Park Tool HMR-4 Hammer

Description

Park Tool HMR-4 Hammer is a professional-grade addition to any collection of bike tools, designed for controlled striking during bicycle service and general workshop tasks. This versatile shop hammer from Park Tool USA is ideal for mechanics working on bottom brackets, headset parts, star-fangled nuts, and other components that require precise force.

• Official Park Tool item number: HMR-4, also sold as a 21 oz. shop hammer.
• Fits professional and home workshop use for bicycle repair, assembly, and component service.
• Commonly used with bearing, headset, and bottom bracket service procedures where a balanced striking tool is needed.
• Includes a replaceable non-marring nylon face; replacement tip part number: #293.
• Known by shoppers searching hand tools Park Tool HMR- hammer replacement or Park Tool USA Park Tool HMR- hammer.

The HMR-4 features a precision-machined forged-steel striking face paired with a non-marring nylon mallet head for added versatility. Overall weight is approximately 31 oz. with a 21 oz. head, and the hammer measures 13.5 inches long for a stable, well-balanced feel in the hand. The steel face measures 35 mm (1.38 inches) in diameter, while the nylon face measures 43 mm (1.69 inches). A fiberglass shaft with a soft-touch grip helps reduce fatigue and improves control. This is an original Park Tool product rather than a generic aftermarket substitute, and installation of the replacement nylon tip is simple for most DIY users.

OEM-quality Park Tool construction with easy workshop usability and dependable same-day shipping from our warehouse.