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OSG Screw Thread Insert STI Tap: Spiral Fute, 5/16"-18 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, 5/16"-18 UNC, H4 / 2B-3B, 3 Flute

The OSG Screw Thread Insert STI Tap (MPN 0146501) is a spiral-flute tap for steel and stainless steel, sized 5/16"-18 UNC with an H4 / 2B-3B tolerance and a bottoming chamfer. It features 3 flutes, designed for…

SKU 3G-OTH-244247

Brand
OSG
Item
Screw Thread Insert STI Tap: Spiral Fute, 5/16"-18 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
0146501
Type
H4 / 2B-3B, Bottoming Chamfer
Flute
3
UNC
5/16"-18
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OSG Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The OSG Screw Thread Insert STI Tap (MPN 0146501) is a spiral-flute tap for steel and stainless steel, sized 5/16"-18 UNC with an H4 / 2B-3B tolerance and a bottoming chamfer. It features 3 flutes, designed for threading holes that will accept screw thread inserts. 3G Electric interprets your demand for this precision tool, sourcing it from our global network across 14 industrial departments — with specialist depth in cutting tools and fastening solutions.

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. The spiral flute design evacuates chips upward, making it ideal for blind-hole applications. This tap produces threads that accept helical coil inserts, restoring or strengthening threaded holes in industrial components.

What are the specifications of the OSG 0146501 STI tap?

The OSG 0146501 is a screw thread insert STI tap with spiral flute, size 5/16"-18 UNC, H4 / 2B-3B tolerance, 3 flutes, and bottoming chamfer. It is designed for threading steel and stainless steel. The H4 / 2B-3B designation ensures precise fit for insert installation.

Where to buy OSG taps in worldwide?

You can source OSG 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 0146501 STI tap. We supply genuine OSG tooling for manufacturing and maintenance operations.

How to select the correct STI tap size for a 5/16"-18 UNC insert?

To select the correct STI tap for a 5/16"-18 UNC insert, use a tap marked STI with the same thread size and pitch. The OSG 0146501 is a spiral-flute STI tap with H4 / 2B-3B tolerance, designed for steel and stainless steel. Ensure the tap chamfer matches your hole type: bottoming for blind holes, plug for through holes.

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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