Original Bosch 1903230013 — a hardened steel ball (DIN 5401), 7 mm diameter, made to the tolerances used in Bosch rotary-hammer assemblies.
This genuine Bosch replacement ball is used inside the hammer/impact mechanism of Bosch rotary hammers and fits a range of models, including GBH 36 V‑LI, GBH 200, GBH 18 V‑LI, GBH 18 V‑EC and PBH 2100 RE (listed fitment examples).
Sold as part number 1903230013 (also shown as 1 903 230 013), it’s a simple, precision component you swap into the impact assembly to restore smooth contact and reliable operation — a small but critical item in power tool parts maintenance.
Browse our full range of Bosch hammer drill parts.
