The 557-107M1-06B is a Mil-Spec circular connector manufactured by Glenair. It is an environmentally sealed, threaded, panel mounted, 4-pin connector. This connector has a size 16 shell and accepts 4 standard 23 AWG contacts. It has a stainless steel coupling nut, knurled aluminum shell, and a sealing ring. The contact termination type is solder. This connector is designed for use in applications such as aircraft, aerospace, and military use. It is designed to meet Mil-Specs such as MIL-C-26482 and MIL-STD-202F and is RoHS Compliant.