Cleveland C25512 Chucking Reamer 0.2495 in Hss

Product Description

The CLEVELAND C25512 is a straight-flute chucking reamer machined from high-speed steel (HSS) and designed to bring bored or drilled holes to a precise final diameter. With a cutting diameter of 0.2495 inches, a 6-flute straight-flute geometry, and a bright uncoated finish, this reamer is suited for finishing operations where tight dimensional tolerances are required. The straight shank allows direct chucking in drill presses, lathes, and machining centers. It carries a dowel pin reamer designation with a tolerance of 0.0000 to -0.0020 inches, making it appropriate for press-fit and slip-fit dowel pin holes in tool and die, fixture, and general machining work.

This reamer is used in machine shop environments for finishing through-holes and blind holes to a controlled diameter in steel, cast iron, aluminum, and similar machinable materials. The 0.2495-inch diameter targets the nominal 1/4-inch dowel pin size and is classified as a dowel pin reamer, making it a common choice in fixture building, mold making, and precision assembly applications where hole location and fit are critical. It is typically run in a rigid setup at controlled spindle speeds with appropriate cutting fluid to achieve optimal finish and tool life.

Key Features

• Cutting diameter of 0.2495 inches with dowel pin tolerance of 0.0000 to -0.0020 inches for precise fit-up
• 6-flute straight-flute geometry for smooth cutting action and consistent surface finish
• High-speed steel construction provides toughness and resistance to wear in general machining applications
• Straight shank for direct chucking in standard drill chucks, collets, or machine tool spindles
• Bright uncoated finish suitable for use with cutting oils and water-soluble coolants
• Overall length of 6 inches with a 1.5-inch flute length for reach in standard workpiece setups

Compatibility

Designed as a dowel pin reamer for finishing 0.2495-inch diameter holes in machine shop and toolroom applications requiring controlled fit tolerances.

Installation Notes

Chucking reamers should be installed by a qualified machinist in a rigid machine setup — drill press, lathe, or CNC machining center. Secure the straight shank firmly in the chuck or collet before operation and verify runout before cutting. Always apply an appropriate cutting fluid for the workpiece material to extend tool life and improve hole finish. Pre-drill or bore the hole to within 0.005 to 0.015 inches of final diameter before reaming; do not use a reamer to remove excessive stock.