MDM-21SSL is a Micro-D metal shell connector featuring 21 contacts with 0.050" (1.27 mm) contact spacing and size 24 MICROPIN/MICROSOCKET contacts. The connector employs an aluminum shell to provide greater strength, prevent chipping and cracking, and offer electromagnetic (EMI) and radio frequency interference (RFI) shielding. It incorporates a silicone elastomer compression interfacial seal to provide moisture and humidity sealing between each contact. The connector meets rigorous environmental and performance standards, including dielectric withstanding voltage of 600 VAC at sea level, insulation resistance of 5,000 megohms minimum, and contact resistance of 8 milliohms maximum at 3 amps. These highly reliable, lightweight connectors are designed for applications requiring small size, high contact density, and rugged performance in demanding environments such as aerospace, military, and industrial systems.