Genuine Bosch O‑ring (part number 1600210034, also listed as 1 600 210 034) engineered as the replacement sealing/retaining ring used in a range of Bosch grinders, polishers and similar handheld tools.

Precision size: 4.0 × 1.0 mm (cross‑section 1.0 mm, nominal diameter 4.0 mm), single‑piece rubber O‑ring supplied as one unit — ideal when a small seal or pin‑retaining ring has worn, cracked or fallen off.

Common fitment examples reported for this part include Bosch angle grinders and related tools such as GWS 14‑180, GWS 6‑115, GWS 7‑115, GWS 8‑115, GWS 18‑230, GWS 23‑230 and models in the GPO/GNS series (for example GPO 9‑180, GPO 12, GNS 14); it’s also shown for portable polishers/other models like GWS 2200 P and older grinder references such as 1752. Confirm against your tool’s exploded parts diagram, but these are typical applications.

Why choose this part: it restores the original sealing/retention geometry so shafts, pins and covers sit securely and rotate correctly — a small, inexpensive part that prevents larger service issues. Supplied as the single genuine Bosch replacement O‑ring (1600210034).

If your tool shows lubricant leakage around a pin, loose locking parts, or a missing small seal in the gearbox/guard area, this is the exact Bosch numbered O‑ring used in the models listed above.

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