OSG Screw Thread Insert STI Tap: Spiral Point, 1/2"-20 UNF, H4 / 2B-3B, 3 Flute
The OSG Screw Thread Insert STI Tap is a spiral-point tap for multiple materials, featuring a 1/2"-20 UNF thread size, H4 / 2B-3B tolerance, 3-flute design, and plug chamfer (MPN 31402308).
SKU 3G-OTH-284703
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Product Description
The OSG Screw Thread Insert STI Tap is a spiral-point tap for multiple materials, featuring a 1/2"-20 UNF thread size, H4 / 2B-3B tolerance, 3-flute design, and plug chamfer (MPN 31402308).
Frequently Asked Questions
What is the OSG Screw Thread Insert STI Tap used for?
The OSG Screw Thread Insert STI Tap is used to cut internal threads in multiple materials before installing a screw thread insert. It is commonly applied in aerospace, automotive, and general manufacturing where thread repair or reinforcement is needed.
What are the specifications of the OSG STI Tap 31402308?
This OSG STI Tap has a 1/2"-20 UNF thread size, H4 / 2B-3B tolerance, 3 flutes, and a plug chamfer. It is a spiral-point design for efficient chip evacuation. The manufacturer part number is 31402308.
Where to buy the OSG Screw Thread Insert STI Tap worldwide?
You can source the OSG Screw Thread Insert STI Tap through 3G Electric, a global industrial equipment distributor. We handle full logistics, customs clearance, and delivery to worldwide locations, ensuring you receive the correct OSG tool for your application.
How to select the correct OSG STI Tap for thread inserts?
Select an OSG STI Tap based on the thread size and tolerance required for your insert. For a 1/2"-20 UNF insert, use this H4 / 2B-3B tap with a plug chamfer. Always match the tap to the insert manufacturer's specifications for proper thread fit.
Used in
Common applications for OSGOSG Products
3G Electric supplies OSG spiral-point sti taps for multiple materials. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.















