identical insert arrangement.

Closed-Entry Socket Insert – Hard dielectric socket face has lead-in chamfers for positive alignment ofpins (even partially bent within pre-established limits) with sockets.

Interfacial Pin Insert Seal – Raised moisture barriers around each pin,which mate into lead-in chamfers ofhard face socket insert,provide individual contact sealing. Interfacial seal is never touched by service tools.

Elastomer Wire Sealing Grommet – Sealing over a wide range ofwire diameters is assured by a triple wire seal in each cavity at the rear ofthe connector.

Superior Contact Stability – Rear release crimp contact system features a stamped beryllium-copper retaining clip captivated by molded-in shoulders ofeach contact cavity in the insulator.A rear-inserted M81969 plastic tool expands the tines beyond the shoulder,releasing the contact.

Performance Specifications

Operating Temperature Range

Classes A,L and S*:-55°C to +200°C (-67°F to +392°F)

Classes W and ZC*:-55°C to +175°C (-67°F to +347°F)

Material and Finish Data (Class)

A–aluminum shell,black anodized ?nish

L–aluminum shell,electroless nickel ?nish

W–aluminum shell,olive drab cadmium over nickel base

S* –stainless steel shell,passivated

ZC*–aluminum shell,zinc cobalt ?nish

Corrosion Resistance

Classes A,S*,W and ZC* withstand 500-hour salt spray.

Class L withstands 48-hour salt spray.

Environmental Seal

Wired, mated connectors with speci?ed accessories attached,shall meet the altitude-immersion test speci?ed in MIL-DTL-26482 Series 2.

Fluid Resistance

Connectors resist speci?ed immersions in MIL-PRF-7808 (lubricating oil),MIL-PRF-23699 (lubricating oil), MIL-PRF-5606 (hydraulic ?uid),M2-V Chevron oil, Coolanol 25,ASTMD4814 (gasoline),SAE-AMS1424 Type I (defrosting ?uid),MIL-DTL-5624 (JP-5),and solvents speci?ed in Method 215 ofMIL-STD-202.

* Not on QPL,can be supplied to Aero-Electric P/N only.

Durability

Mated connectors withstand a minimum of250 mating cycles for RFI plug (MS3475) and 500 cycles for standard plug (MS3476).

Shock and Vibration Requirements

Wired,mated connectors shall not be damaged,coupling ring shall not loosen,and there shall be no interruption of electrical continuity longer than one microsecond when subjected to the following:

Shock

Wired,mated connectors shall not be damaged,coupling ring shall not loosen,and there shall be no interruption of electrical continuity longer than one microsecond when subjected to the following:

Vibration

Mated connectors withstand the following vibration levels:

Random vibration per MIL-STD-202,method 214,test condition II, letter J.

Shielding Effectiveness

RFI attenuation at the speci?ed frequency meets the requirements ofMIL-DTL-26482 Series 2.

RFI shielding effectiveness ofmated connectors with RFI backshells is measured in a triaxial radio frequency leakage fixture.

Shielding Effectiveness

With RFI spring ?ngers,the maximum potential drop shall not exceed 5 millivolts.

Without spring ?ngers,the maximum potential drop shall not exceed 200 millivolts.

Voltage Rating

ServiceRating	Suggested Operating Voltage**		Test Voltage	Test Voltage	Test Voltage	Test Voltage
	(Sea Level)		(Sea Level)	50,000 Ft.	70,000 Ft.	110,000 Ft.
	AC (RMS)	DC	V RMS	V RMS	V RMS	V RMS
I	600	850	1,500	500	375	200
II	1,000	1,275	2,300	750	500	200

** To be used by designer only as a guide.

Bayonet Coupling,Crimp Removable,Rear Release

Page 71 Completed Part Number

Page 80- Contacts, Sealing Plugs and Tools

Page 84, 85- Insert Arrangements

Page 80- Performance Speci?cations

Page 82,83- Insert Availability and Contact Information

Page 80- Polarization

ShellSize	A		B		C		D	E
	Maximum		±.003	±.08	Maximum		Accessory ThreadClass 2A	Maximum
	inch	mm	inch	mm	inch	mm		inch	mm
8	.285	7.24	.355	9.02	.782	19.86	1/2-20UNF	.305	7.75
10	.402	10.21	.483	12.27	.926	23.52	5/8-24UNEF	.405	10.29
12	.516	13.11	.595	15.11	1.043	26.49	3/4-20UNEF	.531	13.49
14	.641	16.28	.720	18.29	1.183	30.05	7/8-20UNEF	.665	16.89
16	.766	19.46	.845	21.46	1.305	33.15	1-20UNEF	.790	20.07
18	.855	21.72	.945	24.00	1.391	35.33	1-1/16-18UNEF	.869	22.07
20	.980	24.89	1.070	27.18	1.531	38.89	1-3/16-18UNEF	.994	25.25
22	1.105	28.07	1.195	30.35	1.656	42.06	1-5/16-18UNEF	1.119	28.42
24	1.229	31.22	1.320	33.53	1.777	45.14	1-7/16-18UNEF	1.244	31.60

Contacts,Plastic Insertion/Removal Tools and Seal Plugs

Contact Size	Application	Pin Contacts	Socket Contacts	Seal Plugs	Insertion/Removal Tools
					Plastic
	Type	Military No.	Military No.	Military No.	Military No.
20	Power/Signal	M39029/4-110	M39029/5-115	MS27488-20-1	M81969/14-11
16	Power/Signal	M39029/4-111	M39029/5-116	MS27488-16-1	M81969/14-03
12	Power/Signal	M39029/4-113	M39029/5-118	MS27488-12-1	M81969/14-04
20*	Power/Signal	5291-022-204H	5091-022-204H	MS27488-20-1	M81969/39-01

*Size 20 contacts for 8–2,8–3 and 8–4 layouts are only available to Aero-Electric part numbers.Connectors incorporating these three layouts are only sold to Aero-Electric callouts (AE770,AE771,AE772, AE774,AE775,AE776,AC3470,AC3471,AC3472,AC3474 and AC3475). Standard size 20 contacts M39029/4-110 and M39029/5-115 will not work in these 3 layouts.

Crimping and Metal Insertion/Extraction Tools

ContactSize	Crimp Tool	Positioner	Positioner	Insertion Tool	Extraction Tool
		For Pin Contacts	For Socket Contacts	Metal	Metal
	Military No.	Military No.	Military No.	Military No.	Military No.
20	M22520/1-01	M22520/1-02	M22520/1-02	M81969/8-205	M81969/8-206
	M22520/2-01	M22520/2-02	M22520/2-02
16	M22520/1-01	M22520/1-02	M22520/1-02	M81969/8-207	M81969/8-208
12	M22520/1-01	M22520/1-02	M22520/1-02	M81969/8-209	M81969/8-210
20*	M22520/1-01	M22520/1-02	M22520/1-02	M81969/8-205	M81969/8-206
	M22520/2-01	M22520/2-02	M22520/2-02

Contact and Wire Data

Contact Size	Test Current	Voltage	Crimp Well Data			Wire Range		Finished Wire Range
	DC Test	Max.Drop	Well Dia.	Minimum Well Dept				Minimum		Maximum
	Amps	Millivolts	inch	inch	mm	AWG	mm2	inch	mm	inch	mm
20	7.5	55	.049 ±.001	.155	3.94	24-20	.20-.52	.040	1.02	.083	2.11
16	13.0	49	.067 ±.001	.250	6.35	20-16	.52-1.31	.053	1.35	.103	2.62
12	23.0	42	.100 ±.002	.250	6.35	14-12	2.08-3.31	.097	2.46	.158	4.01

Note: Test Current and Maximum Voltage Drop when tested with silver-plated wire at 25°C.

Military and Aero-Electric Part Number Development

* Not on QPL, can be supplied to Aero part number only. Consult factory for availability.

Note 1:Each connector is furnished with contacts unless ordered less contacts (L/C) as follows: One spare contact for inserts requiring 2 to 26 of each contact and two spares for inserts with 27 or more of each size, and a minimum of one sealing plug up to 15% of the number of contacts. In addition, one plastic insetion/removal tool of each size is included.

Note 2:Proper part number marking has no “0” in front of single digit shell size ( 8) and no “0” after the dash between shell size and single digit layout. Example of each: MS3470W8-33P and MS3470W10-6P. In both “N” for normal was omitted.

Note 3:Insert layouts 8-2, 8-3 and 8-4 can only be ordered to Aero-Electric part number. Non standard contacts are required and to avoid confusion are sold “with contacts” only. See page 80 for the correct contact part numbers.