OSG Screw Thread Insert STI Tap: Spiral Point, 5/8"-18 UNF, H4 / 2B-3B, 4 Flute

The OSG Screw Thread Insert STI Tap is used to cut internal threads in multiple materials for accepting screw thread inserts. It is commonly applied in aerospace, automotive, and general manufacturing where thread repair or reinforcement is needed. The spiral-point design pushes chips forward, making it suitable for through-hole applications.

This OSG STI Tap has a UNF thread size of 5/8"-18, a thread class of H4 / 2B-3B, a plug chamfer, and 4 flutes. The spiral-point geometry is designed for through-hole threading in multiple materials. The manufacturer part number is 31403108.

You can source OSG STI Taps worldwide through 3G Electric, a global industrial equipment distributor established in 1990. We handle full logistics, customs clearance, and delivery to your location. Contact us for availability and lead time on this OSG 5/8"-18 UNF STI Tap.

To select the correct OSG STI Tap, match the tap thread size and pitch to the insert's internal thread specification. For this tap, use a 5/8"-18 UNF insert. The H4 / 2B-3B tolerance ensures proper fit for the insert. Always verify the chamfer type—plug chamfer is standard for most applications.