Hertel K008630AS25 Straight Flute Tap 1-8 Unc Hss Tin

Product Description

The HERTEL K008630AS25 is a straight-flute plug tap designed for threading 1-8 UNC (Unified National Coarse) holes in production and maintenance machining environments. Ground from high speed steel (HSS) and coated with titanium nitride (TiN) for extended tool life, this tap produces right-hand internal threads to a 3B class of fit with an H4 thread limit. With 4 flutes and a plug chamfer, it is suited for through-hole tapping where chip clearance is managed by straight-flute geometry. Overall length is 5.125 inches with a thread length of 2.5 inches. Machinists, toolroom technicians, and maintenance mechanics typically select this tap for hand-held or machine tapping operations.

This tap is intended for ferrous and non-ferrous materials where a 1-8 UNC thread form is specified. The plug chamfer — typically 3 to 5 threads of lead — makes it suitable for through-holes and for following a bottoming tap in blind-hole sequences. The TiN coating reduces friction and wear, extending run life compared to uncoated HSS taps. It is a standard-type tap appropriate for CNC machining centers, drill presses, or manual tapping operations across job shop, industrial maintenance, and MRO environments.

Key Features

• 1-8 UNC thread size with right-hand thread direction
• Plug chamfer for through-hole tapping and multi-step blind-hole sequences
• 4 straight flutes for controlled chip formation in through-hole applications
• High speed steel construction for toughness and regrindability
• TiN coating extends tool life and reduces built-up edge
• H4 thread limit and 3B class of fit for standard commercial thread tolerance
• No coolant-through requirement — suitable for conventional flood or dry tapping setups

Compatibility

Designed as a standard-type replacement or production tap for any application requiring a 1-8 UNC right-hand internal thread, 3B class of fit, with an H4 thread limit in straight-flute tap holders or manual tap wrenches.

Installation Notes

Install in a tap holder, floating tap head, or manual tap wrench sized for the tap shank before use. Ensure the workpiece is securely fixtured and the pilot hole is drilled to the correct tap drill diameter for 1-8 UNC before beginning the threading operation. Apply appropriate cutting fluid for the workpiece material to reduce heat and improve thread finish. Follow standard shop safety practices — inspect the tap for cracks or wear before each use and replace if any damage is observed.