Hertel K007108AS Hand Sti Tap 2-56 Unc H2 3 Flutes

Product Description

The HERTEL K007108AS is a hand STI tap designed for cutting screw thread inserts in 2-56 UNC threaded holes. STI taps cut an oversized thread profile that accepts helical wire inserts, restoring or reinforcing threads in stripped or damaged bores. This tap features a bottoming chamfer, allowing it to cut threads close to the bottom of a blind hole where a taper or plug chamfer cannot reach. Built from high speed steel with a bright finish, it delivers reliable cutting performance in common metals and alloys. The H2 thread limit keeps tolerances tight for consistent insert fit. With a 3-flute geometry, it channels chips efficiently and provides solid tool stability during hand tapping operations.

This tap is suited for maintenance, repair, and fabrication work requiring thread insert installation in fine-pitch 2-56 UNC holes. It is commonly used in precision assemblies where small fastener threads need reinforcement, including aerospace components, electronic housings, and instrument panels. The bottoming chamfer makes it the correct choice for blind holes where full thread depth is required to the base of the bore. Licensed machinists, toolmakers, and maintenance technicians typically select this tap for hand-driven insert thread preparation.

Key Features

• 2-56 UNC thread size for fine-pitch small-diameter tapping
• Bottoming chamfer enables threading to the bottom of blind holes
• H2 thread limit provides tight tolerance control for STI insert fitment
• 3-flute design promotes chip evacuation and tool stability
• High speed steel construction offers durability across a range of workpiece materials
• Bright finish with no coating buildup for accurate thread form

Compatibility

Designed as an OEM-style hand tap for STI thread insert applications in 2-56 UNC threaded holes requiring a bottoming chamfer profile.

Installation Notes

This tap is intended for hand tapping operations using a tap wrench. Always back the tap out periodically to break and clear chips, especially in blind holes. Secure the workpiece firmly before tapping and apply appropriate cutting fluid for the workpiece material to extend tool life and improve thread finish. Follow standard shop safety practices and applicable machining guidelines when working with small-diameter taps, which are susceptible to breakage under side load or excessive torque.