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OSG Screw Thread Insert STI Tap: Spiral Fute, 7/8"-14 UNF, H4 / 2B-3B, 4 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, 7/8"-14 UNF, H4 / 2B-3B, 4 Flute

SKU 3G-OTH-244260

Brand
OSG
Item
Screw Thread Insert STI Tap: Spiral Fute, 7/8"-14 UNF, H4 / 2B-3B, 4 Flute
Category
Spiral-Flute STI Taps for Steel & Stainless Steel
Available to Order
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Technical Specifications

OSG
Manufacturer Part Number
0148308
Type
H4 / 2B-3B, Bottoming Chamfer
Flute
4
UNF
7/8"-14
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OSG Products
3G Electric (S) Pte. Ltd. — Singapore

Frequently Asked Questions

What is an OSG spiral-flute STI tap used for?

An OSG spiral-flute STI tap cuts internal threads in steel and stainless steel for screw thread inserts. It is used in aerospace, automotive, and industrial maintenance to restore or reinforce threaded holes. The spiral-flute design evacuates chips upward, making it ideal for blind-hole applications.

What are the specifications of the OSG STI tap 0148308?

The OSG STI tap 0148308 has a UNF thread size of 7/8"-14, H4 / 2B-3B tolerance, 4 flutes, and a bottoming chamfer. It is designed for screw thread inserts in steel and stainless steel. The H4 tolerance ensures precise thread fit for insert installation.

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. As a global industrial solutions provider, we source genuine OSG cutting tools and support procurement teams with technical guidance on thread insert tapping applications.

How to select the correct STI tap for a thread repair?

Select an STI tap that matches the original thread size and pitch, such as 7/8"-14 UNF. Use a bottoming chamfer for blind holes and a spiral-flute design for chip evacuation in steel. Verify the tap tolerance (e.g., H4) matches the insert class. OSG taps are a reliable choice for consistent results.

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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