Yes, HINGES is a Scrabble word!

Letter values in Scrabble US: H 4, I 1, N 1, G 2, E 1, S 1.

Is it a valid word?

HINGES is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

a joint that holds two parts together so that one can swing relative to the other
a circumstance upon which subsequent events depend

Also: flexible joint.