Value Collection SM1500021 Chucking Reamer 21/64 in Cobalt

Product Description

The VALUE COLLECTION SM1500021 is a straight-shank chucking reamer designed to finish-ream drilled holes to a precise 21/64 inch (0.3281 inch decimal) diameter. Constructed from cobalt steel, it handles harder workpiece materials and elevated cutting temperatures better than standard high-speed steel tooling. The 6-flute, right-hand spiral configuration promotes smooth chip evacuation and a consistent surface finish. With a 6 inch overall length and a 1-1/2 inch flute length, this reamer is suited for bench drilling, radial drill press, and CNC work where accurate hole sizing is critical. It ships uncoated in a bright finish. Machinists, toolroom technicians, and maintenance mechanics are the primary users.

This reamer is used in metalworking operations where drilled holes require final sizing to close tolerances. It fits straight-cylindrical chuck holders on drill presses, lathes, and CNC machining centers. Typical applications include sizing holes for dowel pins, bearings, and precision-fit fasteners in ferrous and non-ferrous materials. The cobalt steel construction makes it particularly well suited for stainless steel, cast iron, and other abrasion-resistant alloys that would rapidly wear standard HSS reamers.

Key Features

• Cobalt steel construction resists heat and wear on hard or abrasive materials
• 6-flute right-hand spiral design for smooth chip flow and accurate finish
• 0.3281 inch (21/64 inch) finished-hole diameter for precise sizing
• Straight-cylindrical shank fits standard drill chucks and collet holders without adapters
• Bright, uncoated finish — no coating buildup risk in tight-tolerance applications
• 6 inch OAL with 1-1/2 inch flute length suits standard depth-of-cut requirements

Compatibility

Designed as a general-purpose chucking reamer for use in any straight-cylindrical chuck or collet holder sized to accept the shank diameter, on drill presses, engine lathes, turret lathes, and CNC machining centers.

Installation Notes

Chucking reamers should be installed by a qualified machinist or toolroom technician. Secure the straight-cylindrical shank firmly in a drill chuck or collet before operation and verify runout with a dial indicator when tolerances are tight. Always apply cutting fluid appropriate to the workpiece material to extend tool life and improve surface finish. Pre-drill the hole to within 0.005 to 0.015 inch of finished size before reaming — do not use a chucking reamer to remove excess stock.