DYNABRADE 3" (76 mm) Dia. Straight-Line Type 1 Extension Wheel Grinder - 52378
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1 hp, 18,000 RPM, Rear Exhaust, 3/8"-24 Spindle Thread.
- Type 1 Wheel Grinder, for cleaning metal, grinding and smoothing weld seams, removing imperfections before painting.
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3" Diameter, Straight Line, 1 hp, 6" Extension, 18,000 RPM.
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Accepts optional 3" diameter Type 1 Wheel, with 3/8" center hole (maximum wheel width of 1/2"). Governor-controlled motor maintains RPM under heavy load; rear exhaust.
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Safety-lock lever is included on all models.
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Standard cushioned grip enhances operator comfort and control.
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 |
| Height in. (mm) |
3.5 |
| Length in. (mm) |
11.25 |
| Weight lb. (kg) |
4.41 |
| Width in. (mm) |
4.75 |
| Pkg. Height in. (mm) |
3 |
| Pkg. Length in. (mm) |
19.25 |
| Pkg. Weight lb. (kg) |
5.29 |
| Pkg. Width in. (mm) |
4.75 |
| CE Certified |
Yes |
| EAN (UPC) |
0616026523784 |
| EAC Certified |
Yes |
| Tool Style |
Straight Line |
What our Experts Think
Q&A
Q: What is the DYNABRADE 52378 used for?
A: A high-speed pneumatic straight-line Type 1 wheel grinder designed for aggressive metal removal, weld seam cleanup, deburring, and surface preparation before finishing or coating.
Q: What type of work is it best for?
A: It is commonly used in fabrication, welding, and industrial maintenance for smoothing welds, removing casting imperfections, and cleaning metal surfaces.
Q: What makes the extension design useful?
A: The 6-inch extension allows access into recessed areas, pipes, and tight spaces where standard grinders cannot reach.
Q: How powerful is it?
A: It uses a 1 HP pneumatic motor designed for continuous heavy-duty industrial grinding.
Q: What is the operating speed?
A: It runs at up to 18,000 RPM, enabling fast material removal and efficient surface preparation.
Q: What type of wheels does it use?
A: It is designed for Type 1 reinforced grinding wheels (3" diameter), typically with a 3/8" center hole.
Q: Is it suitable for precision finishing?
A: No. It is an aggressive grinding tool meant for rough shaping and cleanup, not fine finishing.
Maintenance Tips
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Use clean, dry compressed air only: Moisture or debris rapidly wears the vane motor and reduces RPM stability.
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Lubricate daily: Add a few drops of pneumatic tool oil before use to keep internal vanes smooth and extend motor life.
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Maintain correct air pressure (~90 PSI): Prevents overspeed beyond rated 18,000 RPM and protects both tool and wheel.
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Match wheel RPM rating: Only use Type 1 wheels rated ≥18,000 RPM to avoid catastrophic wheel failure at high speed.
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Inspect wheels before every use: Never use cracked, chipped, or dropped wheels—imbalance at this speed is dangerous.
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Check spindle and 3/8"-24 threads: Keep mounting surfaces clean and tight to avoid vibration and wobble.
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Watch for vibration on startup: Run briefly at low throttle after wheel installation; stop immediately if imbalance is felt.
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Keep rear exhaust clear: Ensures proper cooling and stable motor airflow during continuous grinding.
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Inspect air hoses and fittings: Air leaks reduce torque and can cause inconsistent RPM under load.
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Clean after each use: Remove grinding dust from spindle, guard area, and housing to prevent buildup and imbalance.
Damage 
Loss 
Theft 
