MIL-DTL-38999/62
Application notes.
(These application notes contain information of a general or explanatory nature and are provided for
information only.)
The sealing boot is primarily designed for use with a shielded size 8, wired contact in connector
applications. The sealing boot may also be used with a size 8 dummy contact.
Sealing boot installation. Sealing boots are installed onto the cable first, and then the contact is
crimped to the cable. The contact is then inserted into the connector's size 8 grommet cavity until it
locks into position. The contact/sealing boot assembly is then press fit into the size 8 grommet
cavity.
Use of accessories and mitigation of contact splaying. Recommend that methods to prevent
contact splaying be considered during new design. The wire harness design must keep the twinax
or coax pin in axial alignment. Depending on the insert arrangement and the wiring harness design,
the maximum protrusion of the sealing boot from the rear of the grommet may potentially interfere
with a straight backshell with saddle bars installed onto the rear of the connector. Both sealing boot
styles are designed for use with an SAE-AS85049/38 strain relief backshell. A 90 degree backshell
should be avoided. Note: SAE-AS85049/147, which is a straight, extended backshell developed for
use with MIL-DTL-38999 connectors that require sealing boots, does not have any qualified
manufacturing source at the time of publication of this document, but should be considered when
sources become available. Commercially available wire supports, also called wire "combs",
"spiders" or "wire support bushings", are also potential design options for mitigating contact splaying.
More design precautions/recommendations are referenced in MIL-HDBK-1760, which refers to the
splaying problem with the keyword "skewing".
Recommended grommet cavity dimensions. Figure 2 is not mandatory, but is provided as guidance.
FIGURE 2. s ecommended grommet cavity dimensions, sealing boot,
R
ize 8, shielded crimp contacts, configuration.
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