Original Bosch armature (rotor) with integrated cooling fan — part number 1614010252 — a direct replacement for the motor rotor assembly.

Designed for 220–240 V operation, the laminated armature stack measures about 40 mm in diameter with a stack length near 39.5 mm, and includes the fan vane set for correct cooling and airflow.

Direct-fit for the GBH 4-32 DFR / GBH 4 DFR (10 digit code such as 3611C32100, 3611C32101, 3611C32130 and many others are listed as compatible) — useful when servicing Bosch power tool parts in that series.

If your hammer’s rotor shows burned windings, heavy sparking at the commutator, or damaged fan blades, swapping in this original Bosch rotor restores correct shaft alignment, cooling and motor performance so the tool runs smoothly again.

Browse our full range of Bosch hammer drill parts.