Bosch 1610210187 — genuine Bosch O‑ring / sealing ring for rotary hammers. Carefully sized to restore the piston/striker sealing on affected Bosch hammers, this original Bosch ring is listed under Bosch part number 1 610 210 187.

Key details: circular sealing ring for rotary-hammer assemblies with an approximate outer diameter of 21 mm and a cross‑section of about 3.0–3.2 mm (sized to match Bosch factory grooves).

Example Bosch models this ring is used on (fits where the same part number is specified): GBH 2‑24 and GBH 18V‑26, GBH 2‑25 series, and larger models such as GBH 36 V‑LI / GBH 2‑26 variants.Cross reference with the 10 digit product code from side of the machine to confirm fit.

Why pick this part: it’s the original Bosch sealing ring designed to seat in the factory groove, helping stop dust and lubrication loss so the hammer mechanism operates smoothly again. Simple replacement if the old ring is cracked, flattened or missing — install in the same groove and check for correct seating before reassembly.

Browse our full range of Bosch hammer drill parts.