Bosch 1610210091 — genuine Bosch O‑ring (seal), 24.0 × 4.0 mm. This original Bosch sealing ring is made to the manufacturer's specification for use in Bosch demolition hammers and related heavy‑duty tools; it restores the pressure/oil seal at the tool head where worn or damaged O‑rings cause leaks or loss of hammer performance.

Key details

- Part number: 1610210091 (also shown as 1 610 210 091 / 1.610.210.091).

- Type: O‑ring / sealing ring.

- Size: 24.0 × 4.0 mm (inner diameter ≈ 24 mm, cross‑section ≈ 4 mm).

- Use: replacement seal for the damping/pressure/oil sealing locations in Bosch demolition hammers; intended to stop leaks and maintain correct internal pressure.

Example models this part is listed for (examples only — check your tool’s 7–8–9 digit type/code to confirm fit)

- Bosch GSH 5 CE / GSH 5 / GSH 5 BASIC and GSH 388.

- Bosch GSH 4 and GSH 500 series.

- Model designations and series often shown alongside Bosch service codes such as 11309EVS, 11310EVS, 11312E, 11313EVS, 11314EVS, 11318EVS, 11387 and 11388.

Quick fit/installation notes

- Confirm the tool’s type/code (the Bosch 7–8–9 digit product code stamped on the nameplate) and compare with the parts diagram for the model — this O‑ring is commonly listed as the seal identified in parts diagrams/ref no. 162 for the GSH series.

- The 24 × 4 mm O‑ring is a small, readily installed seal; replace any damaged or flattened rings and inspect mating faces for scoring before reassembly to ensure a reliable seal.

Why choose the Bosch 1610210091

- It’s the original Bosch spare part made to fit Bosch demolition hammer assemblies and restore factory sealing performance — a concise, low‑cost repair that typically cures leaks or loss of hammer action when the seal is the failing component.

(Part listings and model-compatibility references used above are from Bosch spare‑parts listings and tool parts catalogs.)

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