Hertel 72296064 Chucking Reamer 0.1240 in Hss 4 Flute

Product Description

The HERTEL 72296064 is a chucking reamer designed to finish-size drilled or bored holes to a precise 0.1240-inch diameter. Manufactured from high-speed steel (HSS), it delivers the hardness and wear resistance needed for production and maintenance machining in metal. The right-hand spiral flute geometry improves chip evacuation and reduces chatter compared to straight-flute designs. With an overall length of 2.75 inches and a flute length of 0.875 inches, this is a compact tool suited for close-quarter work in drill presses, lathes, and CNC machining centers. Machinists and toolroom technicians install this reamer when hole tolerance and surface finish requirements exceed what a twist drill alone can achieve.

This reamer is used in general metalworking, maintenance, and toolroom applications where a 0.1240-inch finish bore is required. The straight-cylindrical shank allows direct chucking in standard drill chucks or collets without an adapter. It is classified as an over/under size reamer, making it appropriate for achieving specific fits within the 0.1000 to 0.1499-inch diameter range. Typical install scenarios include final sizing of pin holes, dowel bores, and precision clearance holes in ferrous and non-ferrous materials.

Key Features

• 0.1240-inch finished bore diameter for precision hole sizing
• HSS construction for hardness and wear resistance in metalworking applications
• Right-hand spiral flute design promotes efficient chip evacuation and reduces chatter
• 4-flute configuration balances material removal with surface finish quality
• Straight-cylindrical shank for direct mounting in standard drill chucks or collets
• Compact 2.75-inch overall length suits confined machining setups

Compatibility

Designed as a standard chucking reamer for use in drill presses, lathes, and machining centers equipped with a chuck or collet sized to accept a straight-cylindrical shank tool in the 0.1240-inch diameter class.

Installation Notes

Installation is performed by machining professionals in toolroom, production, or maintenance environments. Secure the shank fully in the chuck or collet before operation and verify runout with an indicator when tolerance is critical. Apply cutting fluid appropriate for the workpiece material to extend tool life and improve surface finish. Never force a reamer into an undersized pilot hole; the pilot bore should be drilled close to final size before reaming.