Hertel 72290570 Chucking Reamer Wire 57 0.0430 in Hss

Product Description

The HERTEL 72290570 is a wire-gauge chucking reamer designed to finish-ream holes to a precise 0.0430 inch diameter. Built from high-speed steel (HSS) with a bright, uncoated finish, it delivers consistent dimensional accuracy in ferrous and non-ferrous materials. The straight, four-flute design produces a smooth bore finish while providing efficient chip clearance. At 1.75 inches overall length with a 0.5 inch flute length, this reamer is sized for tight-tolerance work on small-diameter holes common in precision machining, toolroom, and production environments. The straight-cylindrical shank seats directly in standard drill chucks or collet holders.

This reamer is intended for machine use in drill press, mill, or lathe applications where hole size must be held to close tolerance. Wire-size reamers in the No. 57 range are commonly used in precision instrument work, jig and fixture building, and small-component production. Right-hand cutting direction is standard for conventional CNC and manual machine setups. The uncoated HSS construction suits general-purpose reaming at moderate speeds with appropriate cutting fluid.

Key Features

• Wire gauge No. 57 diameter — 0.0430 inch finished hole size
• High-speed steel (HSS) construction for hardness and wear resistance
• 4 straight flutes for smooth finish and efficient chip evacuation
• Bright uncoated finish — compatible with a wide range of cutting fluids
• Right-hand cutting direction for standard machine setups
• Straight-cylindrical shank for direct chuck or collet mounting

Compatibility

Designed as a standard chucking reamer for use in drill presses, knee mills, CNC machining centers, and lathes equipped with a drill chuck or straight-shank collet capable of accepting the straight-cylindrical shank.

Installation Notes

Chucking reamers must be run at lower RPM than twist drills — consult published HSS reamer speed-and-feed tables for the workpiece material. Always pre-drill the hole undersize, typically 0.002 to 0.005 inch under finished diameter, before reaming. Apply cutting fluid appropriate for the workpiece material to extend tool life and improve surface finish. Secure the shank fully in the chuck or collet and verify runout before cutting.