Genuine Bosch snap/retaining ring, part number 1604601028 (also shown as 1 604 601 028). This is a round‑wire external snap ring (DIN 7993, form A) sized for the A22 nominal groove — nominal outer diameter ≈ 22 mm, inner diameter ≈ 19.7 mm, wire thickness ≈ 2.0 mm — made from spring steel to lock shafts and components securely in rotary/hammer mechanisms.
Engineered to the original Bosch specification, it’s the exact retaining ring used in a range of Bosch hammer and rotary‑hammer assemblies (examples: GBH 2‑26 / 11255VSR, GBH 2‑28 / GBH‑2‑28 series, GBH 36 V‑LI, GBH 18V‑26 / GBH18V series, PBH 2900 RE and similar models listed in Bosch power tool parts diagrams).- Check your 10 digit version number from off the side of the machine to confirm fit before purchasing.
Small, simple and ready to drop into the groove where the original ring sat — it restores correct axial retention of gears/shafts and prevents slippage or disassembly during use. Supplied as the single genuine Bosch replacement part you need to return the tool to factory fit.
If you need the exact specification for machining or verifying a groove, the DIN 7993 A22 table shows the standard groove/diameter values (outer ≈ 22 mm, bore/shaft ~19.7 mm, cross‑section ~2.0 mm).
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