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

OSG Spiral-Flute Extension Taps for Multiple Materials.

SKU 3G-OTH-311762

Brand
OSG
Item
Extension Tap: 1/4"-28 UNF, H4 / 2B-3B, 2 Flute, Modified Bottoming Chamfer
Category
Spiral-Flute Extension Taps for Multiple Materials
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Local availability & support — Singapore

Local office
20 Woodlands Link #09-05, Singapore 738733
Phone
+65 8878 8355
Delivery
Same-day or next-business-day delivery within Singapore for in-stock items; 7–14 days for factory-order parts from Europe.
Payment
Invoicing in SGD. PayNow, bank transfer, and corporate PO accepted.
Ships to
Singapore

Technical Specifications

OSG
Manufacturer Part Number
1652501908

Technical Documents

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

Product Description

OSG Spiral-Flute Extension Taps for Multiple Materials.

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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Compatible alternatives & equivalents

Cross-referenced by specification & description
This OSG spiral-flute tap is designed for threading blind holes in materials such as steel and aluminum. The spiral flute design pushes chips upward during threading, preventing clogging and ensuring clean threads. With a modified bottoming chamfer, it is suitable for applications requiring threads close to the bottom of the hole. The tap has a 1/4"-28 UNF thread size, H2 / 2B-3B tolerance, and 3 flutes
OSG
This OSG spiral-flute tap is designed for threading blind holes in materials such as steel and aluminum. The spiral flute design pushes chips upward during threading, preventing clogging and ensuring clean threads. With a modified bottoming chamfer, it is suitable for applications requiring threads close to the bottom of the hole. The tap has a 1/4"-28 UNF thread size, H2 / 2B-3B tolerance, and 3 flutes
This OSG spiral-flute tap is designed for threading blind holes in steel and stainless steel. The spiral flute design evacuates chips upward, preventing clogging and ensuring clean threads. It features a modified bottoming chamfer for threading close to the bottom of blind holes, with tolerance class H4 for 2B or 3B fit. Common in automotive, aerospace, and general machining applications
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This OSG spiral-flute tap is designed for threading blind holes in steel and stainless steel. The spiral flute design evacuates chips upward, preventing clogging and ensuring clean threads. It features a modified bottoming chamfer for threading close to the bottom of blind holes, with tolerance class H4 for 2B or 3B fit. Common in automotive, aerospace, and general machining applications
This OSG spiral-flute tap is designed for threading blind holes in materials such as steel and stainless steel. The modified bottoming chamfer allows threading close to the bottom of the hole, while the spiral flute design evacuates chips upward, preventing clogging. It features a 1/4-28 UNF thread size, H2 / 2B-3B tolerance, and 3 flutes
OSG
This OSG spiral-flute tap is designed for threading blind holes in materials such as steel and stainless steel. The modified bottoming chamfer allows threading close to the bottom of the hole, while the spiral flute design evacuates chips upward, preventing clogging. It features a 1/4-28 UNF thread size, H2 / 2B-3B tolerance, and 3 flutes
This OSG spiral-flute tap is designed for threading blind holes in materials such as steel and stainless steel. The 3-flute design and modified bottoming chamfer facilitate upward chip evacuation, making it suitable for general-purpose tapping in machining and manufacturing applications
OSG
This OSG spiral-flute tap is designed for threading blind holes in materials such as steel and stainless steel. The 3-flute design and modified bottoming chamfer facilitate upward chip evacuation, making it suitable for general-purpose tapping in machining and manufacturing applications
This OSG spiral-flute tap is designed for general-purpose threading of blind holes. The spiral flute design evacuates chips upward, preventing clogging. It features a modified bottoming chamfer for threading close to the bottom of the hole. Suitable for use in steel and stainless steel in manufacturing and maintenance applications
OSG
This OSG spiral-flute tap is designed for general-purpose threading of blind holes. The spiral flute design evacuates chips upward, preventing clogging. It features a modified bottoming chamfer for threading close to the bottom of the hole. Suitable for use in steel and stainless steel in manufacturing and maintenance applications
General purpose spiral-flute tap with modified bottoming chamfer for threading blind holes. Spiral flute design evacuates chips upward to prevent clogging. Suitable for tapping through holes or near the bottom of blind holes in common workpiece materials
OSG
General purpose spiral-flute tap with modified bottoming chamfer for threading blind holes. Spiral flute design evacuates chips upward to prevent clogging. Suitable for tapping through holes or near the bottom of blind holes in common workpiece materials

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