Original Bosch sealing O‑ring — part no. 3600210003. This is a small, precision O‑ring listed for Bosch corded drill/hand‑tool assemblies with an inner diameter of 15.6 mm and a cross‑section (thickness) of about 1.8 mm.

What it is and why it matters: a genuine Bosch sealing ring that replaces the factory seal in the tool’s parts diagram — a simple, exact replacement when the old ring is cracked, hardened or leaking. It’s the same sized seal shown in Bosch spare‑parts diagrams for several PSB series percussion drills.

Example model fitment (examples from Bosch power tool parts lists): DBH 740 R (Type : 0 607 557 501) , PSB 1000-2 RCA ( Type 3 603 A72 800) , PSB 700-2 RE (Type : 0 603 162 963) , PSB 800-2 RA ( Type : 3 603 A72 700) and PSB 1000-2 RCE (Type : 3 603 A72-840). These are common locations where the 15.6 × 1.8 mm O‑ring is used.

Quick notes for installation: replace with the same Bosch part number to ensure correct fit and sealing; inspect the groove and mating surfaces for burrs or debris before seating the new ring.

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