Original Bosch round clamping nut (part no. 1603345034 — Bosch catalog 1 603 345 034) designed to secure flat grinding discs on straight grinders; it’s the factory round nut used to clamp flat discs safely to the tool spindle.

Fits Bosch straight grinders in the GGS family — commonly listed for GGS 6 / GGS 6 S and GGS 8 H / GGS 8 SH Professional models.

Supplied as a single unit in Bosch packaging, this original Bosch part restores the correct disc clamping geometry and safe runout for your grinder; if you need a direct service part to fix a loose or damaged clamping nut, this is the exact Bosch power tool spare parts item for those GGS straight grinders.