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OSG Screw Thread Insert STI Tap: Spiral Fute, 7/8"-9 UNC, H5 / 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, 7/8"-9 UNC, H5 / 2B-3B, 4 Flute

The OSG Screw Thread Insert STI Tap is a spiral-flute tap for steel and stainless steel, specified as 7/8"-9 UNC with an H5 / 2B-3B tolerance, 4 flutes, and a bottoming chamfer (MPN 30205501). 3G Electric sources…

SKU 3G-OTH-244226

Brand
OSG
Item
Screw Thread Insert STI Tap: Spiral Fute, 7/8"-9 UNC, H5 / 2B-3B, 4 Flute
Category
Spiral-Flute STI Taps for Steel & Stainless Steel
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Technical Specifications

OSG
Manufacturer Part Number
30205501
Type
H5 / 2B-3B, Bottoming Chamfer
Flute
4
UNC
7/8"-9
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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 7/8"-9 UNC with an H5 / 2B-3B tolerance, 4 flutes, and a bottoming chamfer (MPN 30205501). 3G Electric sources this genuine OSG tool across 14 industrial departments, with specialist expertise in combustion, pumps, and controls ensuring accurate fulfillment.

Frequently Asked Questions

What is the OSG 30205501 STI tap used for?

The OSG 30205501 is a spiral-flute STI tap designed for cutting internal threads in steel and stainless steel. It is used to prepare holes for screw thread inserts, ensuring strong, wear-resistant threads in demanding industrial applications.

What are the specifications of the OSG 30205501 STI tap?

This OSG tap has a UNC thread size of 7/8"-9, with an H5 / 2B-3B tolerance class. It features 4 flutes and a bottoming chamfer for threading to the bottom of blind holes. The manufacturer part number is 30205501.

Where to buy the OSG 30205501 STI tap worldwide?

You can source the OSG 30205501 STI tap through 3G Electric, a global industrial equipment distributor. We handle full logistics, customs clearance, and delivery to worldwide destinations, ensuring reliable supply for your operations.

How to select the correct STI tap for steel?

For steel, choose an STI tap like the OSG spiral-flute design, which efficiently evacuates chips. Match the tap's thread size (e.g., 7/8"-9 UNC) and tolerance (H5) to your insert requirements. Use a bottoming chamfer for blind holes and ensure proper lubrication during threading.

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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