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OSG Screw Thread Insert STI Tap: Straight Fute, 7/16"-20 UNF, H3 / 2B-3B, 4 Flute - General Purpose STI Taps
OSGGeneral Purpose STI Taps

OSG Screw Thread Insert STI Tap: Straight Fute, 7/16"-20 UNF, H3 / 2B-3B, 4 Flute

The OSG Screw Thread Insert STI Tap (SKU 33ZK95, MPN 1813400) is a general-purpose STI tap with a straight flute design, sized 7/16"-20 UNF. It features an H3 / 2B-3B tolerance, 4 flutes, and a plug chamfer, making…

SKU 3G-OTH-262113

Brand
OSG
Item
Screw Thread Insert STI Tap: Straight Fute, 7/16"-20 UNF, H3 / 2B-3B, 4 Flute
Category
General Purpose STI Taps
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Technical Specifications

OSG
Manufacturer Part Number
1813400
Type
H3 / 2B-3B, Plug Chamfer
Flute
4
UNF
7/16"-20
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OSG Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The OSG Screw Thread Insert STI Tap (SKU 33ZK95, MPN 1813400) is a general-purpose STI tap with a straight flute design, sized 7/16"-20 UNF. It features an H3 / 2B-3B tolerance, 4 flutes, and a plug chamfer, making it suitable for threading applications requiring screw thread inserts.

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 metal or plastic before installing a helical wire thread insert. It is commonly applied in aerospace, automotive, and general manufacturing where thread repair or reinforcement is needed. The 7/16"-20 UNF size suits standard unified fine thread applications.

What are the specifications of the OSG STI Tap MPN 1813400?

This OSG STI Tap has a 7/16"-20 UNF thread size, H3 / 2B-3B tolerance, 4 flutes, and a plug chamfer. It is a straight flute, general-purpose tap designed for screw thread insert installation. The manufacturer part number is 1813400, and the SKU is 33ZK95.

Where to buy OSG STI Taps worldwide?

You can source OSG STI Taps, including MPN 1813400, through 3G Electric. As a global industrial equipment distributor since 1990, 3G Electric handles full logistics, customs clearance, and delivery to worldwide destinations. Contact us for availability and lead time on this and other OSG threading tools.

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

Select an OSG STI Tap based on the thread insert's size and tolerance. For a 7/16"-20 UNF insert, use a tap with matching thread pitch and an H3 / 2B-3B tolerance class. Ensure the tap has a plug chamfer for general through-hole work. Always match the tap to the insert manufacturer's recommendations for proper thread fit.

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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