DYNABRADE 3" (76 mm) Dia. Straight-Line Type 1 Extension Wheel Grinder - 52377
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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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3" Diameter, Straight Line, 1 hp, 6" Extension, 15,000 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) |
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 |
| Motor Type |
Rotary Vane |
| 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) |
0616026523777 |
| EAC Certified |
Yes |
| Tool Style |
Straight Line |
What our Experts Think
- The Dynabrade 58446 8" (203 mm) Two-Hand Gear-Driven Sander, Central Vacuum is a high-torque industrial finishing sander built for aggressive leveling and controlled surface prep on large panels.
- Uses a planetary gear-driven system (~900 RPM max speed) that delivers strong, consistent cutting force, making it ideal for removing filler, epoxy, coatings, and weld highs on demanding surfaces.
- The central vacuum design connects to an external dust extraction system, helping pull dust away from the air motor, improving tool life and maintaining consistent performance in heavy sanding environments.
- Equipped with an 8" hook-face pad, it provides wide surface coverage while maintaining controlled pressure, especially useful for automotive body panels and composite work.
- Runs at 900 RPM with a ~0.45 HP motor, balancing torque and control for pre-finish leveling rather than fine polishing.
- The two-hand design improves stability and reduces operator fatigue, especially during long sessions on large horizontal or vertical surfaces.
- Built with a low-vibration, rear-exhaust pneumatic body, making it suitable for continuous-duty industrial environments like fabrication shops and body repair centers.
- Best suited for professionals who need a high-power, dust-controlled sanding system for leveling, shaping, and heavy surface prep, rather than final finishing or detailing work.
Q&A
Q: What is the Dynabrade 52377 3" Straight-Line Type 1 Extension Wheel Grinder used for?
A: It is a high-speed pneumatic straight-line grinder (1 HP) designed for heavy-duty metal grinding, weld seam cleanup, deburring, and surface prep using Type 1 abrasive wheels.
Q: What does the “extension” design do?
A: The 6-inch extension shaft allows access into deep, recessed, or hard-to-reach areas, such as inside fabricated assemblies, channels, and tight weld zones.
Q: What are its key specifications?
A: It typically features a 3" wheel capacity, 15,000 RPM free speed, 1 HP motor, rear exhaust, and 3/8"-24 spindle thread, with high air consumption (~39 SCFM at 90 PSI).
Q: What materials can it be used on?
A: It is used on steel, stainless steel, cast iron, weldments, and heavy fabrication parts where fast material removal is required.
Q: Is it for finishing or rough work?
A: It is mainly for aggressive grinding and weld removal, not fine finishing or polishing.
Q: What makes it powerful compared to standard grinders?
A: The 1 HP air motor + straight-line high-speed design delivers strong, consistent cutting power under load for industrial applications.
Maintenance Tips
Damage 
Loss 
Theft 
