This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
鈵 combines 金 (metal) with 丙, which likely contributes the sound. The exact historical development is uncertain.
With 金 (metal) on the left and 丙 on the right, 鈵 suggests a type of metal object, but its specific meaning is unclear.
For ヘイ, imagine a heavy metal object: heavy -> ヘイ, and the metal radical 金 reinforces the image.