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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 0146508) is a spiral-flute tap for steel and stainless steel, sized 5/16"-18 UNC with a bottoming chamfer. It features 3 flutes and an H4 / 2B-3B tolerance class, designed for…

SKU 3G-OTH-244378

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
0146508
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 0146508) is a spiral-flute tap for steel and stainless steel, sized 5/16"-18 UNC with a bottoming chamfer. It features 3 flutes and an H4 / 2B-3B tolerance class, designed for threading holes that will accept screw thread inserts.

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 accepting helical wire thread inserts. It is commonly applied in automotive, aerospace, and general manufacturing where thread repair or reinforcement is needed.

What are the specifications of the OSG STI Tap 0146508?

The OSG STI Tap has a UNC thread size of 5/16"-18, a tolerance class of H4 / 2B-3B, a bottoming chamfer, and 3 spiral flutes. It is designed for tapping steel and stainless steel. The manufacturer part number is 0146508.

Where to buy OSG STI Tap 0146508 worldwide?

You can source the OSG STI Tap 0146508 through 3G Electric, a global industrial equipment distributor. We handle full logistics, customs clearance, and delivery to worldwide destinations, ensuring you receive the correct tap for your threading application.

How to select the correct OSG STI tap for thread inserts?

Select an OSG STI tap based on the thread size and tolerance required for the insert. For steel and stainless steel, use a spiral-flute tap with a bottoming chamfer for blind holes. Ensure the tap tolerance matches the insert class, such as H4 / 2B-3B for standard fits.

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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