OSG Extension Tap: 1/4"-20 UNC, H3 / 2B-3B, 3 Flute, Bottoming Chamfer
The OSG Extension Tap (MPN 1298100) is a 1/4"-20 UNC spiral-flute extension tap with a bottoming chamfer, made of high-speed steel. It features an H3 / 2B-3B tolerance class and a 3-flute design, designed for…
SKU 3G-OTH-310957
Need installation or engineering help?
Ask a question
Product Description
The OSG Extension Tap (MPN 1298100) is a 1/4"-20 UNC spiral-flute extension tap with a bottoming chamfer, made of high-speed steel. It features an H3 / 2B-3B tolerance class and a 3-flute design, designed for threading applications requiring extended reach.
Frequently Asked Questions
What is the OSG Extension Tap 1/4"-20 UNC used for?
This OSG extension tap is used for threading blind holes in hard-to-reach areas of metal components. Its 3-flute, bottoming chamfer design allows threading close to the bottom of a hole, common in automotive, aerospace, and general machining applications.
What are the specifications of the OSG Extension Tap 1298100?
The OSG Extension Tap 1298100 has a 1/4"-20 UNC thread size, H3 / 2B-3B tolerance, 3-flute design, bottoming chamfer, and is made from high-speed steel. It is a spiral-flute extension tap designed for through-hole or blind-hole threading in steel and non-ferrous materials.
Where to buy the OSG Extension Tap 1298100 worldwide?
You can source the OSG Extension Tap 1298100 through 3G Electric, a global industrial equipment distributor. We handle full logistics, customs clearance, and delivery to worldwide destinations, ensuring you receive genuine OSG tooling for your machining operations.
How to select the correct OSG extension tap for a threading job?
Select an OSG extension tap based on thread size, pitch, and material. For blind holes, choose a bottoming chamfer like this 1/4"-20 UNC tap. Ensure the tap's H3 tolerance matches your required thread class (2B-3B). Always match the tap material (HSS) to the workpiece hardness for optimal tool life.
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.
