MIL-PRF-31031B
1.1.3 Environmental seal. The connector is designated as sealed or unsealed in the following manner.
See space grade packaging requirements for space grade connectors (see section 5.1).
N-
Unsealed.
B-
Unsealed, space grade.
S-
Sealed.
G-
Sealed, space grade.
Y-
Hermetic.
H-
Hermetic, space grade.
1.2 Categories. The categories of connectors are designated by an A (field serviceable), B (non-field
replaceable, special tools may be required), C (field replaceable, solder center contact), D (field
replaceable, crimp center contact), E (field replaceable), F (field replaceable) and M (field replaceable) as
follows:
a. Category A - Connectors which do not require special tools to assemble are designated as
category A connectors. Standard wrenches, soldering equipment, pliers, etc., are not defined as
special tools. Intended for use on flexible cables only.
b. Category B - Connectors which require special tools to assemble are designated category B
connectors. These connectors are for original equipment manufacturers use only. A qualified
source for the replacement connector in another category must be in existence before connectors
from this category can be used by the OEM. Loss of the qualified source for the replacement
connector will force the removal of the associated category B part from the QPL as well. Category
B connectors will not be stocked or procured by the Government.
c. Category C - Connectors which require only standard military crimping tools for braid attachment
and standard cable stripping dimensions to assemble are designated as category C connectors.
The standard military crimping tool is as specified in 3.1. Center contacts are assembled by
solder. (Intended for use on flexible cables only).
d. Category D - Connectors which require only standard military crimp tools for the center contact
and outer ferrule, and standard cable stripping dimensions to assemble are designated as
category D connectors. The standard military crimp tools are as specified in 3.1. Intended for
use on flexible cables only.
e. Category E - Connectors using semirigid cables with standard stripping dimensions and using
standard soldering tools.
f. Category F - Connectors using semirigid cables with standard stripping dimensions and using
standard military tools. The method of assembly of the connector to the cable is crimping for at
least the outer conductor. Center contacts may be soldered.
g. Category M - Connectors using semirigid cables with standard stripping dimensions using
standard military tools. The method of assembly is mechanical and does not require the use of
crimping tools or soldering irons.
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