ZDG-301L500 – 21-3/8-Inch Air Extension Die Grinder
The ZDG-301L500 Air Extension Die Grinder is a professional-grade, long-reach air die grinder engineered for high-speed grinding and polishing in hard-to-access or recessed areas. Built with an aluminum alloy extension shaft and ergonomic design, this grinder excels in delivering precision and productivity in demanding industrial environments.
Specifications
| Feature | Specification |
|---|---|
| Motor Power | 1.0 HP |
| Free Speed | 22,000 RPM |
| Collet Options | ¼″ (6 mm) and 3/8″ (8 mm) double-angle collet holders |
| Length | 21-3/8 in (~543 mm) extension shaft |
| Net Weight | 3.9 lbs (~1.8 kg) |
| Air Inlet | ¼″ NPT |
| Minimum Hose Size | ⅜″ (10 mm) |
| Air Consumption | ~4.2 CFM |
| Exhaust | Rear exhaust for cleaner operation |
| Grip & Safety | Comfort grip over-housing with streamlined safety lever |
| Construction | Robust aluminum alloy structure |
Advantages & Benefits
Extended Reach with Precision
The 21-3/8-inch shaft allows you to access deep or confined areas—perfect for detailed work inside engine bays, molds, or machinery interiors.High-Speed Efficiency
Operating at 22,000 RPM, this model delivers fast and smooth grinding with strong efficiency, maintaining control even in extended setups.Versatile Accessory Compatibility
Supports both 6 mm and 8 mm collets, offering flexibility to use a variety of grinding disks, burrs, or finishing tools.Ergonomic and Safe Design
The comfort grip and streamlined safety lever improve operator control and reduce fatigue during prolonged usage.Cleaner Work Environment
Rear exhaust design enhances user comfort by directing airflow—and any debris—away from hands and surfaces.
Common Applications
Best suited for:
Automotive Maintenance – Accessing deep-seated components, such as rotors, internal body panels, or backing plates.
Mold & Die Work – Precision finishing in internal cavities or molds without requiring tool disassembly.
Industrial Fabrication – Reaching into machinery assemblies or structural components where standard grinders can’t reach.
Quick Model Comparison
| Model | RPM | Length | Weight | Ideal For |
|---|---|---|---|---|
| ZDG-301L500 | 22,000 RPM | 21-3/8″ | 3.9 lbs | High-speed precision in deep workspaces |
| ZDG-3076L500 | 3,500 RPM | 21-3/8″ | 4.5 lbs | Higher torque, low-speed grinding needs |
Why Choose the ZDG-301L500?
If your work involves precision finishing in hard-to-reach areas, the ZDG-301L500 delivers exceptional speed, control, and ergonomics in one tool. Its design is tailored for professional applications where accuracy and access are critical—making it a trustworthy choice for serious industrial tasks.
Benefits
- Industrial extended shaft long die grinder design for high-speed grinding& polishing in hard-to-reach areas
- By using 1/4″( 6mm) or 3/8″(8mm) Double Angle Collets, the die grinder can be used in a wide range of grinding and polishing applications with various wheels
- 4000rpm models are excellent for grinding applications with a flap sanding wheel
- High productivity
- Highest durability in demanding applications
Features
- 12″ (305 mm), 21-3/8″ (543 mm), 31-1/2″ (800 mm) extended body by Aluminum alloy structure.
- Comfort grip over-housing
- Streamlined safety lever
- Rear exhaust
- 1/4″ (6mm) & 3/8″ (8mm) industrial grade Double Angle collet holder
- 1.0 hp motor
- 22,000 rpm free speed models and 3,500 rpm free speed models
 | |
| ZST-200E-29 6mm COLLET ZST-200E-29-1 1/4″ COLLET | ZST-200E-29-2 8mm COLLET ZST-200E-29-4 3/8″ COLLET |
Specification:
- 1HP Die Grinders
- Collet size: 1/4(6) inch(mm)
- Net Weight: 3.9(1.8) Ibs(kg)
- Length: 27(688) inch(mm)
- rpm: 22000
- Air Inlet: 1/4 inch
- Min.Hose Size: 3/8(10) inch(mm)
- Avg. Air Cons.: 4.2 cfm
* The length of the extended body can be customized to extend as required.
| Model | Collet size inch(mm) | Net Weight lbs(kgs) | Length inch(mm) | rpm | Air Inlet inch | MinchHose Size inch(mm) | Avg. Air Cons. cfm |
| ZDG-301L300 | 1/4(6) | 2.9(1.3) | 17.5(445) | 22000 | 1/4 | 3/8(10) | 4.2 |
| ZDG-301L500 | 1/4(6) | 3.9(1.8) | 27(688) | 22000 | 1/4 | 3/8(10) | 4.2 |
| ZDG-301L800 | 1/4(6) | 4.9(2.2) | 37.1(943) | 22000 | 1/4 | 3/8(10) | 4.2 |
| ZDG-3076L300 | 1/4(6) | 3.5(1.6) | 18.7(477) | 3500 | 1/4 | 3/8(10) | 4.2 |
| ZDG-3076L500 | 1/4(6) | 4.5(2) | 28.3(719) | 3500 | 1/4 | 3/8(10) | 4.2 |
| ZDG-3076L800 | 1/4(6) | 5.5(2.5) | 38.3(974) | 3500 | 1/4 | 3/8(10) | 4.2 |
