Chicago Pneumatic Angle Die Grinder | CP3550-120ACC | 12000 RPM | 1/4" Collet

Built for angle-access deburring, grinding, contouring, and cleaning, the Chicago Pneumatic CP3550-120ACC angle die grinder delivers 12,000 RPM free speed for controlled work with carbide burrs, mounted points, and compatible abrasive accessories. Its 1/4" / 6.4 mm collet capacity supports common shank-mounted tooling, while the 1.48 HP / 1100 W governed pneumatic motor helps maintain abrasive speed when the accessory is loaded against welds, casting flash, drilled holes, and machined edges. The 90° angle head gives operators better access to corners, contours, recessed faces, and tight work areas where a straight die grinder may not approach the surface cleanly.

The CP3550-120ACC is a high-power angle die grinder for fabrication, foundry, production, and industrial maintenance teams that need reach, control, and sustained power in one compact tool. A ball governor helps regulate speed under load, while the spindle lock button speeds up carbide burr and mounted point changes. The rear exhaust directs air away from the work area, and the aluminum body with composite over-sleeve gives the operator a more manageable grip surface during repeated grinding, cleaning, chamfering, and finishing operations.

Type: Angle Die Grinder | Model: CP3550-120ACC | SKU: 6151604420 | Free Speed: 12,000 RPM | Power: 1.48 HP / 1100 W | Collet Capacity: 1/4" / 6.4 mm | Collet System: Erickson Series 200 Type | Angle Type: 90° | Side to Center: 1.14" / 29 mm | Air Consumption at Load: 55 CFM / 26 l/s | Air Consumption at Free Speed: 36 CFM / 17 l/s | Air Inlet: 3/8" NPT | Working Pressure: 90 PSI / 6.3 bar | Min. Hose Diameter: 1/2" / 13 mm | Length: 9.8" / 249 mm | Height: 4.06" / 103 mm | Weight: 3.31 lb / 1.5 kg | Sound Pressure: 84 dB(A) | Sound Power: 95 dB(A) | Vibration Level: 6.1 m/s² | Vibration Uncertainty K: 7.3 m/s² | Exhaust: Rear | Governor Type: Ball | Main Material: Aluminum, Composite Over-Sleeve | Rotative Inlet: Yes | Spindle Lock: Yes | Starting System: Safety Lever

Features:

• 12,000 RPM free speed supports controlled deburring, grinding, contouring, chamfering, and cleaning with compatible mounted accessories.
• 1.5 hp / 1,100 W governed motor helps maintain maximal abrasive speed during sustained contact with burrs, mounted points, and abrasive tools.
• 90° angle-head layout improves access to corners, edges, contours, recessed surfaces, and areas that are difficult to reach with a straight grinder.
• 1/4" / 6.4 mm collet capacity supports common shank-mounted carbide burrs and mounted abrasive points when the correct accessory is installed.
• Industrial grade durability up to 1,000 hours between maintenance intervals.
• Spindle lock button allows for fast carbide burr replacement to reduce tool downtime.
• Streamlined safety lever helps reduce accidental start risk during setup, handling, and daily operation.
• Rear exhaust, rotative inlet, and composite over-sleeve help improve tool handling around fixtures, workpieces, and compressed-air hoses.

Applications:

• Metal fabrication: deburring drilled holes, cleaning cut edges, chamfering parts, and blending small weld areas with angle-head access.
• Foundry and casting cleanup: removing flash, parting lines, and surface defects from casting contours and recessed profiles.
• Industrial maintenance and MRO: grinding repair parts, smoothing brackets, cleaning equipment components, and preparing surfaces for fit-up.
• Machining and toolroom work: edge breaking, contour correction, and finishing on fixtures, dies, molds, and machined parts.
• Vehicle and equipment repair: working around frames, brackets, panels, and fabricated repair components in compressed-air service areas.

FAQs:

• Q: What is the CP3550-120ACC best used for?
  A: The CP3550-120ACC is used for angle-access deburring, grinding, contouring, chamfering, and cleaning with compatible carbide burrs and mounted abrasive accessories. Its 90° head helps reach surfaces that are difficult to approach with a straight die grinder.
• Q: What collet size does this grinder use?
  A: This model is listed with a 1/4" / 6.4 mm collet capacity and an Erickson Series 200 type collet system. Match the accessory shank size to the installed collet before use.
• Q: How is the CP3550-120ACC different from the CP3550-120 straight die grinder?
  A: Both models run at 12,000 RPM and use 1.5 hp class pneumatic power, but the CP3550-120ACC has a 90° angle head for side-access grinding. The CP3550-120 uses a straight body for direct access on open work areas.
• Q: What air supply does the CP3550-120ACC require?
  A: Chicago Pneumatic lists 55 CFM / 26 l/s air consumption at load and 36 CFM / 17 l/s at free speed. Use an air system capable of maintaining 90 PSI / 6.3 bar at the tool through a minimum 1/2" / 13 mm hose.
• Q: Can this angle die grinder use any mounted point or carbide burr?
  A: No. The accessory must match the installed collet size and must have a maximum operating speed equal to or higher than the grinder's 12,000 RPM free speed. Always confirm shank size, accessory type, workpiece material, and the accessory manufacturer's safety rating before use.

Looking for more information about Chicago Pneumatic Angle Die Grinder? Click here to view the Catalog.

For help selecting the correct Chicago Pneumatic Angle Die Grinders for your assembly application, call (800) 608-5210 or email info@intlairtool.com