cymbals
鈸 centers on a pair of metal percussion instruments: cymbals. The meaning is specific to that musical object.
鈸 combines 金 (metal) with 犮, which likely contributes the sound. The character was created to name a metal percussion instrument, cymbals.
The left side is metal 金, and the right side 犮 looks like a pair of cymbals being struck with a stick. Picture metal cymbals clashing together.
For ハツ, imagine the sharp sound of cymbals: a loud 'hats!' as they crash. The sound 'hats' cues ハツ while the metal cymbals ring.