Key B coding prevents accidental mating with a Key A receptacle, useful when multiple similar connectors sit in the same harness bundle.
Pitch, Positions, and Keying — The Fit Check
At 2.00 mm pitch and 9 positions, this plug matches the standard Grace Inertia 2.0 receptacle footprint. Key B means the plug only mates with a Key B receptacle — if your existing harness uses Key A, this won't cross without changing the mating half. The black housing colour is consistent across the series, so visual identification in a multi-connector assembly relies on the keying, not the shell colour.
Field Service Reality — Can You Re-Pin It On Site?
Yes — this is a field-repairable connector. No soldering, no special tooling beyond the crimp tool for the contact gauge. If a terminal backs out in the field, you can re-pin it on site with a basic kit — no need to swap the whole harness.