Hertel K011020AS Spiral Point Tap 4-48 Unf Hss

Product Description

The HERTEL K011020AS is a spiral point tap designed for cutting 4-48 UNF threads in through-hole applications. It features a plug chamfer, two flutes, and a bright uncoated finish on a high-speed steel body. The spiral point geometry pushes chips ahead of the cut rather than packing them behind the tap, which makes it well suited for production tapping in through holes. The H7 thread limit indicates an oversize ground tap, with an oversize value of 0.0030 inches, providing controlled fit for applications requiring a specific tolerance class. The 0.1410-inch shank diameter and 9/16-inch thread length make this a compact tap appropriate for small-fastener work. A licensed machinist or maintenance technician typically installs this tool in a drill press, CNC machine, or hand tapping setup.

The K011020AS is used in metalworking and maintenance applications wherever 4-48 UNF threads are required in through holes. The 4-48 thread is a fine-pitch unified national fine thread common in small instrument assemblies, electronics enclosures, and precision mechanical components. This tap is appropriate for use in ferrous and non-ferrous metals at the small-screw end of the threading range. Right-hand thread direction is standard for conventional tapping operations. Coolant-through capability is not available on this tap.

Key Features

• Spiral point geometry pushes chips forward, ideal for through-hole tapping
• High-speed steel construction provides toughness across a range of workpiece materials
• H7 thread limit with 0.0030-inch oversize for controlled fit tolerances
• Plug chamfer — 3 to 5 thread lead-in — suitable for through-hole production work
• Bright uncoated finish, ready for use with standard cutting fluids
• Right-hand, 2-flute design in a compact 4-48 UNF configuration

Compatibility

Designed as an OEM-style replacement or standard supply tap for applications requiring 4-48 UNF right-hand threads in through-hole configurations.

Installation Notes

This tap is installed by a machinist or maintenance technician using a tapping head, drill press, CNC machine center, or hand tap wrench. Always ensure the workpiece is properly clamped and the pilot hole diameter is correct for the 4-48 UNF thread specification before beginning the tapping operation. Use an appropriate cutting fluid for the workpiece material to extend tool life and improve thread quality. Inspect the tap for wear or chipping before each use; a damaged tap can seize or break in the hole.