Power contact for 16 AWG wire
The 3-647485-1 is a tin-plated socket contact in the TE SL-156 series, terminated by crimp to 16 AWG wire.
Position in the SL-156 crimp contact family
The 3-647485-1 accepts 16 AWG wire, whereas the sibling 929989-8 accepts 17-20 AWG and ships in a box — both are tin-plated sockets with crimp termination. Another sibling, 1-1326032-0, also handles 16 AWG but carries a thinner 31.5µin (0.80µm) tin finish.