Astro Pneumatic 1221 Composite Body, 1/4 Inch, 90° Die Grinder + Mini Die Grinder Kit
- The Astro Pneumatic 1221 kit includes a composite-body 1/4 inch 90° angle die grinder (front exhaust), a mini die grinder, and an 8 piece double cut carbide rotary burr set ideal for precision metal grinding and shaping in tight and general access areas.
- Features:
- Composite bodies reduce vibration and lower operator fatigue.
- 90° angle grinder (front exhaust) offers access in confined spaces.
- Mini die grinder features lever throttle and built-in regulator for precise speed control.
- 8-piece rotary burr set (1/4-inch shank) covers common shapes: cylindrical, radius end, ball, tree shapes.
- Includes:
- 1/4" 90° angle die grinder (front exhaust)
- 1/4" mini die grinder with safety lever
- SA-5 cylindrical burr 1/2" x 1"
- SA-3 cylindrical burr 3/8" x 3/4"
- SC-3 cylindrical radius end burr 3/8" x 3/4"
- SC-1 cylindrical radius end burr 1/4" x 5/8"
- SD-1 ball burr 1/4"
- SD-3 ball burr 3/8"
- SF-3 tree radius end burr 3/8" x 3/4"
- SF-5 tree radius end burr 1/2" x 1"
- Specifications:
- Manufacturer: Astro Pneumatic
- Part Number: 1221
- Collet Size: 1/4 inch (for both grinders)
- Angle Grinder Free Speed: 20,000 rpm
- Mini Grinder Free Speed: 25,000 rpm
- Air Inlet Thread: 1/4 inch NPT
- Air Hose I.D. Size: 3/8 inch
- Average Air Consumption: 3 cfm per tool
- Operating Air Pressure: 90-120 psi
- System Compatibility: suitable for die grinding and shaping metal surfaces in both tight and open areas, replacing multiple separate tools
- The Astro Pneumatic 1221 can also be referred to as 1221 die grinder combo, composite body grinder kit 1221, 1221 burr set kit, 1/4 inch grinder combo, and Astro 1221 burr & grinder set.
Astro Pneumatic manufactures professional air tools and shop equipment, including the ONYX series of compact impact wrenches engineered for high torque and accessibility in cramped applications.
Q: What burr shapes and sizes does the included set cover?
A: The set includes eight double cut carbide burrs on 1/4-inch shanks: SA-5, SA-3, SC-3, SC-1, SD-1, SD-3, SF-3, SF-5 with cylindrical, radius, ball, and tree-shape variants.
Q: What are the speed ratings of the grinders?
A: The 90° angle grinder runs at 20,000 rpm, while the mini inline grinder is rated at 25,000 rpm.
Q: Are both grinders air powered, and what air specs are required?
A: Yes, both are pneumatic. They require 90-120 psi air pressure and roughly 3 cfm air consumption with 1/4 inch NPT inlet and 3/8 inch minimum hose size.
