Makita Belt Sander 3X21
Overview
The Makita Belt Sander 3X21 (9903) is designed for fast and efficient stock removal across woodworking, carpentry, flooring, deck building, and general contracting applications. Powered by an 8.8 AMP motor with electronic speed control, the 9903 delivers consistent performance across a variable speed range of 690 to 1,440 ft/min, making it a versatile corded belt sander for demanding job-site use.
Technical Specifications
| Manufacturer Part Number (MPN) | 9903 |
|---|---|
| Brand | Makita |
| Tool Weight | 9.9 lb |
| Shipping Weight | 11.8 lb |
| Overall Length | 11-5/8 in. |
| Belt Width | 3 in. |
| Belt Length | 21 in. |
| Motor | 8.8 Amps |
| Speed Range | 690 – 1,440 ft/min (variable) |
| Noise Level | 84 dB |
| Power Source | Corded |
| Cord Length | 16.4 ft. |
| Dust Collection | Yes |
| Variable Speed | Yes |
| Warranty | 1 Year |
Technical Features
- 8.8 AMP Motor with Electronic Speed Control: Maintains constant speed under load, ensuring consistent material removal without bogging down during demanding passes.
- Variable Speed Dial (690–1,440 ft/min): Allows the operator to match belt speed precisely to the material and application, reducing the risk of surface damage on sensitive stock.
- Low Noise Operation at 84 dB: Rated as one of the quietest sanders in its class, reducing operator fatigue and improving communication on shared job sites.
- 3 x 21 in. Belt Capacity: Wide belt contact area enables high-volume stock removal across broad surfaces such as decking, flooring panels, and furniture components.
- Integrated Dust Collection: Captures sanding debris at the source, helping maintain a cleaner work environment and extending abrasive belt life.
- 16.4 ft. Cord Length: Extended reach reduces the need for additional extension cords in many job-site scenarios.
Applications
- Woodworking and furniture making — controlled variable speed protects finished and semi-finished surfaces
- Carpentry and general contracting — high belt speed enables rapid stock removal on framing and trim components
- Floor installation — wide belt footprint and consistent motor speed suit large, flat surface preparation
- Deck building — handles pressure-treated and rough-sawn lumber efficiently across extended work sessions
California Proposition 65 Warning: Dust created by power sanding may contain chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm. Always work in a well-ventilated area with approved respiratory protection. For more information, visit www.P65Warnings.ca.gov.














