What This Part Is and Why It Exists
The TE Connectivity 1445886-4 is a retaining pin — a mechanical secondary lock accessory for the Power Series 15/30/45 connector family. If you are building a Power Series harness and the terminals keep pushing back during mating, this is the part that fixes it.
Dimensions That Determine Fit
The pin measures 2.49/2.62 mm in diameter by 6.35 mm in length. That dual diameter means the pin has a stepped profile — the smaller end (2.49 mm) pilots into the housing latch pocket, and the larger shoulder (2.62 mm) stops it at the correct depth. The 6.35 mm overall length matches the depth of the retention slot in Power Series 15/30/45 housings. If you are cross-referencing a retaining pin from another series, the stepped diameter is the dimension to match, not just the overall length.
Compatibility: Which Housings It Fits
This pin is listed for use with Power Series 15, Power Series 30, and Power Series 45 connectors. That covers the full range of TE's rectangular power connector family — from the 15 A through 45 A rated versions. The same pin works across all three current ratings because the housing latch geometry is common across the series. If you have a Power Series 45 housing on the BOM, this pin is the correct secondary lock.