DYNABRADE 3" (76 mm) Dia. Right Angle Diamond Cut-Off Wheel Tool - 52439
-
.4 hp, 12,000 RPM, Rear Exhaust, 3/8"-24 Spindle Thread.
- Accepts optional 3" (76 mm) diameter Diamond Cut-Off Wheels with 3/8" (10 mm) diameter center hole.
-
Ideal for cutting thick fiberglass over-wrap and fiber spray.
-
Dual-wick lubrication system saturates gears with oil for increased performance, extended life and reduced downtime (following proper maintenance procedures). Tool includes 95848 Gear Oil and 95541 Gear Oil Gun.
-
Safety-lock lever is included; rear exhaust.
Specifications Â
| Air Consumption (SCFM) |
21.0 |
| Power (hp) |
0.4 |
| Max. RPM |
12,000 |
| 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) |
1/4" |
| Vacuum Type |
Non-Vacuum |
| Motor Type |
Rotary Vane |
| Height in. (mm) |
3.125 |
| Length in. (mm) |
8.5 |
| Weight lb. (kg) |
2.19 |
| Width in. (mm) |
6.5 |
| Pkg. Height in. (mm) |
4.5 |
| Pkg. Length in. (mm) |
10 |
| Pkg. Weight lb. (kg) |
2.96 |
| Pkg. Width in. (mm) |
6.25 |
| CE Certified |
Yes |
| EAN (UPC) |
0616026524392 |
| EAC Certified |
Yes |
| Tool Style |
Right Angle |
What our Experts Think
 Â
Q&A Â
Q: What is the DYNABRADE 52439 used for?
A: A high-speed pneumatic right-angle cut-off tool designed for precise cutting of metal, fiberglass, composites, bolts, and other tough materials in fabrication and industrial environments.
Q: What makes it a âdiamond cut-off wheel toolâ?
A: It is designed to use 3" diamond cut-off wheels, which provide durability, cleaner cuts, and reduced wheel breakage compared to traditional abrasive wheels.
Q: What is the cutting capacity?
A: It uses 3" (76 mm) diameter wheels and is ideal for controlled cutting rather than deep or heavy-section cutting.
Q: What power and speed does it operate at?
A: It features a 0.4 HP air motor running at up to 12,000 RPM for fast, precise cutting performance.
Q: What materials can it cut?
A: Suitable for sheet metal, fiberglass over-wrap, fiber spray, bolts, clamps, and composite materials.
Q: Does it have a vacuum or dust collection system?
A: No, it is a non-vacuum tool, so dust is managed externally.
Q: What is the benefit of the right-angle design?
A: The 90° head improves control, visibility, and access when making straight or tight-area cuts.
Â
Maintenance Tips Â
-
Use clean, dry compressed air only: Moisture or contaminants quickly wear the vane motor and reduce cutting consistency.
-
Lubricate daily: Add a few drops of pneumatic tool oil before use to protect internal vanes and maintain smooth power delivery.
-
Maintain correct pressure (~90 PSI): Prevents overspeed beyond rated 12,000 RPM and extends both tool and wheel life.
-
Use only rated diamond cut-off wheels (3"): Ensure wheels are approved for âĽ12,000 RPM and properly matched to the 3/8"-24 spindle.
-
Inspect wheels before every use: Never use cracked, chipped, or previously dropped wheelsâfailure risk is severe at high speed.
-
Check spindle and mounting integrity: Keep threads and flanges clean and tight to avoid vibration or wobble during cutting.
-
Watch for vibration on startup: Any imbalance means stop immediatelyâdo not continue cutting.
-
Keep rear exhaust clear: Ensures cooling airflow and prevents heat buildup in continuous use.
-
Inspect air hoses and fittings: Leaks reduce torque and can cause unstable RPM under load.
-
Clean after use: Remove fiberglass, resin, and metal dust buildup from guard, spindle, and housing.
Damage 
Loss 
Theft 
