Original Bosch 1610210109 — O‑ring, 26.0 x 4.0 mm — a genuine Bosch replacement seal precisely sized to match the original part number 1 610 210 109.

This circular sealing ring measures 26.0 mm (ID) with a 4.0 mm cross‑section and is supplied as the exact Bosch power tool parts item used in several professional rotary hammers.

Fits examples: Bosch GBH 7‑46 DE series and related GBH heavy‑duty rotary hammers (check the type number on your tool to confirm fit — the part is shown in the GBH 7‑46 DE parts diagram).

Use this original Bosch O‑ring to restore proper sealing around internal valves/shafts and stop oil or grease leaks that can cause loss of performance; a small, inexpensive replacement that extends the service life of your tool. This item is a common power tool parts replacement for Bosch rotary hammers and is easy to install during routine repair.

Browse our full range of Bosch hammer drill parts.