Park Tool

Steel Bottom Bracket Tool BBT-147-12

Park Tool Steel Bottom Bracket Tool BBT-147-12 is a heavy-duty, precision-machined shop tool for removing and installing select 12-notch threaded bottom bracket and lockring-style components. Built from tough 4140 steel with an extra-deep body and low-profile engagement walls, it’s designed to reach recessed lockrings and clear extra-wide spindles for more secure, slip-resistant service.

• Precision-machined 4140 steel - Durable, high-strength construction for repeated bottom bracket removal/installation without rounding tool engagement
• 12-notch compatibility - Fits 12-notch threaded bottom bracket tool fittings with 50–53mm major diameter (outside of notches) and 48.2mm minor diameter (inside of notches)
• Extra-deep body - Accommodates extra-wide spindles for improved fit and clearance during service
• Low-profile engagement walls - Seats properly on recessed lockrings to help reduce slip and tool damage
• Multiple drive options - Use a 3/8" drive fitting, 1" hex fitting, or 36mm wrench flats to match available shop tools and torque needs