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| 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. |
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| 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.
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| 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. |
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| 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. |
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| 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. |
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| 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 |
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| ** To be used by designer only as a guide. |
| Bayonet Coupling,Crimp Removable,Rear Release |
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| 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 |
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| 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 |
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| *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 | | |
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| 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 |
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| Note: Test Current and Maximum Voltage Drop when
tested with silver-plated wire at 25°C. |
Military and Aero-Electric Part Number Development
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* 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.
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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.
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