Import BDNA-22589 Hand Sti Tap 10-32 Unf H2 3 Flutes

Product Description

The IMPORT BDNA-22589 is a hand STI (Screw Thread Insert) tap designed to cut 10-32 UNF threads for thread insert installation in tapped holes. Built from high-speed steel with a bright, uncoated finish, it runs an H2 thread limit for close-tolerance fits. The plug chamfer — typically 3 to 5 threads of lead — makes it suitable for through-holes and most blind-hole applications where a partial lead-in is acceptable. With 3 flutes for efficient chip clearance and a 1-inch thread length, this tap is sized for light-gauge metal and precision assemblies. Machinists, maintenance techs, and HVAC or electrical service professionals reach for STI taps when restoring damaged threads using Helicoil-style inserts.

This tap is used in applications where a standard thread has stripped or been damaged and a coiled wire thread insert is needed to restore full thread strength. The 10-32 UNF size is common in electrical enclosures, control panels, HVAC equipment, and light mechanical assemblies. The 2.5-inch overall length provides adequate clearance for most hand-tap wrench setups. It is sold individually and is appropriate for both shop use and field repair work.

Key Features

• 10-32 UNF thread form sized for Helicoil-style screw thread insert installation
• H2 thread limit for controlled, close-tolerance thread fit
• Plug chamfer provides 3-5 thread lead-in, suitable for through-holes and most blind holes
• 3-flute geometry promotes chip evacuation during hand tapping
• High-speed steel construction offers durability across steel, aluminum, and similar materials
• Bright, uncoated finish — Helicoil reference number 3FPB

Compatibility

Designed for use with 10-32 UNF Helicoil-style screw thread inserts in standard STI tap-drill and insert installation sequences. Helicoil reference number 3FPB.

Installation Notes

Install using a calibrated hand tap wrench — do not use power drivers for hand taps, as over-torquing will break the tap or distort threads. Ensure the correct STI tap-drill size has been used to prepare the hole before tapping. Back the tap out periodically to clear chips, especially in blind holes. Always de-energize or isolate any equipment before performing thread repair work on energized panels or mechanical assemblies.