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OSG Extension Tap: 1/2"-20 UNF, H3 / 2B-3B, 3 Flute - Spiral-Flute Extension Taps for Steel & Stainless Steel
OSGSpiral-Flute Extension Taps for Steel & Stainless Steel

OSG Extension Tap: 1/2"-20 UNF, H3 / 2B-3B, 3 Flute

SKU 3G-OTH-315330

Brand
OSG
Item
Extension Tap: 1/2"-20 UNF, H3 / 2B-3B, 3 Flute
Category
Spiral-Flute Extension Taps for Steel & Stainless Steel
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Technical Specifications

OSG
Manufacturer Part Number
1769201
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OSG Products
3G Electric (S) Pte. Ltd. — Singapore

Frequently Asked Questions

What is the OSG extension tap 1/2"-20 UNF used for?

This OSG extension tap is designed for threading blind holes in steel and stainless steel. Its spiral-flute design evacuates chips upward, making it ideal for deep-hole tapping where chip clearance is critical. The modified bottoming chamfer allows threading close to the bottom of the hole.

What are the specifications of the OSG extension tap MPN 1769201?

The OSG extension tap MPN 1769201 has a thread size of 1/2"-20 UNF, with a tolerance class of H3 / 2B-3B. It features 3 flutes and a modified bottoming chamfer. This spiral-flute tap is designed for steel and stainless steel applications.

Where to buy OSG extension taps worldwide?

You can source OSG extension taps worldwide through 3G Electric. As a global industrial equipment distributor since 1990, we handle full logistics, customs clearance, and delivery to your site. Contact us for availability and lead times on this OSG tap.

How to select the correct OSG extension tap for stainless steel?

For stainless steel, select a spiral-flute tap like this OSG 1/2"-20 UNF model to manage chip evacuation. Ensure the tap tolerance (H3 / 2B-3B) matches your thread class requirement. Use appropriate cutting fluid and reduce speed by 20-30% compared to carbon steel tapping.

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 steel & stainless steel. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

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