DYNABRADE Cone Or Plug 6" (152 mm) Extension Wheel Grinder - 52721
- 1 hp, Straight-Line, 18,000 RPM, Rear Exhaust, 3/8"-24 Spindle Thread.
- Cone or Plug Wheel Grinder, for cleaning metal, grinding and smoothing weld seams, removing imperfections before painting.
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Straight Line, 1 hp, Rear Exhaust, 6" Extension, 18,000 RPM.
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Accepts optional Abrasive Cone or Plug Wheel, 1-1/4" diameter. Governor-controlled motor maintains RPM under heavy load.
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Safety-lock lever is included on all models. Standard cushioned grip enhances operator comfort and offers additional control.
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Industrial applications in fabrication plants, welding shops, foundries, steel mills and shipyards.
Specifications
| Air Consumption (SCFM) |
40.0 |
| Power (hp) |
1.0 |
| Max. RPM |
18,000 |
| Tool Spindle Thread |
3/8"- 24 Male |
| Air Inlet Thread |
3/8" NPT |
| Exhaust Type |
Rear |
| GL_Country Of Origin |
US |
| Hose I.D. in. (mm) |
3/8" |
| Vacuum Type |
Non-Vacuum |
| Motor Type |
Rotary Vane |
| Height in. (mm) |
1.875 |
| Length in. (mm) |
14.375 |
| Weight lb. (kg) |
3.46 |
| Width in. (mm) |
5.75 |
| Pkg. Height in. (mm) |
3.25 |
| Pkg. Length in. (mm) |
16 |
| Pkg. Weight lb. (kg) |
4.41 |
| Pkg. Width in. (mm) |
5.75 |
| CE Certified |
Yes |
| EAN (UPC) |
0616026527218 |
| EAC Certified |
Yes |
| Tool Style |
Straight Line |
What our Experts Think
- The Dynabrade 52721 Cone or Plug Extension Wheel Grinder is a professional-grade pneumatic grinder built for weld preparation, metal finishing, and hard-to-reach grinding applications in industrial environments.
- Features a 6-inch extended reach shaft, allowing operators to access confined areas, deep weld seams, pipes, castings, and fabrication assemblies more effectively than standard straight grinders.
- Powered by a 1 HP air motor with governor-controlled speed, maintaining consistent performance under heavy load for smoother, more efficient material removal.
- Operates at 18,000 RPM, delivering aggressive grinding capability while remaining compatible with cone and plug wheels up to approximately 1-1/4 inches in diameter.
- Equipped with a rear exhaust design and cushioned grip, helping improve operator comfort during extended use while directing exhaust away from the work area.
- Includes a safety-lock throttle lever, an important feature for fabrication shops, foundries, shipyards, and industrial maintenance environments.
- Built for demanding professional use with a 3/8"-24 spindle thread, 40 SCFM airflow rating, and rugged industrial construction designed to withstand daily production workloads.
- Best suited for professionals who need a high-performance extended-reach grinder for precision grinding, weld cleanup, and surface preparation in difficult-access areas, rather than general-purpose workshop grinding.
Q&A
Q: What is the Dynabrade 52721 Cone or Plug Extension Wheel Grinder used for?
A: It is a professional pneumatic extension wheel grinder designed for cleaning metal, grinding weld seams, deburring, and removing surface imperfections in hard-to-reach areas.
Q: What makes the 52721 different from a standard grinder?
A: It features a 6-inch extension shaft that provides better access inside pipes, corners, fabricated assemblies, and other confined work areas.
Q: What are the key specifications?
A: The grinder features a 1 HP air motor, 18,000 RPM free speed, rear exhaust, and a 3/8"-24 spindle thread for cone and plug wheel accessories.
Q: What abrasive wheels can it use?
A: It is designed for cone and plug grinding wheels up to 1-1/4 inches in diameter, making it ideal for precision grinding and weld cleanup applications.
Q: What industries commonly use this tool?
A: It is widely used in fabrication shops, welding operations, foundries, steel mills, shipyards, and industrial maintenance environments.
Maintenance Tips
- Lubricate the air motor daily with pneumatic tool oil to reduce vane wear and maintain performance.
- Use clean, dry compressed air at the recommended 90 PSI to prevent internal corrosion and power loss.
- Inspect cone or plug wheels before use and replace any cracked, damaged, or excessively worn abrasives.
- Check the 6" extension shaft and spindle threads regularly for wear, damage, or looseness.
- Keep exhaust ports free of dust and debris to ensure proper airflow and cooling.
- Verify all fittings, hoses, and air connections are leak-free for consistent 18,000 RPM operation.
- Do not exceed the maximum rated wheel size or operating speed to prevent safety hazards.
- Inspect the safety-lock lever and throttle for smooth operation before each use.
- Store in a clean, dry environment to protect internal components from moisture and contamination.
- Periodically check vibration levels and tool balance, as excessive vibration can accelerate bearing and spindle wear.
Damage 
Loss 
Theft 
