CHICAGO-LATROBE Extension Tap: 1/4"-20 UNC, H11, 3 Flute, Plug Chamfer
SKU 3G-OTH-313656
Need installation or engineering help?
Ask a question
Frequently Asked Questions
What is a CHICAGO-LATROBE extension tap used for?
A CHICAGO-LATROBE extension tap is used to cut internal threads in deep or hard-to-reach holes. The extended shank allows access where standard taps cannot reach, making it ideal for maintenance, repair, and production work across machining and industrial applications.
What are the specifications of the CHICAGO-LATROBE 1/4"-20 UNC extension tap?
This CHICAGO-LATROBE extension tap has a 1/4"-20 UNC thread size, H11 tolerance, 3 flutes, and a plug chamfer. It is made from black oxide high-speed steel (MPN 313599). These specs ensure precise threading in steel and other materials.
Where to buy CHICAGO-LATROBE extension taps worldwide?
3G Electric supplies CHICAGO-LATROBE extension taps worldwide. As a global industrial solutions provider, we handle full logistics, customs clearance, and delivery to your facility. Contact us to order the 1/4"-20 UNC tap (SKU 449R96) or other sizes.
How to select the right extension tap for deep hole threading?
Select an extension tap like this CHICAGO-LATROBE 1/4"-20 UNC model based on thread size, material (black oxide HSS for steel), and reach needed. Match the chamfer type (plug for through holes) and flute count (3 for chip clearance) to your application for best results.
Used in
Common applications for CHICAGO-LATROBECHICAGO-LATROBE Products
3G Electric supplies CHICAGO-LATROBE spiral-point extension taps. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.















