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OSG Screw Thread Insert STI Tap: Spiral Fute, 3/8"-16 UNC, H4 / 2B-3B, 3 Flute - Spiral-Flute STI Taps for Steel & Stainless Steel
OSGSpiral-Flute STI Taps for Steel & Stainless Steel

OSG Screw Thread Insert STI Tap: Spiral Fute, 3/8"-16 UNC, H4 / 2B-3B, 3 Flute

The OSG Screw Thread Insert STI Tap (MPN 0146901) is a spiral-flute tap for steel and stainless steel, sized 3/8"-16 UNC with a bottoming chamfer and three flutes. It is ground to an H4 / 2B-3B tolerance class…

SKU 3G-OTH-244195

Brand
OSG
Item
Screw Thread Insert STI Tap: Spiral Fute, 3/8"-16 UNC, H4 / 2B-3B, 3 Flute
Category
Spiral-Flute STI Taps for Steel & Stainless Steel
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Technical Specifications

OSG
Manufacturer Part Number
0146901
Type
H4 / 2B-3B, Bottoming Chamfer
Flute
3
UNC
3/8"-16
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OSG Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The OSG Screw Thread Insert STI Tap (MPN 0146901) is a spiral-flute tap for steel and stainless steel, sized 3/8"-16 UNC with a bottoming chamfer and three flutes. It is ground to an H4 / 2B-3B tolerance class, ensuring precise thread forming for STI applications.

Frequently Asked Questions

What is an OSG Screw Thread Insert STI Tap used for?

An OSG Screw Thread Insert STI Tap cuts internal threads in steel and stainless steel for installing helical wire thread inserts. It is commonly used in automotive, aerospace, and general manufacturing to repair or reinforce tapped holes in demanding materials.

What are the specifications of the OSG STI Tap 3/8"-16 UNC?

This OSG STI Tap has a 3/8"-16 UNC thread, H4 / 2B-3B tolerance, 3 flutes, and a bottoming chamfer. It is designed for spiral-flute tapping in steel and stainless steel. The manufacturer part number is 0146901.

Where to buy OSG STI Taps worldwide?

3G Electric supplies OSG STI Taps worldwide. We handle full logistics, customs clearance, and delivery to your facility. Contact us for pricing and lead time on this 3/8"-16 UNC spiral-flute tap (MPN 0146901).

How to select the correct STI tap for thread inserts?

Select an STI tap with the same thread size and pitch as the insert, such as 3/8"-16 UNC. Use a bottoming chamfer for blind holes and a spiral-flute design for chip evacuation in steel. Match the tap tolerance (H4 / 2B-3B) to the required class of fit.

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 sti taps for steel & stainless steel. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

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