DYNABRADE Cone Or Plug 6" (152 mm) Extension Wheel Grinder - 52720

DYNABRADE Cone Or Plug 6" (152 mm) Extension Wheel Grinder - 52720

•  1 hp, Straight-Line, 15,000 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.
• Straight Line, 1 hp, Rear Exhaust, 6" Extension, 15,000 RPM.
• Accepts optional Abrasive Cone or Plug Wheel, 1-1/4" diameter. Governor-controlled motor maintains RPM under heavy load.
• Safety-lock lever is included on all models. Standard cushioned grip enhances operator comfort and offers additional control.
• Industrial applications in fabrication plants, welding shops, foundries, steel mills and shipyards.

Specifications     

What our Experts Think  

• The Dynabrade 52720 Cone or Plug 6" (152 mm) Extension Wheel Grinder is a heavy-duty pneumatic straight-line grinder built for aggressive industrial metal removal and weld finishing in tight or recessed areas.
• Powered by a 1 HP governor-controlled air motor, it maintains consistent performance under load for reliable grinding and surface prep.
• Delivers high-speed operation at ~15,000 RPM, making it suitable for fast material removal and weld seam cleanup before painting or coating.
• Features a 6-inch (152 mm) extension shaft, allowing access into deep recesses, internal surfaces, and hard-to-reach fabrication areas.
• Designed for use with cone or plug wheels up to ~1-1/4" diameter, optimized for precision grinding in confined industrial spaces.
• Includes rear exhaust, safety-lock throttle lever, and cushioned grip, improving operator safety and control during continuous-duty work.
• Built for fabrication shops, welding, shipyards, steel mills, and foundries, where durability and consistent material removal matter more than finesse.
• Best suited for professionals who need a high-speed extended-reach grinder for weld cleanup, casting finishing, and industrial surface prep in confined geometries, rather than general workshop use.

 
Q&A  

Q: What is the Dynabrade 52720 Cone or Plug 6" (152 mm) Extension Wheel Grinder used for?
A: It is a heavy-duty pneumatic straight-line grinder designed for cleaning metal, grinding weld seams, removing surface imperfections, and prepping parts before painting in fabrication and industrial environments.

Q: What makes the 52720 extension design useful?
A: It has a 6-inch extended shaft, allowing operators to reach deep or hard-to-access areas like inside assemblies, corners, and recessed welds while maintaining control and grinding power. 

Q: What type of work is it best suited for?
A: It is used in welding shops, steel fabrication, shipyards, foundries, and maintenance work where fast material removal and weld cleanup are required.

 
Maintenance Tips    

• Lubricate air motor daily with pneumatic tool oil to maintain peak performance and reduce wear.
• Use clean, dry compressed air at recommended pressure to prevent corrosion and power loss.
• Inspect cone/plug wheels before each use; replace any cracked, worn, or unbalanced abrasives.
• Check 6" extension shaft and spindle for tightness, alignment, and signs of wear.
• Keep air inlet and exhaust ports free from grinding dust and debris for proper airflow.
• Ensure all fittings and hoses are leak-free to maintain consistent RPM and torque.
• Do not exceed rated abrasive speed to avoid safety risks and premature tool damage.
• Monitor vibration during operation; excessive vibration may indicate imbalance or bearing wear.
• Clean tool body after use to prevent buildup of metal dust and contaminants.
• Store in a dry, clean environment to protect internal components from moisture and corrosion.