OSG Screw Thread Insert STI Tap: Spiral Fute, 9/16"-12 UNC, H3 / 2B-3B
SKU 3G-OTH-281072
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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 for installing screw thread inserts. It is commonly applied in aerospace, automotive, and general manufacturing where strong, wear-resistant threads are required in softer base materials.
What are the specifications of the OSG 31502401 STI Tap?
The OSG 31502401 is a spiral-flute STI tap with a 9/16"-12 UNC thread size, H3 / 2B-3B tolerance, and 4 flutes. It is designed for threading holes that will accept screw thread inserts, providing accurate thread formation in various materials.
Where to buy the OSG 31502401 STI Tap worldwide?
You can source the OSG 31502401 STI Tap worldwide through 3G Electric, a global industrial equipment distributor. We handle full logistics, customs clearance, and delivery to your location, ensuring you receive genuine OSG tooling for your threading applications.
How to select the correct OSG STI tap for a thread insert?
Select an OSG STI tap by matching the thread size and pitch to the insert requirements. For the 9/16"-12 UNC, use the H3 / 2B-3B tolerance tap. Ensure the tap is designed for the base material (e.g., aluminum, steel) and that the spiral-flute geometry suits the hole depth and chip evacuation needs.
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Common applications for OSGOSG Products
3G Electric supplies OSG spiral-flute sti taps for multiple materials. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.















