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OSG Screw Thread Insert STI Tap: Spiral Fute, #4-40 UNC, H2 / 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, #4-40 UNC, H2 / 2B-3B, 3 Flute

The OSG Screw Thread Insert STI Tap is a spiral-flute tap for steel and stainless steel, specified as #4-40 UNC with H2 / 2B-3B tolerance and a bottoming chamfer. It features 3 flutes (MPN 0144808). 3G Electric…

SKU 3G-OTH-244252

Brand
OSG
Item
Screw Thread Insert STI Tap: Spiral Fute, #4-40 UNC, H2 / 2B-3B, 3 Flute
Category
Spiral-Flute STI Taps for Steel & Stainless Steel
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Technical Specifications

OSG
Manufacturer Part Number
0144808
Type
#4-40 UNC, H2 / 2B-3B, Bottoming Chamfer
Flute
3
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OSG Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The OSG Screw Thread Insert STI Tap is a spiral-flute tap for steel and stainless steel, specified as #4-40 UNC with H2 / 2B-3B tolerance and a bottoming chamfer. It features 3 flutes (MPN 0144808). 3G Electric interprets demand and supplies this genuine industrial tool across 14 departments, with specialist depth in combustion, pumps and controls as an authorised distributor.

Frequently Asked Questions

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

An OSG Screw Thread Insert STI Tap is used to cut internal threads in steel and stainless steel for installing helical coil thread inserts. It is commonly applied in aerospace, automotive, and industrial maintenance to repair or reinforce stripped threads without replacing the parent component.

What are the specifications of the OSG STI Tap #4-40 UNC?

The OSG STI Tap has a #4-40 UNC thread size, H2 / 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 0144808. OSG is the OEM brand for this precision tap.

Where to buy OSG STI Taps worldwide?

You can source OSG STI Taps worldwide through 3G Electric, a global industrial equipment distributor. We handle full logistics, customs clearance, and delivery to your location. Contact us for availability and lead time on the OSG #4-40 UNC STI Tap (MPN 0144808).

How to select the correct STI tap for thread inserts?

Select an STI tap that matches the thread insert size and material. For steel and stainless steel, use a spiral-flute tap like the OSG #4-40 UNC with bottoming chamfer for blind holes. Ensure the tap tolerance (H2 / 2B-3B) aligns with the insert class. Always follow the insert manufacturer's drilling and tapping 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-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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