Alvord Polk 21821 Chucking Reamer 0.2158 in Hss Threaded Shank

Product Description

The ALVORD POLK 21821 is a straight-flute chucking reamer designed for precision hole finishing in metal fabrication and machining applications. Built from high speed steel (HSS) with a bright polished finish, this reamer delivers accurate, repeatable results in production and toolroom environments. It features a threaded shank for positive chuck engagement and cuts in a right-hand direction. The reamer diameter is 0.2158 inches (5.48 mm) with a tight tolerance of plus 0.0002 inches, making it suitable for close-tolerance bore work where fit and finish matter. Licensed machinists and tool-and-die technicians are the primary users of this tool.

This chucking reamer is suited for light to medium-duty reaming operations on ferrous and non-ferrous metals. The 1-1/2 inch flute length provides adequate chip clearance for through-holes and shallow blind holes in typical machining setups. The 2-3/8 inch overall length fits standard drill press chucks, CNC machining centers, and manual lathes. It is appropriate for job shops, maintenance facilities, and production machining environments requiring consistent hole sizing in the 0.2000 to 0.2499 inch diameter range.

Key Features

• High speed steel construction for durability across a range of workpiece materials
• Bright polished (uncoated) finish reduces friction and aids chip evacuation
• 6-flute straight configuration for smooth, consistent surface finish in the bore
• Threaded shank ensures positive retention in compatible chucks
• Right-hand cutting direction for standard machine spindle use
• Tight diameter tolerance of plus 0.0002 inches for close-fit hole finishing

Compatibility

Designed as a standard chucking reamer for use in drill presses, manual lathes, and CNC machining centers equipped with a compatible threaded-shank chuck or collet system accepting a 0.2000 inch pilot diameter.

Installation Notes

Installation and use should be performed by a qualified machinist or tool operator. Power down and lock out the machine spindle before mounting or removing the reamer. Ensure the threaded shank is fully seated and secured in the chuck before beginning the cut. Use appropriate cutting fluid for the workpiece material to extend tool life and maintain bore quality.