DYNABRADE 4" (102 mm) Dia. Straight-Line Type 1 Extension Wheel Grinder - 52380
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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.
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4" Diameter, Straight Line, 1 hp, 6" Extension, 15,000 RPM.
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Accepts optional 4" diameter Type 1 Wheel, with 3/8" center hole (maximum wheel width of 1/4").
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Governor-controlled motor maintains RPM under heavy load; rear exhaust. Safety-lock lever is included on all models.
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Standard cushioned grip enhances operator comfort and allows additional control.
Specifications
| Air Consumption (SCFM) |
39.0 |
| Power (hp) |
1.0 |
| Max. RPM |
15,000 |
| 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) |
4.5 |
| Length in. (mm) |
11.25 |
| Weight lb. (kg) |
4.41 |
| Width in. (mm) |
9.5 |
| Pkg. Height in. (mm) |
4.5 |
| Pkg. Length in. (mm) |
14.5 |
| Pkg. Weight lb. (kg) |
5.95 |
| Pkg. Width in. (mm) |
9.5 |
| CE Certified |
Yes |
| EAN (UPC) |
0616026523807 |
| EAC Certified |
Yes |
| Tool Style |
Straight Line |
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.
Damage 
Loss 
Theft 
