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OSG #8-32 UNC Spiral-Point Extension Tap - Spiral-Point Extension Taps
OSGSpiral-Point Extension Taps

OSG #8-32 UNC Spiral-Point Extension Tap

The OSG Extension Tap (#8-32 UNC, MPN 1294401) is a spiral-point extension tap with a plug chamfer, black oxide high-speed steel construction, and H3 / 2B-3B thread tolerance. It features 2 flutes and is designed for…

SKU 3G-OTH-313663

Brand
OSG
Item
#8-32 UNC Spiral-Point Extension Tap
Part Number
1294401
Category
Spiral-Point Extension Taps
Available to Order
Also known as:1294401OSG
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Technical Specifications

OSG
Manufacturer Part Number
1294401
Type
H3 / 2B-3B, Plug Chamfer, Black Oxide High Speed Steel
Flute
2

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OSG Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The OSG Extension Tap (#8-32 UNC, MPN 1294401) is a spiral-point extension tap with a plug chamfer, black oxide high-speed steel construction, and H3 / 2B-3B thread tolerance. It features 2 flutes and is designed for through-hole threading applications.

Frequently Asked Questions

What is the OSG #8-32 UNC Extension Tap used for?

The OSG #8-32 UNC Extension Tap is used for threading blind or through holes in metal parts where standard taps cannot reach. Its extended length and spiral-point design push chips forward, making it ideal for automotive, aerospace, and general machining applications requiring precise internal threads.

What are the specifications of the OSG Extension Tap 1294401?

The OSG Extension Tap 1294401 is a #8-32 UNC spiral-point tap with a plug chamfer and 2 flutes. It is made of black oxide high-speed steel with an H3 / 2B-3B thread tolerance. This design ensures accurate threading in medium-hard materials and is suitable for both 2B and 3B class fits.

Where to buy OSG taps in worldwide?

You can source the OSG Extension Tap 1294401 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 genuine OSG cutting tools for manufacturing and maintenance operations.

How to select the correct OSG extension tap for a job?

To select the correct OSG extension tap, match the thread size (#8-32 UNC), chamfer type (plug for blind holes), and material (high-speed steel for general use). Verify the thread tolerance (H3 / 2B-3B) matches your required fit class. Ensure the tap length provides sufficient reach for your workpiece geometry.

Used in

Common applications for OSG
Aerospace — OSG STI taps for installing helical wire thread inserts in aluminum components
Automotive — OSG spiral-point taps for through-hole threading in engine blocks and transmission cases
General machining — OSG spiral-flute taps for blind-hole threading in steel and stainless steel parts
Heavy equipment repair — OSG thread-forming taps for creating threads in ductile iron and steel castings
Precision manufacturing — OSG solid carbide chucking reamers for finishing holes in hydraulic manifolds
Die and mold — OSG coolant-through solid carbide drills for deep-hole drilling in tool steels
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OSG Products

3G Electric supplies OSG spiral-point extension taps. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

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High-speed steel spiral-point extension tap for threading blind or deep holes where standard taps cannot reach. #4-40 UNC thread size, H2 tolerance for 2B-3B class fit, plug chamfer, and 2 flutes. Spiral-point design pushes chips forward for efficient chip evacuation in through-hole applications

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