Osg 1295002 Extension Tap 1/4-20 Unc Spiral Point Hss

Product Description

The OSG 1295002 is a spiral point plug extension tap designed for right-hand threading of 1/4-20 UNC internal threads in through-hole applications. Built from high-speed steel with an elektraLUBE finish, it is engineered to reduce friction and extend tool life in production threading operations. The 2-flute spiral point geometry pushes chips forward ahead of the cutting edge, making it well suited for threading through-holes in steel, aluminum, and similar materials. Overall length is 6 inches, with a neck length of approximately 1.007 inches and a reduced shank for reach into recessed or extended-depth features. Thread limit is H3 and class of fit is 3B, meeting standard UNC tolerance requirements.

This tap is used in machining, fabrication, and maintenance repair operations where standard-length taps cannot reach the work surface. The extended overall length of 6 inches allows threading in deep fixtures, through thick plates, or in tight machine setups where clearance is limited. It is appropriate for use in CNC tapping centers, drill presses, and hand-tapping applications by machinists and maintenance technicians working with 1/4-20 UNC fastener assemblies.

Key Features

• Spiral point plug geometry pushes chips forward for clean through-hole threading
• High-speed steel construction provides durability across a range of workpiece materials
• elektraLUBE finish reduces friction and improves tool life in production use
• 6-inch overall length provides extended reach into deep fixtures or recessed bores
• Reduced shank design enables use in extended-reach setups
• H3 thread limit and 3B class of fit meet standard UNC tolerance specifications

Compatibility

Designed for cutting 1/4-20 UNC right-hand internal threads in through-hole applications requiring extended tap reach; compatible with standard 1/4-20 UNC toolholders and tapping chucks accepting a reduced shank.

Installation Notes

Threading operations should be performed by qualified machinists or maintenance technicians following applicable shop safety procedures. Ensure the workpiece is securely fixtured and the spindle is at zero RPM before mounting or removing the tap. Use appropriate cutting fluid or tapping compound in addition to the elektraLUBE finish for best results in production environments. Inspect the tap for wear or chipping before each use and replace if thread form or chamfer shows visible damage.