Osg 1759001 Spiral Point Tap 2-56 Unc Plug 2 Flute

Product Description

The OSG 1759001 is a spiral point tap designed for cutting internal threads in a wide range of challenging materials. It features a 2-56 UNC thread form with a plug chamfer, 2 flutes, and an H2 thread limit for consistent dimensional control. The powdered metal construction delivers higher wear resistance than standard high-speed steel, making it well suited for production threading in tough alloys. A steam oxide coating reduces friction and improves chip flow. This tap produces right-hand threads and is sized for the 2-56 UNC thread standard, commonly encountered in precision assembly and light mechanical applications.

This tap is appropriate for threading operations in hardened steel, stainless steel, high-nickel alloy, titanium, alloy steel, and die steel. The plug chamfer distributes cutting load across several leading threads, making it a practical choice for through-hole applications. It fits standard tap holders used in machine tapping and CNC operations, as well as hand-tapping setups where fine-thread precision is required in small-diameter holes.

Key Features

• 2-56 UNC thread form with plug chamfer for through-hole threading
• Powdered metal construction for enhanced wear resistance in difficult materials
• Steam oxide coating reduces friction and promotes chip evacuation
• H2 thread limit ensures consistent 2B class of fit tolerances
• Right-hand cut, no coolant-through requirement
• Compact geometry suited for small-diameter precision threading

Compatibility

Designed for use in hardened steel, stainless steel, high-nickel alloy, titanium, alloy steel, and die steel. Fits standard straight-shank tap holders accepting a 0.141-inch shank diameter.

Installation Notes

This tap should be installed by a machinist or qualified technician familiar with tapping operations and proper speeds and feeds for small-diameter taps. Ensure the workpiece is securely fixtured and the correct tap drill size for 2-56 UNC is used before tapping. Apply an appropriate cutting fluid for the workpiece material to reduce heat and extend tool life. Avoid reversing direction mid-thread, as small-diameter taps are susceptible to breakage under torsional stress.