HELI-COILGeneral Purpose STI Taps

HELI-COIL General Purpose STI Tap, 3/4"-10 UNC, H5 / 2B, Plug Chamfer, 4 Flute

The HELI-COIL Screw Thread Insert STI Tap (Straight Flute, MPN 18187-12) is a general-purpose tap for 3/4"-10 UNC threads, with H5 / 2B tolerance and a plug chamfer. It features 4 flutes and is designed for use with…

SKU 3G-OTH-262096

Also listed as: 1818712 · 18187 12

Brand

HELI-COIL

Item

General Purpose STI Tap, 3/4"-10 UNC, H5 / 2B, Plug Chamfer, 4 Flute

Part Number

18187-12

Local availability & support — Singapore

Local office: 20 Woodlands Link #09-05, Singapore 738733
Phone: +65 8878 8355
Payment: Invoicing in SGD. PayNow, bank transfer, and corporate PO accepted.

Technical Specifications

HELI-COIL

Manufacturer Part Number

18187-12 

Type

H5 / 2B, Plug Chamfer 

Flute

4

UNC

3/4"-10 

Technical Documents

No technical documents available for this product.

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HELI-COIL Products

3G Electric (S) Pte. Ltd. — Singapore

Product Description

Frequently Asked Questions

What is a HELI-COIL STI tap used for?

A HELI-COIL STI tap cuts threads for installing screw thread inserts in metal parts. It is used in automotive, aerospace, and industrial maintenance to repair stripped threads or strengthen threaded holes in softer materials like aluminum.

What are the specifications of the HELI-COIL 18187-12 STI tap?

This HELI-COIL STI tap has a 3/4"-10 UNC thread, H5 / 2B tolerance, 4 flutes, and a plug chamfer. It is designed for general-purpose thread repair and insert installation in industrial applications.

Where to buy HELI-COIL STI taps worldwide?

3G Electric supplies HELI-COIL STI taps worldwide. We handle full logistics, customs clearance, and delivery to your facility. Contact us for pricing and lead time on this 3/4"-10 UNC tap (MPN 18187-12).

How to select the correct STI tap for a thread repair?

Match the STI tap size to the insert's thread specification. For a 3/4"-10 UNC insert, use a 3/4"-10 STI tap with H5 tolerance. Ensure the tap has a plug chamfer for through-hole repairs and use cutting fluid for clean threads.

Used in

Common applications for HELI-COIL

Aerospace — Tangless screw-locking HELI-COIL inserts in 18-8 stainless steel for vibration-resistant threaded joints in airframe and engine components.

Automotive — Free-running tanged HELI-COIL inserts in metric sizes for repairing stripped threads in aluminum engine blocks and transmission housings.

Industrial machinery — STI taps and prewinder installation tools for on-site repair of threaded holes in cast iron and steel machine frames.

Oil and gas — Nitronic 60 HELI-COIL inserts for galling resistance in stainless steel valve bodies and pump housings exposed to corrosive media.

MRO and maintenance — HELI-COIL thread repair kits containing inserts, drill, tap, and installation tool for restoring damaged threads without replacing the parent component.

Electrical equipment — Screw-locking tangless HELI-COIL inserts for securing fasteners in metal enclosures and control panels subject to vibration.

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HELI-COIL Products

3G Electric supplies HELI-COIL 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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