OSG Screw Thread Insert STI Tap: Spiral Fute, 1/4"-20 UNC, H2 / 2B-3B
SKU 3G-OTH-281089
Need installation or engineering help?
Ask a question
Frequently Asked Questions
What is an OSG Screw Thread Insert STI Tap used for?
An OSG Screw Thread Insert STI Tap is used to cut internal threads in multiple materials for installing helical wire thread inserts. It is commonly applied in aerospace, automotive, and general manufacturing to repair or reinforce threaded holes in aluminum, steel, and cast iron.
What are the specifications of the OSG STI Tap 31500708?
The OSG STI Tap 31500708 is a spiral-flute tap with a 1/4"-20 UNC thread size, H2 / 2B-3B tolerance, and 3 flutes. It is designed for tapping holes that will accept screw thread inserts in multiple materials. The manufacturer part number is 31500708.
Where to buy OSG STI Taps worldwide?
You can source OSG STI Taps worldwide through 3G Electric, a global industrial equipment distributor. We handle full logistics, customs clearance, and delivery to your location. Contact us for availability and lead time on the OSG 31500708 spiral-flute tap.
How to select the correct OSG STI Tap size?
To select the correct OSG STI Tap, match the tap thread size to the insert's internal thread requirement. For example, a 1/4"-20 UNC tap is used for inserts requiring that thread. Ensure the tap tolerance (H2 / 2B-3B) aligns with your desired class of fit for the finished thread.
Used in
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.















