STI Tap 1/2”-20, Hi-Helix, HSS, WIDELL, USA, New/Other: This is new/old inventory. The tap is marked “Widell 1/2-20 STI HS 3B 147486-2 ”. STI taps are used to make threads for Helicoil Type thread repair inserts. The Hi-Helix makes these taps applicable when the span is interrupted or when chip lifting and removal are an issue. This STI tap is sold with the Kent’s Tools 30 Day Satisfaction Guarantee.
