M2 Series – Glass-Sealed Connectors Our M2 Series Plugstats come with a variety of MIL-STD glass-sealed connectors. Some of our more popular designs are shown below.Please contact us with your specific MIL connector requirements. M2001 – Bimetal Thermal Switch, Close-on-Rise, 1/2-20UNF-3A thread / Glass-Sealed Connector M2002 – Bimetal Thermal Switch, Close-on-Fall, 1/2-20UNF-3A thread / Glass-Sealed Connector M2101 – Bimetal Thermal Switch, Open-on-Fall, 1/2-20UNF-3A thread / Glass-Sealed Connector M2102 – Bimetal Thermal Switch, Open-on-Rise, 1/2-20UNF-3A thread / Glass-Sealed Connector