Makita 9557NB 4-1/2\" Angle Grinder Teal | 7.5A, 11,000 RPM, AC/DC Ready

Powerful, precise grinding for metalworking and prep

The Makita 9557NB is a compact 4-1/2-inch angle grinder designed to tackle demanding metalworking tasks in both shop and job-site environments. With a 7.5-amp motor, it delivers up to 11,000 no-load RPM, providing swift material removal while preserving control in tight spaces. At 120V and a weight of 4.5 pounds, this grinder pairs robust capability with a portable balance that reduces user fatigue during longer sessions.

Designed to endure tough conditions, this model blends durable construction with practical features that support versatile use across projects—from rust removal to edge shaping and surface preparation.

Smart design features that matter

• All-ball-bearing design and a metal gear housing for solid, long-lasting performance.
• Labyrinth construction seals the drive gear and bearings from dust and debris, helping maintain smooth operation over time.
• Protective varnish on the armature shields critical components from dust and moisture.
• Rotatable gear housing can be positioned every 90 degrees, enabling grinding or cutting at multiple angles.
• AC/DC switch provides versatility for use with alternative power sources when needed.
• Thicker coil wires are wound closer to the armature to help manage heat and energy loss during heavy use.

Operational comfort is central to the design. The tool features a compact 2-1/2" diameter barrel grip and an extra-large paddle switch for easy operation. A spindle lock supports quick wheel changes, and the side handle can be mounted on either side to suit user preference and task direction.

Real-world uses and practical benefits

• Metal fabrication and rust removal on beams, rails, and frames with confident control.
• Surface preparation prior to coating or welding, including deburring and smoothing welds.
• Edge grinding and material shaping in tight spaces thanks to a balanced, low-fatigue design.

In addition to its power, this grinder ships with a complete kit that supports immediate setup and safe operation. The 4-1/2" grinding wheel, wheel guard, lock nut, lock nut wrench, side handle, and inner flange are ready to use out of the box.

Quick reference specs

• No-load speed: 11,000 RPM
• Spindle thread: 5/8" x 11 UNC
• Length: 10-5/8"
• Weight: 4.5 lbs

Whether you are upgrading a workshop or outfitting a jobsite, the Makita 9557NB offers a compelling balance of power, durability, and versatility. Consider it for tasks that demand steady performance with flexible power options and user-friendly features. Results depend on technique and material, but the design supports consistent, controlled grinding and prep when used with proper safety practices.

What's included

• 4-1/2" grinding wheel
• Wheel guard
• Lock nut
• Lock nut wrench
• Side handle
• Inner flange