What This Header Is
The 87901-156HLF: Contact finish is gold or Gold GXT at 30.0 µin (0.76 µm) on the mating interface — a thick gold grade that governs both low contact resistance at first mate and reliable performance across repeated push-pull insertions without a locking clip. The header is unshrouded and unkeyed, so pin-one orientation on the mating half is the installer's responsibility on any ribbon or cable interconnect.
Board-Level Fit
The 0.100-inch insulation height (0.820-inch post engagement length) defines how deeply the header seats into a receptacle or IDC transition. Confirm that the mating half's slot depth accommodates the 20.83 mm post insertion length — a shallow housing can bottom out before the header is fully seated.