Dotco 12R0400-43 Inline Precision Grinder | 12-04 Series | 0.1 HP | 60,000 RPM | 3 mm Collet | Composite Housing | Rear Exhaust

Built for precise deburring, fine edge cleanup, and small-area metal removal, the Dotco 12R0400-43 Inline Precision Grinder delivers 0.1 HP with a fast 60,000 RPM free speed for miniature carbide burrs and diamond pins. Its 3 mm collet accepts compatible metric-shank accessories, giving toolroom, mold, and precision manufacturing users a compact grinder for detailed work where a standard die grinder may be too large or difficult to control.

Part of the Dotco 12-04 Series, this pencil-style grinder combines a lightweight composite housing, rear exhaust, and roll throttle for close-up finishing tasks. The short collet guard configuration helps improve access around small features, while the 4 ft overhose keeps exhaust routing away from the operator’s hand and the immediate grinding area during careful bench or production work.

Type: Inline Precision Grinder | Series: 12-04 Series | SKU: 12R0400-43 | Power: 0.1 HP / 0.074 kW | Free Speed: 60,000 RPM | Collet Size: 3 mm | Tool Configuration: Inline | Tool Termination: Collet | Housing: Composite | Exhaust: Rear | Collet Guard: Short | Overhose: 4 ft / 1.2 m | Abrasive Capacity: 1/4" Carbide Burr, 1/4" Diamond Pin | Overall Length: 5.8" / 147 mm | Tool Weight: 0.220 lb | Air Inlet: 1/8" NPT

Features:

• Industrial bearing construction supports dependable spindle performance during precision deburring and fine metal removal.
• 60,000 RPM free speed helps small rotary accessories cut efficiently when matched to the correct material and speed rating.
• 3 mm collet accepts compatible metric-shank burrs, pins, and small material-removal accessories.
• Short collet guard improves access around tight features, small cavities, and detailed workpiece geometry.
• Compact and lightweight composite housing supports controlled pencil-style handling during detailed finishing operations.
• Rear exhaust directs spent air away from the front of the tool to help reduce chip disturbance near the work surface.
• Roll throttle allows fingertip speed control while maintaining an inline grip for close-tolerance work.

Made in USA:

Applications:

• Mold and die maintenance: Cleaning small cavities, breaking sharp edges, and refining tooling details with compatible carbide burrs or diamond pins.
• Precision machining departments: Removing burrs from drilled holes, milled edges, and small machined features after production operations.
• Aerospace and component manufacturing: Performing controlled detail finishing on small parts where grinder size and accessory control are important.
• Automotive and motorsport fabrication: Touch-up grinding on ports, brackets, custom metal parts, and hard-to-reach edges.
• Maintenance and repair benches: Cleaning replacement parts, fixtures, jigs, and shop-made components before installation or assembly.

FAQs:

• Q: What accessory shank size does the Dotco 12R0400-43 use?
  A: This model uses a 3 mm collet, so it should be paired with compatible 3 mm shank accessories. Always confirm both shank size and maximum RPM rating before installing an accessory.
• Q: What is the difference between this model and other 12-04 Series pencil grinders?
  A: The 12R0400-43 is a 60,000 RPM inline precision grinder with a 3 mm collet, rear exhaust, short collet guard, and 4 ft overhose. Other 12-04 Series models may differ by collet size, guard configuration, or hose arrangement.
• Q: Why does the short collet guard matter?
  A: A short collet guard can improve access when working around small cavities, narrow edges, or detailed part features. It helps position the accessory closer to the work area while still using the guard configuration specified for this model.
• Q: Can this grinder replace a standard die grinder?
  A: No. This is a precision pencil grinder for fine deburring and controlled detail work. Standard die grinders are typically larger tools used for broader material removal with different accessory sizes.
• Q: What air supply should be used with this grinder?
  A: Use clean, dry, regulated air and follow the manufacturer’s operating pressure recommendations. For turbine-style precision grinders, avoid adding lubrication unless the manufacturer instructions for the specific tool state otherwise.

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Need help selecting the correct Dotco Grinders for your application? Please call (800) 608-5210 or email info@intlairtool.com