Send a part number, a photo, or a whole BOM — we supply it and stand behind it. Worldwide shipping to 80+ countries.

3G Electric
RFQ CartGet a QuoteSign inSign up
OSG Extension Tap: 7/16"-14 UNC, H3 / 2B-3B, 4 Flute, Plug Chamfer - Pulley Taps
OSGPulley Taps

OSG Extension Tap: 7/16"-14 UNC, H3 / 2B-3B, 4 Flute, Plug Chamfer

The OSG Extension Tap (MPN 1291401) is a 7/16"-14 UNC pulley tap with a H3 / 2B-3B tolerance, 4-flute design, plug chamfer, and black oxide high-speed steel construction. 3G Electric interprets this demand and…

SKU 3G-OTH-308135

Brand
OSG
Item
Extension Tap: 7/16"-14 UNC, H3 / 2B-3B, 4 Flute, Plug Chamfer
Category
Pulley Taps
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
1291401
Type
H3 / 2B-3B, Plug Chamfer, Black Oxide High Speed Steel
Flute
4
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

Product Description

The OSG Extension Tap (MPN 1291401) is a 7/16"-14 UNC pulley tap with a H3 / 2B-3B tolerance, 4-flute design, plug chamfer, and black oxide high-speed steel construction. 3G Electric interprets this demand and sources the genuine OSG product, supporting your threading operations across 14 industrial departments with specialist depth in cutting tools.

Frequently Asked Questions

What is the OSG Extension Tap 1291401 used for?

The OSG Extension Tap 1291401 is a pulley tap designed for threading blind holes or hard-to-reach areas in industrial applications. Its extended length allows access to recessed threads, commonly used in automotive, machinery, and metalworking for creating UNC threads in steel or cast iron.

What are the specifications of the OSG Extension Tap 1291401?

The OSG Extension Tap 1291401 has a 7/16"-14 UNC thread size, H3 / 2B-3B tolerance, 4 flute design, and plug chamfer. It is made from black oxide high-speed steel (HSS) for durability and chip evacuation. The manufacturer part number is 1291401.

Where to buy the OSG Extension Tap 1291401 worldwide?

You can source the OSG Extension Tap 1291401 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 on this OSG pulley tap.

How to select the correct OSG extension tap for threading?

To select the correct OSG extension tap, match the thread size (e.g., 7/16"-14 UNC), tolerance class (H3 / 2B-3B), and chamfer type (plug) to your application. Ensure the tap length reaches the thread depth. For blind holes, use a plug or bottoming chamfer. Consult OSG's technical data for material compatibility.

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 pulley taps. 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"-16 UNC, H3 / 2B-3B, 4 Flute, Plug Chamfer, Black Oxide High Speed Steel (MPN 1291001). Key specifications — attr1315101: H3 / 2B-3B.
OSG
OSG Extension Tap: 3/8"-16 UNC, H3 / 2B-3B, 4 Flute, Plug Chamfer, Black Oxide High Speed Steel (MPN 1291001). Key specifications — attr1315101: H3 / 2B-3B.
OSG Extension Tap: 1/2"-13 UNC, H3 / 2B-3B, 4 Flute, Plug Chamfer, Black Oxide High Speed Steel (MPN 1292401). Key specifications — attr1315101: H3 / 2B-3B.
OSG
OSG Extension Tap: 1/2"-13 UNC, H3 / 2B-3B, 4 Flute, Plug Chamfer, Black Oxide High Speed Steel (MPN 1292401). Key specifications — attr1315101: H3 / 2B-3B.
OSG Extension Tap: 3/4"-10 UNC, H3 / 2B-3B, 4 Flute, Plug Chamfer, Black Oxide High Speed Steel (MPN 1293801). Key specifications — attr1315101: H3 / 2B-3B.
OSG
OSG Extension Tap: 3/4"-10 UNC, H3 / 2B-3B, 4 Flute, Plug Chamfer, Black Oxide High Speed Steel (MPN 1293801). Key specifications — attr1315101: H3 / 2B-3B.
OSG Extension Tap: 1/2"-13 UNC, H3 / 2B-3B, 4 Flute, Plug Chamfer, Black Oxide High Speed Steel (MPN 1292601). Key specifications — attr1315101: H3 / 2B-3B.
OSG
OSG Extension Tap: 1/2"-13 UNC, H3 / 2B-3B, 4 Flute, Plug Chamfer, Black Oxide High Speed Steel (MPN 1292601). Key specifications — attr1315101: H3 / 2B-3B.
OSG Extension Tap: 5/8"-11 UNC, H3 / 2B-3B, 4 Flute, Plug Chamfer, Black Oxide High Speed Steel (MPN 1293401). Key specifications — attr1315101: H3 / 2B-3B.
OSG
OSG Extension Tap: 5/8"-11 UNC, H3 / 2B-3B, 4 Flute, Plug Chamfer, Black Oxide High Speed Steel (MPN 1293401). Key specifications — attr1315101: H3 / 2B-3B.
OSG Extension Tap: 5/8"-11 UNC, H3 / 2B-3B, 4 Flute, Plug Chamfer, Black Oxide High Speed Steel (MPN 1293001). Key specifications — attr1315101: H3 / 2B-3B.
OSG
OSG Extension Tap: 5/8"-11 UNC, H3 / 2B-3B, 4 Flute, Plug Chamfer, Black Oxide High Speed Steel (MPN 1293001). Key specifications — attr1315101: H3 / 2B-3B.

More from OSG

View all OSG parts →
OSG Extension Tap: 3/8"-16 UNC, H3 / 2B-3B, 4 Flute, Plug Chamfer, Black Oxide High Speed Steel (MPN 1290801). Key specifications — attr1315101: H3 / 2B-3B.
OSG
OSG Extension Tap: 3/8"-16 UNC, H3 / 2B-3B, 4 Flute, Plug Chamfer, Black Oxide High Speed Steel (MPN 1290801). Key specifications — attr1315101: H3 / 2B-3B.
OSG Extension Tap: 1/2"-13 UNC, H3 / 2B-3B, 4 Flute, Plug Chamfer, Black Oxide High Speed Steel (MPN 1292001). Key specifications — attr1315101: H3 / 2B-3B.
OSG
OSG Extension Tap: 1/2"-13 UNC, H3 / 2B-3B, 4 Flute, Plug Chamfer, Black Oxide High Speed Steel (MPN 1292001). Key specifications — attr1315101: H3 / 2B-3B.
OSG Extension Tap: 1/4"-20 UNC, H3 / 2B-3B, 4 Flute, Plug Chamfer, Black Oxide High Speed Steel (MPN 1290001). Key specifications — attr1315101: H3 / 2B-3B.
OSG
OSG Extension Tap: 1/4"-20 UNC, H3 / 2B-3B, 4 Flute, Plug Chamfer, Black Oxide High Speed Steel (MPN 1290001). Key specifications — attr1315101: H3 / 2B-3B.
OSG Extension Tap: 1/2"-13 UNC, H3 / 2B-3B, 4 Flute, Plug Chamfer, Black Oxide High Speed Steel (MPN 1292201). Key specifications — attr1315101: H3 / 2B-3B.
OSG
OSG Extension Tap: 1/2"-13 UNC, H3 / 2B-3B, 4 Flute, Plug Chamfer, Black Oxide High Speed Steel (MPN 1292201). Key specifications — attr1315101: H3 / 2B-3B.
OSG Extension Tap: 5/8"-11 UNC, H3 / 2B-3B, 4 Flute, Plug Chamfer, Black Oxide High Speed Steel (MPN 1292801). Key specifications — attr1315101: H3 / 2B-3B.
OSG
OSG Extension Tap: 5/8"-11 UNC, H3 / 2B-3B, 4 Flute, Plug Chamfer, Black Oxide High Speed Steel (MPN 1292801). Key specifications — attr1315101: H3 / 2B-3B.
OSG Extension Tap: 3/4"-10 UNC, H3 / 2B-3B, 4 Flute, Plug Chamfer, Black Oxide High Speed Steel (MPN 1293601). Key specifications — attr1315101: H3 / 2B-3B.
OSG
OSG Extension Tap: 3/4"-10 UNC, H3 / 2B-3B, 4 Flute, Plug Chamfer, Black Oxide High Speed Steel (MPN 1293601). Key specifications — attr1315101: H3 / 2B-3B.
OSG Extension Tap: 7/16"-14 UNC, H3 / 2B-3B, 4 Flute, Plug Chamfer, Black Oxide High Speed Steel (MPN 1291601). Key specifications — attr1315101: H3 / 2B-3B.
OSG
OSG Extension Tap: 7/16"-14 UNC, H3 / 2B-3B, 4 Flute, Plug Chamfer, Black Oxide High Speed Steel (MPN 1291601). Key specifications — attr1315101: H3 / 2B-3B.
OSG Extension Tap: 3/8"-16 UNC, H3 / 2B-3B, 4 Flute, Plug Chamfer, Black Oxide High Speed Steel (MPN 1291201). Key specifications — attr1315101: H3 / 2B-3B.
OSG
OSG Extension Tap: 3/8"-16 UNC, H3 / 2B-3B, 4 Flute, Plug Chamfer, Black Oxide High Speed Steel (MPN 1291201). Key specifications — attr1315101: H3 / 2B-3B.