AS50151 is a specification that covers connectors with both military and commercial applications. These connectors are rated for operation within a temperature range of -55 °C (-67 °F) to either 125 °C (257 °F), 175 °C (347 °F), or 200 °C (392 °F) depending upon the class. The upper temperature is the maximum internal hot spot temperature resulting from any combination of electrical load and ambient conditions. The various classes and types of connectors are intended for application as follows:
a. AS31001, AS34001, AS34501, and AS34001 are receptacles intended for wall or bulkhead mounting and for use with conduit or cable clamp.
b. AS31011, AS34011, and AS34511 are receptacles intended for use at the end of a cable where mounting provisions are not required.
c. AS31021, AS34021, and AS34521 are receptacles intended for mounting on shielding boxes and equipment cases. They have no fittings and are for use with open wiring. They are non-environmental and are intended for use on boxes where environmental seal is achieved by some other means.
d. AS34041, AS34121, and AS34541 are receptacles intended for wall or bulkhead mounting and for use with conduit or a cable clamp.
e. AS31061, AS34061, AS34091, and AS34561 are plugs intended for use at the end of a cable to be mated with a receptacle. AS34091 is a 45-degree plug intended for use at the end of a cable where space does not permit the use of a straight plug.
f. AS35071 is a plug intended for use at the end of a cable which may require rapid disconnect from a receptacle.
g. AS31081 and AS34081 are 90-degree plugs intended for use at the end of a cable where space does not permit the use of a straight plug.
h. AS31031 is a receptacle intended for use in applications where a potted seal around wires is required.
i. AS25183 is a plug intended for use in applications where a potted seal around wires is required.
j. AS34591 is a plug with a self-locking coupling nut which is designed for firewall applications.
k. All classes of the series I are either canceled or inactive for new design. For the status of specific classes, refer to applicable AS sheets.
l. Class A connectors are solid shell connectors are intended for non-environmental applications.
m. Class B connectors are split shell connectors intended for non-environmental applications. The split shell provides greater accessibility to solder connections, as may be needed if the cable is contained in conduit.
n. Class C receptacles are intended for use on the walls and bulkheads of pressurized compartments and on the cases of pressurized equipment. They will limit air leakage to the amount specified by 3.9.1, regardless of the type and class of plug mated with them.
o. Class D, DT, DY, and DZ connectors are intended for use where the connectors will be subjected to high-impact shock conditions beyond the capabilities of the other class connectors. These connectors have crimp contacts which are released from the front of the connector and a wire sealing range capable of sealing on naval shipboard cable. These connectors also have a specified shell conductivity.
p. Class E connectors are inactive for new design.
q. Class D, DT, DSN, DV, DY, DZ, F, L, P, R, U, W, X, WT, WY, and WZ connectors are intended for use where the connector will be subject to heavy condensation and rapid changes in temperature or pressure, and where the connector is subject to high vibratory conditions. To ensure proper performance, a class D, DT, DSN, DV, DY, DZ, F, L, P, R, U, W, X, WT, WY, or WZ connector plug must always be mated to a class D, DT, DSN, DV, DY, DZ, F, L, P, R, U, W, X, WT, WY or WZ receptacle respectively. A type AS31021 (F and R), AS34021 (D, DT, DSN, DV, DY, DZ, L, U, W, X, WT, WY, and WZ) AS34121 (D, DT, DSN, DV, DY, DZ, L, U, W, X, WT, WY, and WZ) AS34021 (D, DT, DSN, DV, DY, DZ, L, U, W, X, WT, WY, and WZ), or AS34121 (D, DT, DSN, DV, DY, DZ, L, U, W, X, WT, WY, and WZ) receptacle does not provide moisture or vibration protection at its back end, and a type AS31001 (F and R), AS34001 (D, DT, DSN, DV, DY, DZ, L, U, W, X, WT, WY, and WZ), or AS34001 (D, DT, DSN, DV, DY, DZ, L, U, W, X, WT, WY, and WZ) should be used if such protection is desired. Class F and R receptacles are intended for use on the walls and bulkheads of pressurized compartments and on the cases of pressurized equipment. They limit air leakage to the amount specified in 3.9.1 regardless of the type and class of plug mated to them. Potting form for class P connectors should remain with the connector after potting.
r. Class H receptacles are intended for use on hermetically sealed devices and their performance requirements are determined by the particular application. They should maintain the degree of seal required by the equipment specification and for mating with plugs conforming to the requirements of this specification.
s. Class K connectors are intended for use where it is necessary to maintain electrical continuity for a limited time even though the connector is subjected to continuous flame. To ensure such continuity, both receptacle and mated plug must be class K, and high-temperature wires must be used. If flame integrity only is desired, without the need for electrical continuity, a class K receptacle must be used but the mated plug may be of any type and class.
t. Class L connectors are intended for use where the connector will be subjected to elevated temperature 175 °C (347 °F) and where complete fluid resistance is required. These connectors have crimp contacts and are available in both front (AS34XX) and rear (AS345X) release retention systems. These connectors have specified shell conductivity.
u. Class U connectors are intended for use where the connector will be subject to heavy condensation and rapid changes in temperature or pressure, and where the connector is subject to high vibratory conditions and elevated temperature 200 °C (392 °F). These connectors have crimp contacts and are available in both front (AS34XX) and rear (AS345X) release retention systems. In addition, these connectors provide complete fluid resistance.
v. Class W, WT, WY, and WZ connectors are intended for general use where complete fluid resistance is required. These connectors have crimp contacts and are available in both front (AS34XX) and rear (AS345X) release retention systems.
w. Crimp contact connectors should have contacts installed in all positions when the connector is wired. Sealing plugs should be installed in the grommet holes when no wire is attached to the contact in grommet sealed connectors.
x. Counterpart solder and crimp contact connectors are intended to be intermateable. Moisture resistance capability is then reduced to that of the solder contact connectors.
y. If air leakage requirements are critical, a resilient insert receptacle or class H receptacle should be used, or the connector should be potted.
z. Restrictions on the hexavalent chromates: Classes A, B, C, D, DS, DJ, DJS, E, F, K, KT, P, R, W, and X use hexavalent chromium conversion coating and may not be suitable for military applications with restrictions on hexavalent chromium. In the event of restrictions on hexavalent chromates, then Classes DV, DT, WT, DSN, DY, DZ, H, HS, HT, KS, L, LS, U, and WZ may be suitable. Note: For tin-zinc Class DV, AMS2343 "grade A" (hexavalent chromium) is allowed, since only grade A chromates are available with non-reflective colors. However, 4.6.26 specifies verification testing to ensure that the finish is virtually free of hexavalent chromium (see 3.33).
For new design, U.S. Navy shipboard applications should use connectors with SnZn (Class DV) connector finish. The use of cadmium plating is restricted in U.S. Navy shipboard applications.
Wire Sizes to Be Used with Contacts
It is intended that size 6 wire should be crimped or soldered to a size 4 contact because no size 6 contacts are provided and size 4 is the next larger. Except for class K connectors, satisfactory performance of connectors will be obtained if wire sizes are governed by Table 8. For wire diameters less than specified in Table 8, shrink-fit sleeving should be used over the wire. Where two or more wires are used in a solder cup, moisture sealing is not obtainable. Wires should be potted if seal is required. Electrically conductive bushings as provided for in AS39029/112 should be used in crimping sizes 10, 6, and 2 wire in contact sizes 8, 4, and 0, respectively. Only one conductor should be used in crimp removable contacts.
Working Voltage
The maximum recommended sea level working voltage is shown in Table 24.
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