Genuine Bosch 1610210176 — O‑ring, black rubber sealing ring sized 9.0 x 3.5 mm (nominal 9.0 mm diameter with 3.5 mm cross‑section). It’s the small sealing gasket used in rotary‑hammer assemblies to restore proper piston/locking seals and stop air or grease leaks.

Compatible with a number of Bosch rotary‑hammer and percussion models, for example GBH 2‑24 / GBH 240 series, TBH 260 (type references around 3611B7xxxx), and model 11255VSR — check your tool’s parts diagram or type plate to confirm fit.

Made from durable elastomer to withstand the heat and pressure inside the tool’s piston/valve area, sold as the original Bosch replacement part 1610210176. A small, inexpensive part that quickly restores sealing performance so your hammer drills and percussion functions run as intended — one of the Bosch power tool parts that keeps the pneumatic system working reliably.

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