OSG Spiral Flute Tap: 7/16"-20 UNF, H3 / 2B-3B, 3 Flute
SKU 3G-OTH-218773
Need installation or engineering help?
Ask a question
Frequently Asked Questions
What is the OSG Spiral Flute Tap 0138401 used for?
The OSG Spiral Flute Tap 0138401 is designed for threading blind holes in steel and stainless steel. Its spiral flute design efficiently evacuates chips upward, preventing clogging and ensuring clean threads. It is commonly used in automotive, aerospace, and general manufacturing applications requiring precise UNF threads.
What are the specifications of the OSG Spiral Flute Tap 0138401?
The OSG Spiral Flute Tap 0138401 has a thread size of 7/16"-20 UNF, with a H3 / 2B-3B tolerance class. It features 3 flutes and a bottoming chamfer for threading to the bottom of blind holes. The manufacturer part number is 0138401, and it is designed for steel and stainless steel.
Where to buy the OSG Spiral Flute Tap 0138401 worldwide?
You can source the OSG Spiral Flute Tap 0138401 through 3G Electric, a global industrial equipment distributor. We handle full logistics, customs clearance, and delivery to worldwide destinations. Contact us for availability and lead time; we supply OSG taps to procurement teams and engineers globally.
How to select the correct OSG Spiral Flute Tap for steel?
To select the correct OSG spiral flute tap for steel, match the thread size (e.g., 7/16"-20 UNF) and tolerance class (H3 / 2B-3B) to your application. For blind holes, choose a bottoming chamfer. Ensure the tap is rated for steel and stainless steel, as OSG designs specific geometries for chip evacuation and thread quality.
Used in
Common applications for OSGOSG Products
3G Electric supplies OSG spiral-flute taps for steel & stainless steel. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.















