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OSG Screw Thread Insert STI Tap: Straight Fute, #4-40 UNC, H2 / 2B-3B, 3 Flute - General Purpose STI Taps
OSGGeneral Purpose STI Taps

OSG Screw Thread Insert STI Tap: Straight Fute, #4-40 UNC, H2 / 2B-3B, 3 Flute

The OSG Screw Thread Insert STI Tap (Straight Flute) is a general-purpose STI tap for #4-40 UNC threads, featuring a H2 / 2B-3B tolerance class, 3 flutes, and a bottoming chamfer (MPN 1804100).

SKU 3G-OTH-262092

Brand
OSG
Item
Screw Thread Insert STI Tap: Straight Fute, #4-40 UNC, H2 / 2B-3B, 3 Flute
Category
General Purpose STI Taps
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Technical Specifications

OSG
Manufacturer Part Number
1804100
Type
#4-40 UNC, H2 / 2B-3B, Bottoming Chamfer
Flute
3
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OSG Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The OSG Screw Thread Insert STI Tap (Straight Flute) is a general-purpose STI tap for #4-40 UNC threads, featuring a H2 / 2B-3B tolerance class, 3 flutes, and a bottoming chamfer (MPN 1804100).

Frequently Asked Questions

What is the OSG Screw Thread Insert STI Tap used for?

The OSG Screw Thread Insert STI Tap is used to cut internal threads in pre-drilled holes for installing helical wire thread inserts. It is commonly applied in aerospace, automotive, and general manufacturing to repair or reinforce threads in aluminum, steel, and other materials.

What are the specifications of the OSG STI Tap #4-40 UNC?

This OSG STI Tap has a #4-40 UNC thread size, H2 / 2B-3B tolerance, 3 flutes, and a bottoming chamfer. It is a straight flute, general purpose tap designed for screw thread insert installation. The manufacturer part number is 1804100.

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 1804100 tap.

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

Select an OSG STI Tap that matches the thread size and pitch of the insert, such as #4-40 UNC. Use a bottoming chamfer for blind holes and a plug chamfer for through holes. Ensure the tap tolerance (H2 / 2B-3B) aligns with the required thread class for the insert.

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 general purpose sti taps. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

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