Original Bosch part 1610290076 — Indexing Disk: a small, precision-machined steel selector disc used in the hammer/rotary‑hammer impact assembly to control chisel indexing and ensure correct engagement of the striker and mode components.

This genuine Bosch indexing disk fits several Bosch demolition and rotary hammer models, for example GSH 5 CE and GSH 5 E demolition hammers and GBH 5‑40 DCE / GBH 5‑40 DE rotary hammers (Bosch references also show the part in exploded parts lists for service models such as 11241EVS, 11264EVS and 11316EVS).

The disk sits between the compression spring and the stop sleeve in the impact mechanism (it’s commonly listed as “indexing disc” or “index disk”), is hardened for wear resistance, and is sold under Bosch part number 1610290076 (also shown as 1 610 290 076).

If your tool’s chisel won’t hold angles or the indexing has become erratic, replacing this inexpensive, genuine Bosch indexing disk restores correct alignment and smooth mode engagement — a standard replacement found in Bosch power tool spare parts diagrams and parts lists.

Single‑piece, low‑cost item; direct-fit replacement for the models above — install when reassembling the impact unit (no machining required).