Original Makita piston 419004-5 — a precision‑machined metal piston for the percussion/impact assembly of SDS‑max rotary hammers that restores consistent blow force and smooth reciprocation.
This genuine Makita piston is a small but critical item among Makita parts used in the hammer assembly; it’s a direct, drop‑in replacement that stops loss of impact, irregular blows, and scoring caused by a worn piston.
Example fitment listings include HR4001C, HR4011C, HR4013C, DHR400 and HR4041C — use these model references to confirm compatibility with your tool.
The piston works inside a cylinder listed at about 28.5 mm and is supplied as the single metal piston component (part no. 419004-5) for the hammer mechanism.
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