DYNABRADE 4" (102 mm) Dia. Straight-Line Type 1 Extension Wheel Grinder - 52380

DYNABRADE 4" (102 mm) Dia. Straight-Line Type 1 Extension Wheel Grinder - 52380

•  1 hp, 15,000 RPM, Rear Exhaust, 3/8"-24 Spindle Thread.
• Type 1 Wheel Grinder, for cleaning metal, grinding and smoothing weld seams, removing imperfections before painting.
• 4" Diameter, Straight Line, 1 hp, 6" Extension, 15,000 RPM.
• Accepts optional 4" diameter Type 1 Wheel, with 3/8" center hole (maximum wheel width of 1/4").
• Governor-controlled motor maintains RPM under heavy load; rear exhaust. Safety-lock lever is included on all models.
• Standard cushioned grip enhances operator comfort and allows additional control.

Specifications   

What our Experts Think    

• The Dynabrade 52380 4" (102 mm) Straight-Line Type 1 Extension Wheel Grinder is a high-speed industrial pneumatic grinder designed for aggressive metal removal, weld cleanup, and internal surface finishing.
• Powered by a 1 HP governor-controlled air motor, it maintains stable RPM under load for consistent cutting performance in demanding fabrication environments.
• Delivers ~15,000 RPM operating speed, making it suitable for fast material removal using Type 1 abrasive wheels on steel and structural metals.
• Features a 4" (102 mm) Type 1 wheel capacity with 3/8"-24 spindle thread, optimized for controlled grinding and weld seam blending before painting or coating.
• Includes a 6-inch extension shaft design, allowing access into recessed, internal, or hard-to-reach fabrication areas where standard grinders cannot reach effectively.
• Built with rear exhaust, safety-lock throttle, and cushioned straight-line handle, improving operator control, comfort, and durability during continuous-duty use.
• Designed for industrial applications such as fabrication shops, shipyards, steel structures, and heavy maintenance work—not light finishing or general-purpose grinding.
• Best suited for professionals who need a high-torque extended-reach wheel grinder for weld smoothing, casting cleanup, and internal metalwork in confined spaces, where precision access and sustained power matter more than surface refinement.

Q&A    

Q: What is the Dynabrade 52380 4" Straight-Line Type 1 Extension Wheel Grinder used for?
A: It is a high-speed pneumatic grinder designed for heavy-duty metal removal, weld cleanup, deburring, and surface preparation using Type 1 abrasive wheels.

Q: What makes the extension design useful?
A: It has a 6-inch extension shaft that allows access into deep, narrow, or hard-to-reach areas like inside frames, channels, and recessed welds.

Q: What are its key specifications?
A: It features a 1 HP air motor, 4" wheel capacity, 15,000 RPM speed, 3/8"-24 spindle thread, and rear exhaust design, delivering strong industrial grinding power.

Q: What materials is it used on?
A: It is commonly used on steel, stainless steel, cast iron, and welded fabrication parts for aggressive stock removal and cleanup.

Q: Is it for finishing or rough work?
A: It is primarily for rough grinding and weld removal, not fine finishing or polishing.

Q: What industries use it?
A: It is used in fabrication shops, shipyards, steel mills, foundries, and heavy industrial maintenance environments.

Maintenance Tips    

• Lubricate air motor daily with pneumatic tool oil to maintain smooth high-speed operation.
• Use clean, dry compressed air at recommended PSI to prevent corrosion and internal wear.
• Inspect 4" Type 1 grinding wheels before use; replace any cracked, chipped, or unbalanced wheels immediately.
• Check extension shaft, spindle, and wheel mounting for tightness and proper alignment.
• Keep air inlet and exhaust ports clear of grinding dust to ensure proper airflow and cooling.
• Ensure hoses and fittings are leak-free to maintain consistent RPM and grinding performance.
• Do not exceed rated wheel speed to avoid wheel failure and safety hazards.
• Monitor vibration during operation; excessive vibration may indicate imbalance or worn bearings.
• Clean tool body after each use to remove metal dust and debris buildup.
• Store in a dry, clean environment to protect internal air motor and components from moisture and corrosion.