Osg 1765601 Extension Tap 5/8-11 Spiral Point Plug

Product Description

The OSG 1765601 is a spiral point plug extension tap designed for threading 5/8-11 UNC right-hand threads in through-hole applications. Built from vanadium high-speed steel and finished with a steam oxide coating, this tap delivers improved lubricity and corrosion resistance during cutting operations. At 6 inches overall length, it reaches into deep or recessed workpiece features where standard-length taps cannot. The H3 thread limit provides the tolerance consistency required for 3B class of fit threads. Three flutes with a spiral point design push chips forward ahead of the cutting action, keeping the flutes clear during machine tapping.

This extension tap is suited for production and maintenance machining environments where through-hole threading is performed on carbon steel, hardened steel, and stainless steel workpieces. The reduced shank and extended neck allow access in fixtures or bored features with limited clearance. Typical users include machinists, tool and die makers, and maintenance professionals working on manual mills, CNC machining centers, or drill presses equipped with tapping attachments.

Key Features

• Spiral point plug chamfer pushes chips forward, ideal for through-hole threading
• Vanadium high-speed steel construction for durability in steel and stainless steel applications
• Steam oxide finish improves lubricity and reduces galling during the tapping process
• H3 thread limit ensures consistent 3B class of fit tolerance across production runs
• Reduced shank with extended neck reaches deep or obstructed hole locations
• Right-hand flute and thread direction for standard machine tapping setups

Compatibility

Designed for threading 5/8-11 UNC right-hand through holes in carbon steel, hardened steel, and stainless steel workpieces. Suitable for use with standard tapping heads and CNC rigid tapping spindles accepting the reduced shank diameter.

Installation Notes

This tap should be installed and operated by a qualified machinist following standard tapping practices. Ensure the workpiece is securely fixtured and the spindle is properly aligned before beginning the tapping cycle. Use an appropriate cutting fluid for the workpiece material to extend tap life and maintain thread quality. Inspect the tap for wear or chipping before each use and replace when cutting performance degrades.