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OSG Screw Thread Insert STI Tap: Spiral Fute, 5/8"-18 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, 5/8"-18 UNF, H4 / 2B-3B, 4 Flute

The OSG Screw Thread Insert STI Tap (MPN 30204301) is a spiral-flute tap for steel and stainless steel, sized 5/8"-18 UNF with a bottoming chamfer. It features 4 flutes and an H4 / 2B-3B tolerance class, designed for…

SKU 3G-OTH-244246

Brand
OSG
Item
Screw Thread Insert STI Tap: Spiral Fute, 5/8"-18 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
30204301
Type
H4 / 2B-3B, Bottoming Chamfer
Flute
4
UNF
5/8"-18
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OSG Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The OSG Screw Thread Insert STI Tap (MPN 30204301) is a spiral-flute tap for steel and stainless steel, sized 5/8"-18 UNF with a bottoming chamfer. It features 4 flutes and an H4 / 2B-3B tolerance class, designed for threading holes to 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. The spiral-flute design evacuates chips upward, making it ideal for blind-hole applications. This bottoming-chamfer tap (MPN 30204301) threads close to the hole bottom, ensuring full insert engagement.

What are the specifications of the OSG STI tap 30204301?

The OSG STI tap (MPN 30204301) has a UNF thread size of 5/8"-18, with a H4 / 2B-3B tolerance class. It features 4 spiral flutes and a bottoming chamfer, designed for cutting threads in steel and stainless steel. The H4 limit ensures proper fit for STI inserts.

Where to buy OSG taps in worldwide?

3G Electric supplies OSG taps worldwide, including the spiral-flute STI tap 30204301. We handle full logistics, customs clearance, and delivery to your site. Contact us for availability and lead time. As a global industrial distributor since 1990, we source and deliver genuine OSG tooling to any country.

How to select the correct OSG STI tap for steel?

Select an OSG STI tap based on thread size, pitch, and material. For steel and stainless steel, use a spiral-flute design with a bottoming chamfer for blind holes. The H4 / 2B-3B tolerance ensures proper fit for STI inserts. Verify the tap's UNF size (e.g., 5/8"-18) matches your insert and hole requirements.

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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