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OSG Extension Tap: 3/8"-16 UNC, H3 / 2B-3B, 4 Flute, Plug Chamfer - Pulley Taps
OSGPulley Taps

OSG Extension Tap: 3/8"-16 UNC, H3 / 2B-3B, 4 Flute, Plug Chamfer

The OSG Extension Tap (MPN 1291201) is a 3/8"-16 UNC pulley tap with a black oxide high-speed steel construction, H3 / 2B-3B tolerance, plug chamfer, and 4 flutes. 3G Electric interprets demand and delivers this…

SKU 3G-OTH-308207

Brand
OSG
Item
Extension Tap: 3/8"-16 UNC, H3 / 2B-3B, 4 Flute, Plug Chamfer
Category
Pulley Taps
Available to Order
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Technical Specifications

OSG
Manufacturer Part Number
1291201
Type
H3 / 2B-3B, Plug Chamfer, Black Oxide High Speed Steel
Flute
4
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OSG Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The OSG Extension Tap (MPN 1291201) is a 3/8"-16 UNC pulley tap with a black oxide high-speed steel construction, H3 / 2B-3B tolerance, plug chamfer, and 4 flutes. 3G Electric interprets demand and delivers this genuine industrial tool across 14 departments, with specialist depth in combustion, pumps, and controls as an authorized distributor.

Frequently Asked Questions

What is the OSG Extension Tap 3/8"-16 UNC used for?

The OSG Extension Tap is used for threading blind or through holes in hard-to-reach areas, such as pulley assemblies and engine blocks. Its extended length allows access where standard taps cannot reach. The plug chamfer and 4-flute design help start threads easily and clear chips efficiently.

What are the specifications of the OSG Extension Tap 1291201?

This OSG extension tap has a 3/8"-16 UNC thread size with an H3 / 2B-3B tolerance class. It features 4 flutes, a plug chamfer, and is made from black oxide high-speed steel. The manufacturer part number is 1291201, and it is classified as a pulley tap.

Where to buy the OSG Extension Tap 3/8"-16 UNC worldwide?

You can source the OSG Extension Tap 3/8"-16 UNC worldwide through 3G Electric. We handle full logistics, customs clearance, and delivery to global destinations. Contact us for availability and lead time; we supply genuine OSG taps for industrial threading applications.

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

To select the correct OSG extension tap, match the thread size (e.g., 3/8"-16 UNC) and tolerance class (H3 / 2B-3B) to your hole requirements. Choose a plug chamfer for blind holes or a taper chamfer for through holes. Ensure the tap length provides adequate reach for your workpiece.

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.

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