Import BDNA-22598 Hand Sti Tap 1/2-13 Unc H3 4 Flutes

Product Description

The IMPORT BDNA-22598 is a hand STI tap designed for cutting internal threads to accept Heli-Coil style thread inserts. Sized at 1/2-13 UNC with an H3 thread limit, it produces accurate oversized threads that allow a standard 1/2-13 insert to restore the thread to original nominal size. The tap features 4 flutes and a plug chamfer for general-purpose through-hole and blind-hole applications. Manufactured from high-speed steel with a bright uncoated finish, it delivers reliable cutting performance in a range of common workpiece materials. Overall length is 3-13/16 inches. This tool is sold individually.

This tap is used when repairing damaged or stripped 1/2-13 UNC threads using a Heli-Coil or compatible wire thread insert system. It is suited for maintenance and repair work in manufacturing, industrial, and field service environments. Typical applications include restoring threads in aluminum, cast iron, steel, and other machinable materials. The plug chamfer — with several tapered leading threads — makes it appropriate for starting in a hole with clearance or for tapping through-holes. It is referenced under Helicoil Reference Number 8CPB.

Key Features

• Thread size 1/2-13 UNC with H3 thread limit for proper insert fitment
• Plug chamfer provides versatile starting in through-holes and deeper blind holes
• 4-flute geometry for balanced cutting and chip clearance
• High-speed steel construction for durability across common workpiece materials
• Bright uncoated finish — ready for use with standard cutting fluids
• Overall length 3-13/16 inches for standard tap wrench compatibility

Compatibility

Designed for use with Heli-Coil style thread insert systems requiring a 1/2-13 UNC STI tap. Referenced as Helicoil Reference Number 8CPB. Verify insert system requirements before use to confirm correct tap sizing.

Installation Notes

This tap is intended for use by machinists, maintenance technicians, and trade professionals performing thread repair operations. Before tapping, drill the correct STI oversize hole per the insert manufacturer's specification — do not use a standard 1/2-13 tap drill size. Use a tap wrench and apply appropriate cutting fluid for the workpiece material. Clear chips frequently, especially in blind holes, to prevent tap breakage.