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OSG Screw Thread Insert STI Tap: Spiral Fute, 3/4"-16 UNF, H4 / 2B-3B, 4 Flute - Spiral-Flute STI Taps
OSGSpiral-Flute STI Taps

OSG Screw Thread Insert STI Tap: Spiral Fute, 3/4"-16 UNF, H4 / 2B-3B, 4 Flute

The OSG Screw Thread Insert STI Tap (SKU 33ZF28, MPN 10801900) is a spiral-flute tap for 3/4"-16 UNF threads, featuring a bottoming chamfer and 4 flutes. It is ground to an H4 / 2B-3B tolerance class, ensuring…

SKU 3G-OTH-273377

Brand
OSG
Item
Screw Thread Insert STI Tap: Spiral Fute, 3/4"-16 UNF, H4 / 2B-3B, 4 Flute
Category
Spiral-Flute STI Taps
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Technical Specifications

OSG
Manufacturer Part Number
10801900
Type
H4 / 2B-3B, Bottoming Chamfer
Flute
4
UNF
3/4"-16
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OSG Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The OSG Screw Thread Insert STI Tap (SKU 33ZF28, MPN 10801900) is a spiral-flute tap for 3/4"-16 UNF threads, featuring a bottoming chamfer and 4 flutes. It is ground to an H4 / 2B-3B tolerance class, ensuring precise thread fit for STI inserts.

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 a workpiece to accept a helical coil thread insert. It is used in industrial maintenance and production applications where a stripped or worn thread must be restored or reinforced, particularly in softer materials like aluminum.

What are the specifications of the OSG 3/4"-16 UNF STI Tap?

This OSG STI tap has a 3/4"-16 UNF thread, H4 / 2B-3B tolerance, 4 flutes, and a bottoming chamfer. It is a spiral-flute design for chip evacuation in blind holes. The manufacturer part number is 10801900.

Where to buy OSG STI Taps worldwide?

3G Electric supplies OSG STI Taps worldwide. We source genuine industrial tooling across 14 departments and handle full logistics, customs clearance, and delivery to your facility. Contact us for availability and lead time on the OSG 3/4"-16 UNF spiral-flute tap.

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

Select an STI tap that matches the original thread size and pitch, such as 3/4"-16 UNF. The tap must be marked for screw thread insert use (STI). Use a bottoming chamfer for blind holes and a spiral flute for chip clearance. Always verify the insert manufacturer's recommended drill size.

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. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

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