OSG Extension Tap: 3/8"-16 UNC, H3 / 2B-3B, 3 Flute, Bottoming Chamfer
SKU 3G-OTH-310982
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Frequently Asked Questions
What is an OSG extension tap used for?
An OSG extension tap is used to cut internal threads in hard-to-reach or deep-hole applications. The 3/8"-16 UNC bottoming chamfer design allows threading close to the bottom of a blind hole, while the 3-flute spiral-flute geometry aids chip evacuation in ferrous and non-ferrous materials.
What are the specifications of the OSG 1298700 extension tap?
The OSG 1298700 is a 3/8"-16 UNC extension tap with H3 / 2B-3B tolerance, bottoming chamfer, 3 flutes, and high-speed steel construction. It is designed for through or blind hole threading and is suitable for general machining applications across multiple industries.
Where to buy OSG extension taps worldwide?
3G Electric supplies OSG extension taps like the 1298700 to customers worldwide. We handle full logistics, customs clearance, and delivery to your facility. Contact us for pricing and lead time on this and other OSG tooling across our 14 industrial departments.
How to select the correct OSG extension tap for a job?
Select an OSG extension tap based on thread size (e.g., 3/8"-16 UNC), chamfer type (bottoming for blind holes), flute count (3 for general use), and material compatibility. High-speed steel suits most ferrous metals. Confirm tolerance class (H3 / 2B-3B) matches your thread fit requirement.
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Common applications for OSGOSG Products
3G Electric supplies OSG spiral-flute extension taps. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.
