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OSG Screw Thread Insert STI Tap: Spiral Fute, 1/2"-20 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, 1/2"-20 UNF, H4 / 2B-3B, 4 Flute

The OSG Screw Thread Insert STI Tap (MPN 0147901) is a spiral-flute tap for steel and stainless steel, sized 1/2"-20 UNF with an H4 / 2B-3B tolerance and a bottoming chamfer. It features 4 flutes and is designed for…

SKU 3G-OTH-244187

Brand
OSG
Item
Screw Thread Insert STI Tap: Spiral Fute, 1/2"-20 UNF, H4 / 2B-3B, 4 Flute
Category
Spiral-Flute STI Taps for Steel & Stainless Steel
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Technical Specifications

OSG
Manufacturer Part Number
0147901
Type
H4 / 2B-3B, Bottoming Chamfer
Flute
4
UNF
1/2"-20
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OSG Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The OSG Screw Thread Insert STI Tap (MPN 0147901) is a spiral-flute tap for steel and stainless steel, sized 1/2"-20 UNF with an H4 / 2B-3B tolerance and a bottoming chamfer. It features 4 flutes and is designed for threading holes that will accept screw thread inserts.

Frequently Asked Questions

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

An OSG spiral-flute STI tap is used to cut internal threads in steel and stainless steel for screw thread inserts. It is designed for bottoming chamfer applications, producing threads to H4 / 2B-3B tolerance classes. This tap is ideal for repair or reinforcement work in industrial equipment.

What are the specifications of the OSG 0147901 STI tap?

The OSG 0147901 STI tap has a 1/2"-20 UNF thread size, spiral flute design, 4 flutes, and a bottoming chamfer. It is rated H4 / 2B-3B tolerance for screw thread insert applications. This tap is designed for use in steel and stainless steel materials.

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 0147901 spiral-flute STI tap.

How to select the correct OSG STI tap for steel?

To select the correct OSG STI tap for steel, match the thread size (e.g., 1/2"-20 UNF) and tolerance class (H4 / 2B-3B) to your insert requirements. Use a spiral-flute design for chip evacuation in blind holes. Ensure the tap is rated for steel and stainless steel materials.

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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