We ship to the Philippines — door-to-door, customs and logistics handled by 3G Electric

3G Electric
RFQ CartGet a QuoteSign inSign up
OSG Extension Tap: 1/4"-28 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: 1/4"-28 UNF, H3 / 2B-3B, 3 Flute

SKU 3G-OTH-315311

Brand
OSG
Item
Extension Tap: 1/4"-28 UNF, H3 / 2B-3B, 3 Flute
Category
Spiral-Flute Extension Taps for Steel & Stainless Steel
Available to Order
Trade pricing by quote — replies within 24h
Qty
WhatsApp an engineer
No account needed — your quote request goes straight to our engineers. A free account lets you track quotes and re-order faster.
Worldwide Shipping
Air & sea freight
Datasheet on Request
Technical specs
1-Day Quote
Replies within 24h

Technical Specifications

OSG
Manufacturer Part Number
1768301
View Full Spec Sheet

Technical Documents

No technical documents available for this product.
Request documentation →
Not sure this is the right part? Get a recommendation.

Need installation or engineering help?

Installation, commissioning, maintenance plans, system design, and bundled product + service quotes — one team handles the full scope.
Talk to an engineer

Ask a question

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

Frequently Asked Questions

What is the OSG extension tap 1/4-28 UNF used for?

The OSG extension tap is used for threading blind holes in steel and stainless steel. Its spiral-flute design evacuates chips upward, preventing clogging, while the modified bottoming chamfer allows threading close to the hole bottom. It is ideal for automotive, aerospace, and general manufacturing applications requiring precise UNF threads.

What are the specifications of the OSG extension tap MPN 1768301?

The OSG extension tap MPN 1768301 has a 1/4-28 UNF thread size, H3 / 2B-3B tolerance, and a 3-flute modified bottoming chamfer. It is designed for steel and stainless steel. The H3 pitch diameter tolerance ensures precise fit for 2B or 3B class threads. OSG is the OEM brand for this tool.

Where to buy OSG extension taps worldwide?

You can source OSG extension taps worldwide through 3G Electric, a global industrial equipment distributor. We handle full logistics, customs clearance, and delivery to your location. Contact us for availability and lead time. 3G Electric supplies genuine OSG cutting tools for international buyers.

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

Select an OSG extension tap with spiral flutes and a modified bottoming chamfer for stainless steel. Ensure the thread size matches your application, such as 1/4-28 UNF. The H3 tolerance suits 2B or 3B thread classes. Use proper cutting fluid and rigid tapping equipment to prevent breakage and extend tool life.

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.

You might also need

Burners & Combustion →Pumps & Compressors →Spare Parts →All Products →

Similar products

Matched by specification & description
OSG Extension Tap: 3/8"-24 UNF, H3 / 2B-3B, 3 Flute, Modified Bottoming Chamfer (MPN 1768801). Key specifications — attr1315101: H3 / 2B-3B.
OSG
OSG Extension Tap: 3/8"-24 UNF, H3 / 2B-3B, 3 Flute, Modified Bottoming Chamfer (MPN 1768801). Key specifications — attr1315101: H3 / 2B-3B.
OSG Extension Tap: #10-32 UNF, H3 / 2B-3B, 3 Flute, Modified Bottoming Chamfer (MPN 1767701). Key specifications — attr1315101: H3 / 2B-3B.
OSG
OSG Extension Tap: #10-32 UNF, H3 / 2B-3B, 3 Flute, Modified Bottoming Chamfer (MPN 1767701). Key specifications — attr1315101: H3 / 2B-3B.
OSG Extension Tap: 7/16"-20 UNF, H3 / 2B-3B, 3 Flute, Modified Bottoming Chamfer (MPN 1769001). Key specifications — attr1315101: H3 / 2B-3B.
OSG
OSG Extension Tap: 7/16"-20 UNF, H3 / 2B-3B, 3 Flute, Modified Bottoming Chamfer (MPN 1769001). Key specifications — attr1315101: H3 / 2B-3B.
OSG Extension Tap: 5/16"-18 UNC, H3 / 2B-3B, 3 Flute, Modified Bottoming Chamfer (MPN 1768501). Key specifications — attr1315101: H3 / 2B-3B.
OSG
OSG Extension Tap: 5/16"-18 UNC, H3 / 2B-3B, 3 Flute, Modified Bottoming Chamfer (MPN 1768501). Key specifications — attr1315101: H3 / 2B-3B.
OSG Extension Tap: 1/2"-20 UNF, H3 / 2B-3B, 3 Flute, Modified Bottoming Chamfer (MPN 1769201). Key specifications — attr1315101: H3 / 2B-3B.
OSG
OSG Extension Tap: 1/2"-20 UNF, H3 / 2B-3B, 3 Flute, Modified Bottoming Chamfer (MPN 1769201). Key specifications — attr1315101: H3 / 2B-3B.
OSG Extension Tap: 3/8"-16 UNC, H3 / 2B-3B, 3 Flute, Modified Bottoming Chamfer (MPN 1768701). Key specifications — attr1315101: H3 / 2B-3B.
OSG
OSG Extension Tap: 3/8"-16 UNC, H3 / 2B-3B, 3 Flute, Modified Bottoming Chamfer (MPN 1768701). Key specifications — attr1315101: H3 / 2B-3B.

More from OSG

View all OSG parts →
OSG Extension Tap: #4-40 UNC, H2 / 2B-3B, 3 Flute, Bottoming Chamfer (MPN 0143701). Key specifications — attr1315101: H2 / 2B-3B.
OSG
OSG Extension Tap: #4-40 UNC, H2 / 2B-3B, 3 Flute, Bottoming Chamfer (MPN 0143701). Key specifications — attr1315101: H2 / 2B-3B.
OSG Extension Tap: 1/4"-20 UNC, H3 / 2B-3B, 3 Flute, Modified Bottoming Chamfer (MPN 1768101). Key specifications — attr1315101: H3 / 2B-3B.
OSG
OSG Extension Tap: 1/4"-20 UNC, H3 / 2B-3B, 3 Flute, Modified Bottoming Chamfer (MPN 1768101). Key specifications — attr1315101: H3 / 2B-3B.
OSG Extension Tap: 7/16"-14 UNC, H3 / 2B-3B, 3 Flute, Bottoming Chamfer (MPN 0144601). Key specifications — attr1315101: H3 / 2B-3B.
OSG
OSG Extension Tap: 7/16"-14 UNC, H3 / 2B-3B, 3 Flute, Bottoming Chamfer (MPN 0144601). Key specifications — attr1315101: H3 / 2B-3B.
OSG Extension Tap: #10-24 UNC, H3 / 2B-3B, 3 Flute, Modified Bottoming Chamfer (MPN 1767101). Key specifications — attr1315101: H3 / 2B-3B.
OSG
OSG Extension Tap: #10-24 UNC, H3 / 2B-3B, 3 Flute, Modified Bottoming Chamfer (MPN 1767101). Key specifications — attr1315101: H3 / 2B-3B.
OSG Extension Tap: 1/4"-20 UNC, H3 / 2B-3B, 3 Flute, Modified Bottoming Chamfer (MPN 1767901). Key specifications — attr1315101: H3 / 2B-3B.
OSG
OSG Extension Tap: 1/4"-20 UNC, H3 / 2B-3B, 3 Flute, Modified Bottoming Chamfer (MPN 1767901). Key specifications — attr1315101: H3 / 2B-3B.
OSG Extension Tap: #6-32 UNC, H3 / 2B-3B, 3 Flute, Modified Bottoming Chamfer (MPN 1766301). Key specifications — attr1315101: H3 / 2B-3B.
OSG
OSG Extension Tap: #6-32 UNC, H3 / 2B-3B, 3 Flute, Modified Bottoming Chamfer (MPN 1766301). Key specifications — attr1315101: H3 / 2B-3B.
OSG Extension Tap: 3/8"-16 UNC, H3 / 2B-3B, 3 Flute, Bottoming Chamfer (MPN 0144401). Key specifications — attr1315101: H3 / 2B-3B.
OSG
OSG Extension Tap: 3/8"-16 UNC, H3 / 2B-3B, 3 Flute, Bottoming Chamfer (MPN 0144401). Key specifications — attr1315101: H3 / 2B-3B.
OSG Extension Tap: 5/16"-24 UNF, H3 / 2B-3B, 3 Flute, Modified Bottoming Chamfer (MPN 1768601). Key specifications — attr1315101: H3 / 2B-3B.
OSG
OSG Extension Tap: 5/16"-24 UNF, H3 / 2B-3B, 3 Flute, Modified Bottoming Chamfer (MPN 1768601). Key specifications — attr1315101: H3 / 2B-3B.