Hertel K099419AS Spiral Point Tap 3/4-10 Unc 3 Flutes

Product Description

The HERTEL K099419AS is a spiral point tap designed for cutting 3/4-10 UNC threads in through-hole and blind-hole applications where full thread engagement is required close to the bottom. Made from high-speed steel with a bright uncoated finish, this tap drives chips forward ahead of the cutting zone, keeping flutes clear during the threading pass. It features a bottoming chamfer, allowing threads to be formed close to the base of a hole. The H3 thread limit provides a controlled fit tolerance suitable for most standard UNC fastener assemblies. Three flutes offer a balance of chip clearance and cutting edge strength across a range of materials.

This tap is suited for job shop, maintenance, and production environments where 3/4-10 UNC internal threads are required. The bottoming chamfer style makes it the go-to choice when threading must begin at or near the bottom of a blind hole after a plug or taper tap has started the thread. Machinists and tool-and-die professionals working with ferrous metals and general engineering materials will find this a standard fit for manual or low-speed machine tapping operations where coolant-through tooling is not required.

Key Features

• 3/4-10 UNC thread form with H3 thread limit for controlled tolerance fit
• Bottoming chamfer allows threading to the full depth of blind holes
• High-speed steel construction provides durability across a wide range of workpiece materials
• Bright uncoated finish for general-purpose applications where coatings are not required
• 3-flute design balances chip clearance with cutting edge strength
• 2-inch thread length accommodates deep engagement requirements

Compatibility

Designed as an OEM-style replacement or direct equivalent for standard 3/4-10 UNC spiral point bottoming taps used in manual tapping, drill press, and low-speed machine tapping setups.

Installation Notes

Spiral point taps should be installed by qualified machinists or tooling professionals familiar with proper tapping procedures. Before tapping, ensure the workpiece is securely fixtured and the pilot hole diameter matches the required tap drill size for 3/4-10 UNC. Apply appropriate cutting fluid for the workpiece material to reduce heat buildup and extend tap life. Never force a tap against solid material at the bottom of a blind hole — use the bottoming tap only after the thread has been started with a plug or taper tap.