The TE Connectivity 5747100-1 is a two-piece backshell from the AMPLIMITE HD-20 series, designed to fit D-subminiature connectors with shell size C — that covers both standard 37-position and high-density 62-position connectors. It is a shielded, plastic-body backshell with a straight 180° cable exit for round cable, and it ships with the assembly hardware and strain relief included. The nickel over copper plating on the shell provides a continuous EMI shield path when the backshell is grounded through the D-sub connector's shell, which is the standard method for passing radiated emissions testing in industrial control cabinets and telecom equipment.
What the 4-40 Screws and Strain Relief Mean for the Build
The 5747100-1 comes with mating screws in the standard 4-40 thread — the same thread as the jack-screws on a standard D-sub connector. That means you do not need a separate hardware kit; the screws are in the bag. The included strain relief clamps onto the round cable jacket, transferring pull force from the cable to the backshell rather than to the crimp terminals inside the D-sub. On a 37-position harness with 20-24 AWG wires, that strain relief is what keeps the terminations from pulling loose during installation or maintenance.
How It Compares to 7-1437064-0
The 7-1437064-0 is the same AMPLIMITE HD-20 backshell in the same 37-position, 180° exit configuration, but packaged in a tube instead of bulk. For a harness shop that feeds backshells into a kitting station, the tube packaging may be easier to handle than loose bulk parts. The functional fit — shell size C, 4-40 screws, strain relief, shielded — is identical between the two. The choice between them is a packaging preference, not a design decision.