Hertel 72401979 Taper Pin Reamer Size 4/0 Hss

Product Description

The HERTEL 72401979 is a taper pin reamer designed for precision hole enlarging, finishing, and shaping in metalworking applications. Built from high-speed steel with a bright/uncoated finish, this reamer is sized for a 4/0 taper pin, with a small end diameter of 0.0869 inches and a large end diameter of 0.1142 inches. The spiral flute geometry with right-hand cutting direction promotes smooth chip evacuation and accurate sizing. At 2.3125 inches overall length with a 1.3125-inch flute length and a 0.125-inch square shank, it fits standard machine tool holders used in drill press, lathe, and milling setups.

This taper pin reamer is suited for general-purpose machine shop and maintenance work where taper pin holes must be reamed to a precise fit before pin installation. Common applications include aligning and securing mechanical assemblies such as shaft collars, gears, and linkages. The 4/0 size is appropriate for small-diameter taper pin applications in both production and repair environments. Machinists and tool-and-die technicians working in light manufacturing, maintenance, and repair operations are the primary users of this tool.

Key Features

• High-speed steel construction for general-purpose cutting performance across a range of metals
• 4/0 taper pin size with a 1:48 taper rate for precise pin hole geometry
• 4 spiral flutes with right-hand cut for smooth chip removal and accurate sizing
• Bright/uncoated finish maintains dimensional accuracy out of the box
• Square shank provides positive drive engagement in standard tool holders
• Compact 2.3125-inch overall length suited for confined or close-tolerance work

Compatibility

Designed as a standard taper pin reamer for size 4/0 taper pin holes, compatible with square-shank tool holders accepting a 0.125-inch shank diameter.

Installation Notes

Taper pin reamers are typically installed and operated by machinists using a drill press, lathe, or hand brace with appropriate square-shank holders. Always secure the workpiece firmly before reaming and apply a suitable cutting fluid to extend tool life and improve finish quality. Power down and de-energize any associated machinery before inspecting or replacing the reamer. Do not exceed the recommended feed rate for the workpiece material, as forcing the tool can damage the flutes or distort the tapered bore.