The patented design of the Big Gator Tools STI-UNF Standard Fine V-Tap Guide ensures straight and accurate tap alignment every time. For Helicoil type ground fine thread taps. Great for repair jobs or new screw thread insert jobs, and works on flat surfaces, round parts, or corners, for multiple tapping applications.
The guide holes for this model are sized for 9 ANSI Unified Fine Screw Thread Insert (STI) type ground taps. UNC & UNF Tap guides are used to tap holes for specialty threaded inserts (ex. Helicoil). The inserts are Used routinely by machinists and mechanics when a hole is so damaged that normal tapping will not fix the thread and the insert must be used to put back the correctly sized screw or bolt hole.
The bottom on the tap guide is precision ground to assure stability and accurate perpendicular alignment on flat surfaces. The V-groove in the bottom center of the guide allows for perpendicular alignment with all tap sizes on round parts and corners.
Made from special nickel alloyed steel that is heat treated for durability. Guide is approximately 5" long. Comes in plastic storage case. Lifetime warranty. Patented. USA
Guide Hole Sizes: 8-36; 10-32; 1/4-28, 5/16-24; 3/8-24; 7/16-20; 1/2-20; and 5/8-18.