Hertel K011024AS Straight Flute Tap 5-40 Unc Hss

Product Description

The HERTEL K011024AS is a straight flute plug tap designed for cutting 5-40 UNC internal threads in through-hole and blind-hole applications. Manufactured from high-speed steel (HSS) with a bright, uncoated finish, this tap delivers reliable performance in a range of common shop materials. It features 3 flutes and a plug chamfer, which provides a gradual lead-in for general-purpose tapping. The overall length is 1-15/16 inches with a 5/8-inch thread length, and the shank diameter measures 0.141 inches. The H11 thread limit designation indicates a slightly oversize tolerance, with an oversize value of 0.0050 inches, which is typical for taps used before plating or coating operations. Installed by machinists, maintenance technicians, and tool-and-die professionals.

This tap is suited for production and maintenance tapping of 5-40 UNC threads in ferrous and non-ferrous metals, plastics, and similar machinable materials. The plug chamfer makes it a practical first-choice tap for most through-hole jobs and moderately deep blind holes where a starting chamfer is acceptable. It operates with right-hand thread direction and does not require coolant-through capability, making it compatible with standard manual and CNC tapping setups without specialized tooling.

Key Features

• 5-40 UNC thread form with right-hand thread direction
• Plug chamfer for general-purpose through-hole and blind-hole tapping
• 3-flute straight flute geometry for chip control in common shop materials
• High-speed steel construction for durability across a wide range of workpiece materials
• H11 thread limit with 0.0050-inch oversize — suitable for pre-plate tapping applications
• Bright, uncoated finish for straightforward inspection and standard lubrication use

Compatibility

Designed as an OEM-style replacement or direct substitute for standard 5-40 UNC straight flute plug taps used in manual tap handles, tapping heads, and CNC rigid tapping chucks accepting a 0.141-inch shank diameter.

Installation Notes

Threading operations should be performed by qualified machinists or maintenance personnel following applicable shop safety procedures. Secure the workpiece fully before tapping and ensure the tap is properly aligned with the drilled pilot hole to prevent tap breakage. Use an appropriate cutting fluid or tapping compound for the workpiece material. Always back the tap out periodically to clear chips, particularly in deeper holes.