Osg 1626003708 Thread Forming Sti Tap 1/2-20 Unf H5 Hss

Product Description

The OSG 1626003708 is a thread forming STI tap designed for cutting 1/2-20 UNF internal threads in pre-drilled holes. Unlike cutting taps, thread forming taps displace material rather than remove chips, producing stronger threads with a better surface finish. This tap is manufactured from high-speed steel and carries a V (bright) finish. It features an H5 thread limit and a semi-bottoming chamfer, making it suited for threading holes that require close approach to the bottom without full bottom tap requirements. Licensed HVAC, plumbing, mechanical, and industrial technicians use this tap in production and repair applications.

This tap is intended for use on a range of materials including carbon steel, alloy steel, stainless steel, aluminum, nickel, hardened steel, and titanium alloy. The semi-bottoming chamfer provides a balance between starting ease and depth capability, making it practical for both through-hole and near-bottom hole applications. With a 3B class of fit, it produces threads that meet standard UNF tolerance specifications for general mechanical assembly.

Key Features

• Thread forming design displaces material for stronger, chip-free threads
• Semi-bottoming chamfer for near-bottom hole threading capability
• H5 thread limit for controlled 3B class of fit tolerances
• High-speed steel construction for durability across a wide range of materials
• V (bright) finish with no coating for straightforward performance in most materials
• Compatible with carbon steel, alloy steel, stainless steel, aluminum, nickel, hardened steel, and titanium alloy

Compatibility

Designed for tapping 1/2-20 UNF threads with a 3B class of fit in carbon steel, alloy steel, stainless steel, aluminum, nickel, hardened steel, and titanium alloy workpieces.

Installation Notes

This tap should be installed and used by qualified machinists or mechanical technicians familiar with tapping operations. Always ensure the workpiece is securely fixtured and the hole is properly sized per UNF tap drill charts before threading. Apply appropriate cutting fluid or tapping compound for the specific workpiece material to extend tool life and achieve consistent thread quality. Power down or disengage any driving equipment before changing or inspecting the tap.