OSG Extension Tap: 5/8"-11 UNC, H3 / 2B-3B, 4 Flute, Bottoming Chamfer
SKU 3G-OTH-310969
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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 deep or hard-to-reach holes. The 5/8"-11 UNC bottoming chamfer design allows threading to the bottom of a blind hole, common in automotive, aerospace, and general machining applications.
What are the specifications of the OSG 1299300 extension tap?
The OSG 1299300 is a 5/8"-11 UNC spiral-flute extension tap with a bottoming chamfer, 4 flutes, and H3 / 2B-3B tolerance. It is made of high-speed steel (HSS) and is designed for threading blind holes in ferrous and non-ferrous materials.
Where to buy OSG extension taps worldwide?
3G Electric supplies OSG extension taps worldwide. We handle full logistics, customs clearance, and delivery to your facility. As a global industrial solutions provider, we source genuine OSG tooling and support your procurement with technical expertise across 14 industrial departments.
How to select the correct OSG extension tap for a blind hole?
Select an OSG extension tap with a bottoming chamfer for blind holes, as it threads close to the bottom. Match the thread size (5/8"-11 UNC), flute count (4), and tolerance class (H3 / 2B-3B) to your application. Use high-speed steel for general-purpose threading in steel and cast iron.
Used in
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.
