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OSG Extension Tap: 3/8"-16 UNC, H3 / 2B-3B, 3 Flute, Plug Chamfer - Spiral-Point Extension Taps
OSGSpiral-Point Extension Taps

OSG Extension Tap: 3/8"-16 UNC, H3 / 2B-3B, 3 Flute, Plug Chamfer

The OSG Extension Tap (SKU 3G-OTH-313584) is a 3/8"-16 UNC spiral-point extension tap, type H3 / 2B-3B with a plug chamfer, made of high-speed steel and featuring 3 flutes (MPN 1295300). 3G Electric sources this…

SKU 3G-OTH-313584

Brand
OSG
Item
Extension Tap: 3/8"-16 UNC, H3 / 2B-3B, 3 Flute, Plug Chamfer
Category
Spiral-Point Extension Taps
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Local availability & support

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Worldwide DHL shipping from Singapore; 7–14 business days door-to-door for most destinations.
Payment
Invoicing in USD. Bank transfer (SWIFT) and corporate PO accepted.

Technical Specifications

OSG
Manufacturer Part Number
1295300
Type
H3 / 2B-3B, Plug Chamfer, High Speed Steel
Flute
3

Technical Documents

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

Product Description

The OSG Extension Tap (SKU 3G-OTH-313584) is a 3/8"-16 UNC spiral-point extension tap, type H3 / 2B-3B with a plug chamfer, made of high-speed steel and featuring 3 flutes (MPN 1295300). 3G Electric sources this genuine industrial cutting tool as part of our broad supply across 14 departments, with specialist expertise in combustion, pumps and controls.

Frequently Asked Questions

What is the OSG Extension Tap 1295300 used for?

The OSG Extension Tap 1295300 is used for threading blind or deep holes in metal parts where standard taps cannot reach. It is common in automotive, aerospace, and general machining for creating 3/8"-16 UNC threads in steel and other materials.

What are the specifications of the OSG Extension Tap 1295300?

This OSG extension tap has a 3/8"-16 UNC thread size, H3 / 2B-3B tolerance, 3-flute spiral-point design, and plug chamfer. It is made of high-speed steel (HSS) and has manufacturer part number 1295300. It is suitable for through-hole or blind-hole threading.

Where to buy the OSG Extension Tap 1295300 worldwide?

You can source the OSG Extension Tap 1295300 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.

How to select the correct OSG extension tap for a job?

Select an OSG extension tap based on thread size (e.g., 3/8"-16 UNC), material (HSS for general steel), flute count (3-flute for balance), and chamfer type (plug for most applications). Ensure the tap length reaches the hole depth. OSG taps are precision-ground for consistent thread class H3.

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-point extension taps. 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
OSG Extension Tap: 5/16"-18 UNC, H3 / 2B-3B, 2 Flute, Plug Chamfer, High Speed Steel (MPN 1295200)
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OSG Extension Tap: 5/16"-18 UNC, H3 / 2B-3B, 2 Flute, Plug Chamfer, High Speed Steel (MPN 1295200)
OSG Extension Tap: 1/2"-13 UNC, H3 / 2B-3B, 3 Flute, Plug Chamfer, High Speed Steel (MPN 1295500)
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OSG Extension Tap: 1/2"-13 UNC, H3 / 2B-3B, 3 Flute, Plug Chamfer, High Speed Steel (MPN 1295500)
OSG Extension Tap: 1/4"-20 UNC, H3 / 2B-3B, 2 Flute, Plug Chamfer, High Speed Steel (MPN 1295000)
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OSG Extension Tap: 1/4"-20 UNC, H3 / 2B-3B, 2 Flute, Plug Chamfer, High Speed Steel (MPN 1295000)
OSG Extension Tap: 1/4"-20 UNC, H3 / 2B-3B, 2 Flute, Plug Chamfer, High Speed Steel (MPN 1294900)
OSG
OSG Extension Tap: 1/4"-20 UNC, H3 / 2B-3B, 2 Flute, Plug Chamfer, High Speed Steel (MPN 1294900)
OSG Extension Tap: 5/8"-11 UNC, H3 / 2B-3B, 3 Flute, Plug Chamfer, High Speed Steel (MPN 1295600)
OSG
OSG Extension Tap: 5/8"-11 UNC, H3 / 2B-3B, 3 Flute, Plug Chamfer, High Speed Steel (MPN 1295600)
OSG Extension Tap: 3/8"-16 UNC, H3 / 2B-3B, 3 Flute, Plug Chamfer, High Speed Steel (MPN 2103800)
OSG
OSG Extension Tap: 3/8"-16 UNC, H3 / 2B-3B, 3 Flute, Plug Chamfer, High Speed Steel (MPN 2103800)

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OSG Extension Tap: 7/16"-14 UNC, H3 / 2B-3B, 3 Flute, Plug Chamfer, Black Oxide High Speed Steel (MPN 1295401)
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OSG Extension Tap: 7/16"-14 UNC, H3 / 2B-3B, 3 Flute, Plug Chamfer, Black Oxide High Speed Steel (MPN 1295401)
OSG Extension Tap: 7/16"-14 UNC, H3 / 2B-3B, 3 Flute, Plug Chamfer, High Speed Steel (MPN 1295400)
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OSG Extension Tap: 7/16"-14 UNC, H3 / 2B-3B, 3 Flute, Plug Chamfer, High Speed Steel (MPN 1295400)