I fly from SFO with United Airlines arriving in Beijing at 4:25pm and connecting to Hong Kong

Do you use the same airlines for all the trips? Do the airlines arrange the flights and transit timing? If the answers are yes for the two questions, you will catch your plane, because I heard the least transit duration in th terminal shall be 60min.

Howver, if you will use differet airlines, especially in different terminals, time will be very tight. It is best to change another plane!