172118 is an RF connector panel receptacle designed for high-frequency applications. It features a 5/8-24 UNEF-2B thread specification with brass material (BBD1) and teflon dielectric components (NSLA12R), providing reliable RF performance and mechanical durability. The connector has a nominal outer diameter of 21.00 mm (0.827 inches) and a length of 30.40 mm (1.198 inches), with mounting holes of 3.20 mm diameter (4 positions) spaced 18.24 mm apart. This panel-mount receptacle is commonly used in RF and microwave systems where secure mechanical connection and consistent electrical performance are required.