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OSG Extension Tap: 5/16"-18 UNC, H3 / 2B-3B, 3 Flute, Plug Chamfer - Spiral-Point Extension Taps
OSGSpiral-Point Extension Taps

OSG Extension Tap: 5/16"-18 UNC, H3 / 2B-3B, 3 Flute, Plug Chamfer

The OSG Extension Tap (5/16"-18 UNC, MPN 1293501) is a spiral-point extension tap with an H3 / 2B-3B tolerance, 3-flute design, plug chamfer, and black oxide high-speed steel construction. 3G Electric sources this…

SKU 3G-OTH-313665

Brand
OSG
Item
Extension Tap: 5/16"-18 UNC, H3 / 2B-3B, 3 Flute, Plug Chamfer
Category
Spiral-Point Extension Taps
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Technical Specifications

OSG
Manufacturer Part Number
1293501
Type
H3 / 2B-3B, Plug Chamfer, Black Oxide High Speed Steel
Flute
3
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OSG Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The OSG Extension Tap (5/16"-18 UNC, MPN 1293501) is a spiral-point extension tap with an H3 / 2B-3B tolerance, 3-flute design, plug chamfer, and black oxide high-speed steel construction. 3G Electric sources this genuine OSG tool for your threading applications.

Frequently Asked Questions

What is the OSG Extension Tap 1293501 used for?

The OSG Extension Tap 1293501 is used for threading blind or through holes in hard-to-reach areas, such as deep bores or recessed surfaces. Its extended length allows access where standard taps cannot reach. Common applications include automotive, aerospace, and general machining of steel and alloys.

What are the specifications of the OSG Extension Tap 5/16"-18 UNC?

This OSG extension tap has a 5/16"-18 UNC thread size, H3 / 2B-3B tolerance, 3-flute design, and plug chamfer. It is made from black oxide high-speed steel (HSS) for wear resistance. The manufacturer part number is 1293501. It is designed for threading ferrous materials in extended-reach applications.

Where to buy the OSG Extension Tap 1293501 worldwide?

You can source the OSG Extension Tap 1293501 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. We supply genuine OSG tooling for industrial threading needs.

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

To select the correct OSG extension tap, match the thread size (e.g., 5/16"-18 UNC), tolerance class (H3 / 2B-3B), and chamfer type (plug) to your hole requirements. Consider material hardness and tap coating—black oxide HSS suits general steel. Ensure the tap's reach length clears obstructions. Consult OSG's technical data for feed and speed recommendations.

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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