Original Makita 231985-1 — Ring Spring (d43). This genuine Makita ring spring (often listed as “Ring Spring 43” / d43) is a precision-formed retaining/return spring made from hardened spring steel to maintain correct preload and rebound in demolition-hammer impact mechanisms.

Designed as a direct-fit replacement for select Makita demolition hammers (models such as HM1214C, HR5001C and compatible HK/HM series models), it restores consistent striking performance and helps prevent accelerated wear of adjacent components when a fatigued or broken spring is replaced.

Part number 231985-1 is the original Makita component number and is supplied as a single ring spring sized and formed for reliable seating inside the impact assembly — simple to fit with standard workshop tools as part of routine maintenance or repair.