The A850492117N04B is a straight, non-environmental backshell from the M85049/21 series, designed to provide effective cable holding and strain relief for MIL-DTL-38999 Series III & IV circular connectors. This backshell is constructed from durable aluminum alloy with a conductive electroless nickel finish. It corresponds to accessory shell size 17 and features a spin coupling nut for easy installation. With a clamp size of 04, it accommodates a cable diameter range from 0.31 to 0.50 inches and has a maximum length of 3.53 inches (Length Code B). As a non-environmental backshell, it offers a cost-effective solution suitable for inside-the-box or climate-controlled applications where environmental sealing is not a concern but robust strain relief is essential.