Hertel K008459AS Straight Flute Tap 3/8-24 Unf Hss

Product Description

The HERTEL K008459AS is a straight flute tap designed to cut internal 3/8-24 UNF right-hand threads in a variety of workpiece materials. Built from high-speed steel with a bright, uncoated finish, this plug-chamfer tap is suited for general-purpose through-hole and blind-hole threading applications in machine shops, maintenance environments, and production settings. The H3 thread limit ensures consistent fit to a 3B class of fit tolerance, making it appropriate where standard thread gauge acceptance is required. With 4 flutes and a 2-15/16-inch overall length, it handles chips efficiently in conventional tapping operations performed by hand or machine.

This tap is used across metalworking trades including machining, tool and die, industrial maintenance, and fabrication. It is well suited for threading steel, aluminum, and similar metals where a standard straight-flute geometry performs reliably. The plug chamfer, with its moderate lead-in, works in both through holes and sufficiently deep blind holes where full thread engagement is needed near the hole bottom. Machinists and maintenance technicians select this tap for its broad utility in manual tapping setups and CNC or turret machine applications where coolant-through tooling is not required.

Key Features

• 3/8-24 UNF thread size for fine-pitch inch thread applications
• Plug chamfer provides moderate 3-5 thread lead-in, usable in through and blind holes
• 4 straight flutes for chip control in standard tapping operations
• H3 thread limit ground to 3B class of fit tolerance
• High-speed steel construction offers durability across a range of common workpiece materials
• Bright uncoated finish, no coolant-through requirement, reduces tooling complexity

Compatibility

Designed as a standard straight flute tap for use in manual tap handles, tapping heads, and machine tapping setups configured for 3/8-24 UNF right-hand threading operations.

Installation Notes

Tapping should be performed by qualified machinists or maintenance technicians following applicable shop safety procedures. Ensure the workpiece is properly secured and the tap is aligned perpendicular to the hole before beginning the threading operation. Apply appropriate cutting fluid for the workpiece material to extend tap life and improve thread quality. Do not force a tap that has stopped rotating freely, as breakage and workpiece damage may result.