MICRO SWITCH™ High Temperature Hermetically Sealed Limit Switches: HR Series, Double Pole Double Throw (DPDT), 5 A 28 Vdc, 3/4-20 UNEF Thread Bushing with Corrosion Resistant Steel Pin Plunger, Switch will Withstand Temperature of 315 °C [599 °F], Pan Head Screw Termination with Integral Washers, Military Part Number MS24594-1