What This 4-Position VAL-U-LOK Housing Is
The 1586019-4: It uses a 0.165" (4.20mm) pitch and a latch lock fastening system that gives an audible click when fully mated — useful in assemblies where vibration could back out a friction-only connector. This is the housing only — the crimp sockets (female contacts) are ordered separately. That means you select the wire gauge and plating (tin or gold) that matches your current draw and environment, then crimp them onto the leads before inserting into the housing.
What Fits in This Housing — Contacts and Mating Half
The 1586019-4 accepts TE VAL-U-LOK female crimp terminals (socket contacts). The exact terminal part number depends on your wire size — typically 18-22 AWG for the standard VAL-U-LOK contact range. The mating plug is the male VAL-U-LOK header or plug housing with the same 4.20mm pitch and latch-compatible profile. On the harness side, you'll need the correct hand crimp tool or a semi-automatic press with the VAL-U-LOK applicator. Because the contacts are field-installable, you can re-pin a damaged housing on site with a basic crimper and a terminal extraction tool — no need to scrap the whole harness. That's the practical advantage of a crimp-and-poke system over a molded-overmold assembly.