OSG 1/4"-28 UNF Spiral-Flute STI Tap for Steel & Stainless Steel
The OSG Screw Thread Insert STI Tap (Spiral Flute) is a 1/4"-28 UNF bottoming-chamfer tap with an H3 / 2B-3B tolerance class and 3 flutes, designed for threading holes that will accept screw thread inserts in steel…
SKU 3G-OTH-244194
Local availability & support
- Payment
- Invoicing in USD. Bank transfer (SWIFT) and corporate PO accepted.
Need installation or engineering help?
Ask a question
Product Description
The OSG Screw Thread Insert STI Tap (Spiral Flute) is a 1/4"-28 UNF bottoming-chamfer tap with an H3 / 2B-3B tolerance class and 3 flutes, designed for threading holes that will accept screw thread inserts in steel and stainless steel. As a specialist in industrial solutions across 14 departments—including machining, electrical, and power transmission—3G Electric sources and supports this OSG tap alongside brands like Schneider, ABB, and SKF, with deep expertise in combustion, pumps, and controls.
Frequently Asked Questions
What is an OSG spiral-flute STI tap used for?
An OSG spiral-flute STI tap is used to cut internal threads in steel and stainless steel for screw thread inserts. It creates threads that accept a helical coil insert, commonly used in aerospace, automotive, and industrial maintenance to repair or strengthen tapped holes.
What are the specifications of the OSG 1/4"-28 UNF STI tap?
The OSG STI tap has a 1/4"-28 UNF thread size, H3 / 2B-3B tolerance, 3 flutes, and a bottoming chamfer. It is designed for spiral-flute tapping in steel and stainless steel. The manufacturer part number is 0146308.
Where to buy OSG taps in worldwide?
3G Electric supplies OSG taps worldwide. As a global industrial distributor, we handle full logistics, customs clearance, and delivery to your site. Contact us for availability and lead time on the OSG 1/4"-28 UNF STI tap (MPN 0146308).
How to select the correct OSG STI tap for a repair job?
Select an OSG STI tap that matches the thread size and pitch of the insert you plan to install. For steel or stainless steel, use a spiral-flute design with a bottoming chamfer for blind holes. Verify the tap tolerance (e.g., H3 / 2B-3B) matches your required thread class.
Used in
Common applications for OSGOSG Products
3G Electric supplies OSG spiral-flute sti taps for steel & stainless steel. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.
