HD10 Connectors TE Connectivity / DEUTSCH HD10 connectors are an environmentally sealed, thermoplastic, and cylindrical connector series. With arrangements from 3 to 9 cavities, HD10 connectors accept size 4, 12, or 16 contacts and are available either in-line or flanged. The HD10 series is heavily used for diagnostic connectors, eliminates problems associated with assembly and maintenance time, and is designed for long service life.