OSG Spiral Flute Tap: 7/16"-20 UNF, H5 / 2B-3B, 3 Flute, Bottoming Chamfer (MPN 0138508)
SKU 3G-OTH-217854
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Frequently Asked Questions
What is the OSG spiral flute tap 0138508 used for?
The OSG spiral flute tap 0138508 is designed for threading blind holes in steel and stainless steel. Its spiral flute design lifts chips upward, preventing clogging and ensuring clean threads. It is commonly used in automotive, aerospace, and general machining applications where precise internal threads are required.
What are the specifications of the OSG spiral flute tap 0138508?
The OSG spiral flute tap 0138508 has a thread size of 7/16"-20 UNF, with an H5 tolerance for class 2B-3B fit. It features 3 flutes and a bottoming chamfer, making it suitable for threading to the bottom of blind holes. The manufacturer part number is 0138508.
Where to buy the OSG spiral flute tap 0138508 worldwide?
3G Electric supplies the OSG spiral flute tap 0138508 to customers worldwide. As a global industrial solutions provider, we handle full logistics, customs clearance, and delivery to your location. Contact us for pricing and lead time on this precision threading tool.
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), tolerance (H5 for 2B-3B), and chamfer type (bottoming for blind holes). Ensure the tap is rated for steel and stainless steel. OSG taps are known for durability and chip evacuation in demanding materials.
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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.















