MIL-DTL-38999 SERIES 3 - CRIMP - milspecwest.com · MIL-DTL-38999 SERIES 3 - CRIMP 1 ... coupling system, utilizing self-locking acme thread. ... giving it a design replacement

Milspecwest - 31872 Via Montura - San Juan Capistrano, CA 92675

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MIL-DTL-38999 SERIES 3 - CRIMP

1

MIL-DTL-38999 Series III is the newest cylindrical

connector designed for highest performance capabilities

used in both general purpose and severe environment

applications.

These connectors feature an improved “one-turn”

coupling system, utilizing self-locking acme thread.

Acme threads provide coupling durability, while thicker

wall sections and greater coupling surface area improve

strength and shock resistance. Blunting of the threads

on both receptacle and plug coupling nut eliminates

cross threading.

Elongated mounting holes permit the Series III Connector to intermount with various

existing Mil-spec flange mounted receptacles, giving it a design replacement

advantage.

Wall mount receptacle, jam nut receptacle and straight self-locking RFI plug are

offered in 9 shell sizes and 54 insert arrangements utilizing M39029 contacts in sizes

22D, 20, 16, 12, 10 power and 8 twinax.

These connectors are available in wide range of shell materials and finishes.

Aluminum shells are offered in electroless nickel and olive drab cadmium. Other

finishes such as anodic and zinc cobalt are available upon request to commercial

callouts only. In addition, we offer stainless steel shells (both passivated and electro-

deposited nickel plated) with firewall inserts, and for highly corrosive environments,

nickel-aluminum-bronze shells with standard environment-resisting inserts

(commercial callouts only).

MIL-STD-1560 Insert Arrangements – Series III connectors use insert patterns and

contacts common to Series I, making for an easy transition from bayonet to triple-lead,

acme-thread, self-locking coupling.

Metal-to-Metal Bottoming – This feature precludes relative shell-to-shell motion, which

may result in ordinary connector wear and moisture entrapment.

Lockwiring Eliminated – Self-locking quick coupling plug eliminates the need for

lockwiring.

Firewall Capability - Stainless steel shells in both K and S firewall classes are offered.

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

removal of contacts.

Scoop-Proof Design – Recessed pins in elongated shells minimize the possibility for

contact damage. In a blind mating application, mating shells cannot “scoop” the pins, and

cause a shorting or bending of contacts

Superior Contact Stability – Rear release crimp contact system features a stamped

beryllium-copper retaining clip captivated by molded-in shoulders of each contact cavity in

the insulator. A rear-inserted M81969 plastic tool expands the tines beyond the shoulder,

releasing the contact.



MIL-C-38999 SERIES III M

IL-C

-38999

III

Operating Temperature Range: -65°C to +200°C (-85°F to +392°F) Durability: Minimum of 500 mating cycles. Shock and Vibration Requirements: When tested as follows the connector shall sustain no physical damage or electrical discontinuity exceeding one microsecond. Standard Shock: Pulse of an approximate half sine wave of 300 G magnitude with duration of 3 milliseconds applied in three axes. High Impact Shock: When mounted as specified in MIL-S-901, Grade A, a drop of a 400 lb. hammer from 1 foot, 3 feet, and 5 feet applied to connector in three axes, totaling nine impacts. Vibration: Sine: Frequency range of 10 to 2000 Hz, in a 20 minute sweeps, in 3 axes, with the following variations: -Duration: 12 hours total, 4 hour cycles. - Level: Displacement of .06 inch [1.5 mm] (10-100 Hz) and acceleration of 30 G's peak (100-2000 Hz) at ambient room temperature. Random: -(without simulated accessory load): 49.5 G RMS for 8 hours in two axes, totaling 16 hours at ambient temperature. RFI & EMI: RFI & EMI attenuation at the specified frequency meet the requirements of MIL-C-38999. RFI shielding effectiveness of mated connectors with RFI backshells is measured in a triaxial radio frequency leakage fixture. EMI shielding effectiveness is measured at the interface of mated connectors and tested by the MODE STIR procedure specified in method 3008 of MIL-STD-1344. Voltage Rating

Altitude Service Rating

ft. m M I II

Sea Level - 1300 1800 2300

50,000 15,240 800 1000 1000

70,000 21,336 800 1000 1000

100,000 30480 800 1000 1000

Contact Current Rating and Retention

Contact Retention

Current Rating Axial Load

Contact Size* DC Test Amperage lb N

22D 5.0 10 44.5

20 7.5 15 66.7

16 13.0 25 111.2

12 23.0 25 111.2

*Organize individual circuits to maintain heat rise within operating temperature requirements.

Contacts and Sealing Plugs

Contact Size Wire Range Socket Contacts Pin Contacts Sealing Plugs

AWG mm2 Military Part No. Military Part No. Military Part No.

22D 28-22 0.08-0.4 M39029/56-348 M39029/58-360 MS27488-22

20 24-20 0.2-0.6 M39029/56-351 M39029/58-363 MS27488-20

16 20-16 0.5-1.4 M39029/56-352 M39029/58-364 MS27488-16

12 14-12 2-3 M39029/56-353 M39029/58-365 MS27488-12

Insertion/Extraction Tools

Contact Size Tool Color Code Military Part No.

22D Green/White M81969/14-01

20 Red/White M81969/14-10

16 Blue/White M81969/14-03

12 Yellow/White M81969/14-04

Crimping Tools

Contact Size Wire Range Finished Wire Dia. Range Contact Type Crimping Tool Turret or Positioner

AWG mm2 Inch mm

22D 28-22 0.08-0.4 .030-.054 0.76-1.37 P S

M22520/2-01 M22520/2-01

M22520/2-09 M22520/2-07

20 24-20 0.2-0.6 .040-.083 1.02-2.11 P & S M22520/1-01 M22520/1-02

16 20-16 0.5-1.4 .053-.103 1.34-2.62 P & S M22520/1-01 M22520/1-02

12 14-12 2-3 .097-.142 2.46-4.01 P & S M22520/1-01 M22520/1-04

79

Performance Specifications



MIL-C-38999 III – PART NUMBERING SYSTEM

MIL

-C-3

8999

III

D38999/ 20 F B 35 P N Shell Keying Position: Use N for Normal. Contact Style: P = Pin S = Socket Insert Arrangement

Shell Size:

A=9, B=11, C=13, D=15, E=17, F=19, G=21, H=23, J=25

Class: W = Aluminum, olive drab over cadmium plate F = Aluminum, electroless nickel plating J = Composite, olive drab cadmium plate M = Composite, electroless nickel plating S = Stainless steel, electro-deposited nickel K = Stainless steel, passivated

Shell Style MS Number

80



MIL-C-38999 III – POLARIZATION

81

Angles in Degrees Shell Size

Key and Keyway Identification

Letter A B C D

9 N 105 140 215 265

A 102 132 248 320

B 80 118 230 312

C 35 140 205 275

D 64 155 234 304

E 91 131 197 240

11,13 AND 15 N 95 141 208 236

A 113 156 182 292

B 90 145 195 252

C 53 156 220 255

D 119 146 176 298

E 51 141 184 242

17 AND 19 N 80 142 196 293

A 135 170 200 310

B 49 169 200 244

C 66 140 200 257

D 62 145 180 280

E 79 153 197 272

21,23 AND 25 N 80 142 196 293

A 135 170 200 310

B 49 169 200 244

C 66 140 200 257

D 62 145 180 280

E 79 153 197 272

MIL

-C-3

8999

III



MIL-C-38999 III – INSERT ARRANGEMENTS

82

MIL

-C-3

8999

III



MIL-C-38999 III – INSERT ARRANGEMENTS

83

MIL

-C-3

8999

III



D38999/20 – RECEPTACLE, FLANGE WALL MOUNT THREADED COUPLING

Shell Size

A +/-0.30

B +/-0.26

C +/-0.26

D +0.10 -0.05

E +.010 -0.05

G Max.

H Max.

L Triple StartThread (0.1P-0.3L)

M Thrd. Metric (1.0-6g 0.100R)

K Max J

Teeth

9 A .937

[23.80] .719

[18.26] .594

[15.09] .216

[5.49] .128

[3.25] .823

[20.90] .099

[2.50] .6250 M12

.299 [7.59]

12

11 B 1.031 [26.20]

.812 [20.62]

.719 [18.26]

.173 [4.39]

.128 [3.25]

.823 [20.90]

.099 [2.50]

.7500 M15 .427

[10.85] 16

13 C 1.126 [28.60]

.906 [23.01]

.812 [20.62]

.194 [4.93]

.128 [3.25]

.823 [20.90]

.099 [2.50]

.875 M18 .541

[13.74] 20

15 D 1.220 [31.00]

.969 [24.61]

.906 [23.01]

.194 [4.93]

.128 [3.25]

.823 [20.90]

.099 [2.50]

1.000 M22 .666

[16.92] 24

17 E 1.311 [33.30]

1.062 [26.97]

.969 [24.61]

.194 [4.93]

.128 [3.25]

.823 [20.90]

.099 [2.50]

1.1875 M25 .791

[20.09] 28

19 F 1.437 [36.50]

1.156 [29.36]

1.062 [26.97]

.194 [4.93]

.128 [3.25]

.823 [20.90]

.099 [2.50]

1.2500 M28 .897

[22.78] 32

21 G 1.563 [39.70]

1.250 [31.75]

1.062 [29.36]

.194 [4.93]

.128 [3.25]

.792 [20.10]

.126 [3.20]

1.3750 M31 1.022 [25.96]

36

23 H 1.689 [42.90]

1.375 [34.93]

1.250 [31.75]

.242 [6.15]

.154 [3.91]

.792 [20.10]

.126 [3.20]

1.500 M34 1.147 [29.13]

40

25 J 1.811 [46.00]

1.500 [38.10]

1.375 [34.93]

.242 [6.15]

.154 [3.91]

.792 [20.10]

.126 [3.20]

1.625 M37 1.272 [32.31]

44

84

MIL

-C-3

8999

III



D38999/24 – RECEPTACLE, JAM NUT MOUNT THREADED COUPLING

Shell Size

A +/-0.016

B +.004 -.006

C D

+.016 -.004

G +.028 -.004

J Max. H

Max.

K Triple Start

Thread Class

2A

L Thread

M Thread

N Teeth

9 A 1.063 [27.00]

.651 [16.53]

.945/.859 [24.00]/[21.82]

.555 [14.10]

.087 [2.20]

.299 [7.59]

.099 [2.50]

.6250-0.1P-0.3L

M17 X 1.0-6g 0.100R

M12 X 1.0-6g 0.100R

12

11 B 1.252 [31.80]

.751 [19.07]

1.063/.984 [27.00]/[24.99]

.555 [14.10]

.087 [2.20]

.427 [10.85]

.099 [2.50]

.7500-0.1P-0.3L

M20 X 1.0-6g 0.100R

M15 X 1.0-6g 0.100R

16

13 C 1.374 [34.90]

.938 [23.82]

1.260/1.172 [32.00]/[29.77]

.563 [14.30]

.087 [2.20]

.541 [13.74]

.099 [2.50]

.8750-0.1P-0.3L

M25 X 1.0-6g 0.100R

M18 X 1.0-6g 0.100R

20

15 D 1.500 [38.10]

1.062 [26.97]

1.417/1.296 [36.00]/[32.91]

.563 [14.30]

.087 [2.20]

.666 [16.92]

.099 [2.50]

1.000-0.1P-0.3L

M28 X 1.0-6g 0.100R

M22 X 1.0-6g 0.100R

24

17 E 1.626 [41.30]

1.187 [30.15]

1.457/1.422 [37.00]/[36.12]

.563 [14.30]

.087 [2.20]

.791 [20.09]

.099 [2.50]

1.1875-0.1P-0.3L

M32 X 1.0-6g 0.100R

M25 X 1.0-6g 0.100R

28

19 F 1.811 [46.00]

1.312 [33.32]

1.614/1.546 [41.00]/[39.26]

.563 [14.30]

.118 [3.00]

.897 [22.78]

.099 [2.50]

1.2500-0.1P-0.3L

M35 X 1.0-6g 0.100R

M28 X 1.0-6g 0.100R

32

21 G 1.937 [49.20]

1.437 [36.50]

1.811/1.672 [46.00]/[42.47]

.563 [14.30]

.118 [3.00]

1.022 [25.96]

.126 [3.20]

1.3750-0.1P-0.3L

M38 X 1.0-6g 0.100R

M31 X 1.0-6g 0.100R

36

23 H 2.063 [52.40]

1.562 [39.67]

1.969/1.796 [50.00]/[45.61]

.563 [14.30]

.118 [3.00]

1.147 [29.13]

.126 [3.20]

1.500-0.1P-0.3L

M41 X 1.0-6g 0.100R

M34 X 1.0-6g 0.100R

40

25 J 2.189 [55.60]

1.687 [1.562]

2.017/1.939 [51.23]/[49.25]

.563 [14.30]

.118 [3.00]

1.272 [32.31]

.126 [3.20]

1.625-0.1P-0.3L

M44 X 1.0-6g 0.100R

M37 X 1.0-6g 0.100R

44

85

MIL

-C-3

8999

III



D38999/26 – PLUG, EMI GROUNDING THREADED COUPLING

Shell Size

A Max B

Teeth C +/- 0.26

D Triple StartThread (0.1P-0.3L)

E Thrd. Metric (1.0-6g 0.100R)

9 A .858

[21.80] 12

.299 [7.59]

.6250 M12

11 B .984

[25.00] 16

.427 [10.85]

.7500 M15

13 C 1.157 [29.40]

20 .541

[13.74] .875 M18

15 D 1.280 [32.50]

24 .666

[16.92] 1.000 M22

17 E 1.406 [35.70]

28 .791

[20.09] 1.1875 M25

19 F 1.516 [38.50]

32 .897

[22.78] 1.2500 M28

21 G 1.642 [41.70]

36 1.022 [25.96]

1.3750 M31

23 H 1.768 [44.90]

40 1.147 [29.13]

1.500 M34

25 J 1.890 [48.00]

44 1.272 [32.31]

1.625 M37

86

MIL

-C-3

8999

III

Documents

MIL-DTL-38999 SERIES 3 - CRIMP - milspecwest.com · MIL-DTL-38999 SERIES 3 - CRIMP 1 ... coupling system, utilizing self-locking acme thread. ... giving it a design replacement