CHICAGO-LATROBE 1/2"-13 UNC Spiral-Point Extension Tap

The CHICAGO-LATROBE Extension Tap is used for threading blind or through holes in metal, especially where standard taps cannot reach. Its extended length allows access to recessed areas in automotive, aerospace, and general manufacturing applications. The plug chamfer and spiral-point design help push chips forward, reducing clogging.

This extension tap has a 1/2"-13 UNC thread size, H11 tolerance, 3 flutes, and a plug chamfer. It is made from black oxide high-speed steel for wear resistance and reduced friction. The manufacturer part number is 313603, and the SKU is 3G-OTH-313578. It is designed for threading in steel and other ferrous materials.

You can source the CHICAGO-LATROBE Extension Tap through 3G Electric, a global industrial equipment distributor. We handle full logistics, customs clearance, and delivery to worldwide destinations. Contact us for availability and lead time. We supply genuine CHICAGO-LATROBE tooling for industrial maintenance and production needs.

Select the tap based on thread size, material, and hole depth. For 1/2"-13 UNC threads in steel, this H11 plug-chamfer tap is suitable. Ensure the tap drill size matches the hole before threading. Use cutting fluid to extend tool life. For deeper or blind holes, the spiral-point design helps evacuate chips effectively.