Cleveland C25946 Chucking Reamer 0.437 in Hss Straight Flute

Product Description

The CLEVELAND C25946 is a straight-flute chucking reamer designed for precision hole finishing in metalworking applications. Built from high-speed steel (HSS) with a bright, uncoated finish, this reamer delivers accurate sizing for dowel pin fits, holding a tight tolerance of 0.0000 to -0.0020 inches. It measures 0.437 inches in diameter with a 7-inch overall length and a 1-3/4-inch flute length. The 6-flute, right-hand-cut design provides smooth, controlled material removal and is suited for use in drill presses, lathes, and CNC machining centers where chuck-driven reaming is required.

This chucking reamer is used in machine shop and production environments where final bore sizing must meet close-tolerance specifications. Its straight shank allows direct clamping in standard drill chucks or collets without an adapter. The dowel pin reamer designation means it is specifically ground to match standard dowel pin diameters, making it a common choice when assembling jigs, fixtures, or precision-fit mechanical assemblies. It is appropriate for both job shop and production floor use across general metalworking, toolmaking, and maintenance machining.

Key Features

• Straight flute geometry for clean, low-chatter cuts in through-holes
• High-speed steel construction provides good wear resistance across a range of ferrous and non-ferrous materials
• 6-flute design improves surface finish and sizing accuracy compared to lower flute counts
• Bright, uncoated finish — no coating to chip or affect tolerance buildup
• Dowel pin reamer ground to 0.437 inches with tolerance of 0.0000 to -0.0020 inches for precise press or slip fits
• Straight shank compatible with standard drill chucks and collets

Compatibility

Designed as a standard chucking reamer for use in drill presses, lathes, and machining centers equipped with a drill chuck or collet system accepting a straight shank.

Installation Notes

Chucking reamers are installed and operated by machinists familiar with machine tool setup and cutting tool selection. Before mounting, ensure the machine spindle and chuck are fully stopped and locked. Secure the straight shank firmly in a chuck or collet to prevent runout, which will directly affect hole size and finish. Always use appropriate cutting fluid for the workpiece material and feed at a controlled rate — do not force-feed a reamer, as this will damage the cutting edges and oversize the bore.