The TE Connectivity 2-1991253-5 is a hinged backshell for 25-position D-sub connectors, designed to terminate round cable with a 180° straight exit. It accepts standard 25-position D-sub shells and also fits high-density 44-position shells that share the same B shell size. The polyamide (nylon) body is black, and the package is bulk. The backshell includes the 4-40 mating screws and a cable clamp as part of the assembly hardware, so you don't need to source those separately.
What's Included — Hardware and Fit
The 4-40 mating screws are included with the backshell, answering the common question of whether you need to order them separately. The assembly hardware also includes a cable clamp for strain relief on round cable. The hinged design allows the backshell to open for cable termination and then close over the connector, securing the cable exit at 180°. The backshell is unshielded, so it's suited for applications where EMI/RFI shielding is handled elsewhere in the cable assembly or where the environment doesn't require a shielded backshell.