Yes, LEMO has several connector series that have optional Stainless Steel shells, PEEK inserts, and for wet environments the sealed versions have optional EPDM seals.
(Note: EDPM seals are standard on the N Series).
Yes. The LEMO N Series Connector was designed specifically for robotics use in telemanipulator applications.
In addition, LEMO has several models in LEMO B Series, S Series, K Series, and E Series connectors, which are also suitable.