MIL-C-81511 Series III, IV Circular Connectors
MIL-C-81511 series covers cylindrical, high-density bayonet connectors. Mil-Spec connectors are tested against
the rigorous conditions to which they are often exposed. M81511 connectors are manufactured to resist corrosion,
vibration, physical shock, dielectric withstanding voltage, electromagnetic interference (EMI), and more.
MIL-C-81511 includes two series:
Series III – Maximum of 155 contacts (size 22 to 12 AWG), and are available in 31 different insert arrangements.
Constructed with 100% scoop-proof rear release of contacts to minimize potential damage.
Series IV – Maximum of 85 contacts (size 22 to 12 AWG), and are available in 20 different insert arrangements.
Constructed with 50% scoop-proof rear release of contacts to minimize potential damage.
Several shell styles are available for these connectors including straight plug, square flange receptacle, single
hole mounting receptacle, cable receptacle, and more. The shell also comes in sizes from 8(A) thru 24(J) (0.850
inch to 1.814 inches).
Note: MIL-C-81511 Series I & II have been replaced by MIL-C-81511 Series III & IV.
For more information on which M81511 connector is appropriate for your application, call A.E. Petsche at 844-
237-7600 to speak with one of our qualified experts.
MIL-C-81511 Product Specifications
These connectors are in full compliance with the MIL-C-81511 specification provided by the Defense Logistics
Agency (DLA). For more details, please consult the MIL-C-81511 specification located here.
|Slant number &
shell style (Table 1)
(P = pin, S = socket)
(1, 2, 3, 4, 5, 6)
Table 1: Slant Number & Shell Style
III = Long shell series (100% scoop proof)
IV = Short shell series (50% scoop proof)
|M81511/41||III||Square flange receptacle|
|M81511/42||III||Solder mount receptacle (Class D hermetic)|
|M81511/44||III||Single hole mount receptacle (Class D hermetic)|
|M81511/45||III||Cable connecting receptacle|
|M81511/47||III||Solder mount receptacle (Class L hermetic)|
|M81511/48||III||Single hole mount receptacle (Class L hermetic)|
|M81511/49||III||Single hole mount receptacle|
|M81511/50||IV||Single hole mount receptacle (Class L hermetic)|
|M81511/51||IV||Square flange receptacle|
|M81511/52||IV||Solder mount receptacle (Class D hermetic)|
|M81511/53||IV||Single hole mount receptacle|
|M81511/54||IV||Single hole mount receptacle (Class D hermetic)|
|M81511/55||IV||Cable connecting receptacle|
|M81511/57||IV||Solder mount receptacle (Class L hermetic)|
Table 2: Class
|A||Grommet seal fluid resistant||200°C|
|F||Grommet seal fluid resistant||175°C|
|D||Hermetic solder contacts||175°C|
|L||Hermetic crimp contacts||175°C|
|W||Grommet seal fluid resistant 500 hour salt spray||175°C|
Table 3: Shell Size
*Available in Series 3 only.