Chicago Pneumatic Angle Die Grinder | CP3550-120 | 12000 RPM | 1/4" (6 mm) Collet

Built for controlled grinding, deburring, and finishing on accessible workpieces, the Chicago Pneumatic CP3550-120 Straight Die Grinder delivers 12,000 RPM free speed for carbide burrs, mounted points, and compatible abrasive accessories that benefit from a lower-speed, high-power grinder. Its standard straight shaft layout gives operators direct control at the work surface without the extra length of an extended-shaft model, making it well suited for bench work, fabrication stations, casting cleanup, and maintenance repair tasks. Powered by a 1.5 HP / 1100 W governed motor, this grinder helps maintain abrasive speed under load during edge breaking, chamfering, weld blending, contouring, and general metal cleanup.

The CP3550-120 uses a 15/64" / 6.0 mm collet as listed in the supplied catalog-style product data, with an Erickson Series 200 collet system for secure accessory holding. At 9.76" / 248 mm long and 2.65 lb / 1.2 kg, it is more compact than the extended-shaft CP3550-120ES when the work area is easy to reach. A rear exhaust moves air away from the work surface, while the safety lever, spindle lock button, ball governor, rotative inlet, aluminum housing, and composite over-sleeve support daily use in metalworking, industrial maintenance, and production environments.

Type: Straight Die Grinder | Model: CP3550-120 | SKU: 6151600620 | Free Speed: 12,000 RPM | Power: 1.5 HP / 1100 W | Collet Capacity: 15/64" / 6.0 mm | Collet System: Erickson Series 200 Type | Air Consumption at Load: 55 CFM / 26 l/s | Air Consumption at Free Speed: 17 CFM / 8 l/s | Air Inlet: 3/8" NPT | Working Pressure: 90 PSI / 6.3 bar | Min. Hose Diameter: 1/2" / 13 mm | Length: 9.76" / 248 mm | Height: 2.05" / 52 mm | Weight: 2.65 lb / 1.2 kg | Sound Pressure: 78 dB(A) | Sound Power: 89 dB(A) | Vibration Level: <2.5 m/s² | Exhaust: Rear | Governor Type: Ball | Main Material: Aluminum with Composite Over-Sleeve | Rotative Inlet: Yes | Spindle Lock: Yes | Starting System: Safety Lever

Features:

• 12,000 RPM free speed gives operators controlled abrasive speed for deburring, chamfering, contouring, cleaning, and finishing work.
• 1.5 HP / 1100 W governed motor helps maintain maximal abrasive speed when the burr or mounted point is loaded against the material.
• Standard straight shaft configuration provides direct handling for open work areas, benches, fixtures, and accessible part edges.
• Erickson Series 200 collet system supports secure holding of compatible shank-mounted accessories when the correct collet is installed.
• Spindle lock button allows faster carbide burr and mounted point changes to reduce downtime between grinding tasks.
• Streamlined safety lever helps reduce accidental start risk during daily shop and production use.
• Rotative inlet helps prevent hose twisting as the operator moves around fixtures, castings, and fabricated assemblies.
• Industrial-grade durability up to 1,000 hours between maintenance intervals.

Applications:

• Metal fabrication: deburring drilled holes, cleaning cut edges, chamfering parts, and blending small weld areas.
• Foundry and casting cleanup: removing flash, parting lines, and surface defects from accessible casting surfaces.
• Industrial maintenance and MRO: smoothing repair parts, cleaning machine components, and preparing brackets, guards, and mounts for fit-up.
• Machining and toolroom work: edge breaking, contouring, and finishing fixtures, molds, dies, and machined components.
• Vehicle and equipment repair: cleaning fabricated brackets, frame components, panels, and service parts in compressed-air work areas.

FAQs:

• Q: What is the CP3550-120 best used for?
  A: The CP3550-120 is used for controlled deburring, grinding, chamfering, contouring, and finishing with compatible carbide burrs and mounted abrasive accessories. Its standard straight shaft is best when the work area is open and does not require an extended-reach grinder.
• Q: How is the CP3550-120 different from the CP3550-180?
  A: The CP3550-120 runs at 12,000 RPM, while the CP3550-180 runs at 18,000 RPM. Choose the 12,000 RPM version when the accessory, material, or task benefits from lower speed and more controlled contact with the workpiece.
• Q: How is the CP3550-120 different from the CP3550-120ES?
  A: Both models run at 12,000 RPM, but the CP3550-120 has the shorter standard shaft and a 9.76" overall length. The CP3550-120ES uses an extended shaft for deeper pockets, recessed surfaces, and hard-to-reach grinding points.
• Q: What air supply does this die grinder require?
  A: Chicago Pneumatic lists 55 CFM / 26 l/s air consumption at load and 17 CFM / 8 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 grinder use any carbide burr or mounted point?
  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