The 66925-509LF: The 0.115" (2.92mm) post length is standard for a 1.6mm PCB with a through-hole solder joint.
The housing is black glass-filled nylon (PA), rated UL94 V-0 — the highest common flammability class for enclosures that must self-extinguish within 10 seconds. An insulation plug is included in the tube package, which protects the contacts during handling and prevents solder wicking up the socket.