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OSG Extension Tap: 1/4"-28 UNF, H4 / 2B-3B, 2 Flute - Spiral-Flute Extension Taps for Multiple Materials
OSGSpiral-Flute Extension Taps for Multiple Materials

OSG Extension Tap: 1/4"-28 UNF, H4 / 2B-3B, 2 Flute

SKU 3G-OTH-311762

Brand
OSG
Item
Extension Tap: 1/4"-28 UNF, H4 / 2B-3B, 2 Flute
Category
Spiral-Flute Extension Taps for Multiple Materials
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Technical Specifications

OSG
Manufacturer Part Number
1652501908
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OSG Products
3G Electric (S) Pte. Ltd. — Singapore

Frequently Asked Questions

What is the OSG Extension Tap 1/4"-28 UNF used for?

This OSG extension tap is designed for threading blind or deep holes in multiple materials. Its spiral-flute design evacuates chips upward, making it ideal for production tapping in steel, aluminum, and cast iron. The modified bottoming chamfer allows threading close to the hole bottom.

What are the specifications of the OSG Extension Tap 1/4"-28 UNF?

The OSG extension tap has a 1/4"-28 UNF thread size, H4 / 2B-3B tolerance, 2-flute spiral-flute design, and a modified bottoming chamfer. The manufacturer part number is 1652501908. It is designed for threading multiple materials in deep or blind-hole applications.

Where to buy the OSG Extension Tap 1/4"-28 UNF worldwide?

3G Electric supplies the OSG Extension Tap 1/4"-28 UNF worldwide. As a global industrial distributor, we handle full logistics, customs clearance, and delivery to your location. Contact us for availability and lead time. We source and deliver this OSG tap to any country.

How to select the correct OSG extension tap for threading?

Select the OSG extension tap based on thread size (1/4"-28 UNF), hole depth, and material. For blind holes, use a modified bottoming chamfer. The H4 / 2B-3B tolerance ensures proper fit. Match the tap flute design (spiral-flute) to chip evacuation needs. OSG taps are precision-ground for consistent performance.

Used in

Common applications for OSG
Automotive engine block production — OSG micro drill bits for oil gallery and coolant passage drilling in cast iron
Medical device manufacturing — OSG micro drill bits for drilling bone screw pilot holes in stainless steel implants
Aerospace component machining — OSG micro drill bits for fastener holes in titanium alloy structural parts
Mold and die making — OSG micro drill bits for cooling channel drilling in hardened tool steel (HRC 45-50)
Electronics enclosure fabrication — OSG micro drill bits for precision holes in aluminum alloy housings (with appropriate coating selection)
General engineering job shops — OSG micro drill bits for small-diameter hole drilling in mild steel and alloy steel parts

OSG Products

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

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