Send a part number, a photo, or a whole BOM — we supply it and stand behind it. EXW Singapore — collect from our office.

3G Electric
HELI-COIL General Purpose STI Tap, 9/16"-12 UNC, H3/3B, Plug Chamfer, 4 Flute - General Purpose STI Taps
HELI-COILGeneral Purpose STI Taps

HELI-COIL General Purpose STI Tap, 9/16"-12 UNC, H3/3B, Plug Chamfer, 4 Flute

<p>The HELI-COIL General Purpose STI Tap (MPN 187-9) is engineered for precision thread repair and installation in industrial applications. This tap is specifically designed for use with HELI-COIL inserts, ensuring…

SKU 3G-OTH-262041

Also listed as: 1879 · 187 9

Brand
HELI-COIL
Item
General Purpose STI Tap, 9/16"-12 UNC, H3/3B, Plug Chamfer, 4 Flute
Part Number
187-9
Category
General Purpose STI Taps
Available to Order
Also known as:187-9HELI-COIL
Trade pricing by quote — replies within 24h
Qty
WhatsApp an engineerMessage via Telegram
No account needed — your quote request goes straight to our engineers. A free account lets you track quotes and re-order faster.
EXW Singapore
Collect or forward from our office
Datasheet on Request
Technical specs
1-Day Quote
Replies within 24h

Local availability & support — Singapore

Local office
20 Woodlands Link #09-05, Singapore 738733
Phone
+65 8878 8355
Delivery
Same-day or next-business-day delivery within Singapore for in-stock items; 7–14 days for factory-order parts from Europe.
Payment
Invoicing in SGD. PayNow, bank transfer, and corporate PO accepted.
Ships to
Singapore

Technical Specifications

HELI-COIL
Manufacturer Part Number
187-9
Type
H3 / 3B, Plug Chamfer
Flute
4
UNC
9/16"-12

Technical Documents

No technical documents available for this product.
Request documentation →
Not sure this is the right part? Get a recommendation.

Need installation or engineering help?

Installation, commissioning, maintenance plans, system design, and bundled product + service quotes — one team handles the full scope.
Talk to an engineer

Ask a question

HELI-COIL Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

<p>The HELI-COIL General Purpose STI Tap (MPN 187-9) is engineered for precision thread repair and installation in industrial applications. This tap is specifically designed for use with HELI-COIL inserts, ensuring accurate and reliable threads. Key specifications include a 9/16";-12 UNC thread size, H3/3B tolerance class, plug chamfer, and 4-flute design for efficient chip evacuation. Ideal for maintenance, repair, and production environments across aerospace, automotive, and general manufacturing sectors.</p><p>As a Singapore-based supplier, 3G Electric offers this tap with worldwide shipping, SGD quotes on request, and GST handled for local buyers. Enjoy fast delivery across Singapore and Southeast Asia, making it convenient to source this essential tool for your operations.</p>

Frequently Asked Questions

What are the key specifications of the HELI-COIL STI Tap 187-9?

The tap has a 9/16";-12 UNC thread size, H3/3B tolerance class, plug chamfer, and 4 flutes. It is a General Purpose STI Tap designed for use with HELI-COIL inserts.

Can I get a quote in SGD and what about delivery in Singapore?

Yes, 3G Electric provides SGD quotes on request. For Singapore buyers, GST is handled, and we offer fast delivery across Singapore and Southeast Asia.

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.
Not sure this is the right part? Photo-identify it→

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.

You might also need

Burners & Combustion →Pumps & Compressors →Spare Parts →All Products →

More from HELI-COIL

View all HELI-COIL parts →
Straight flute STI tap for 7/16"-20 UNF threads with H3 / 3B tolerance and plug chamfer. Features 4 flutes for chip evacuation. Used to cut threads for installing screw thread inserts in applications such as repairing or strengthening threads in materials like aluminum and cast iron
HELI-COIL
Straight flute STI tap for 7/16"-20 UNF threads with H3 / 3B tolerance and plug chamfer. Features 4 flutes for chip evacuation. Used to cut threads for installing screw thread inserts in applications such as repairing or strengthening threads in materials like aluminum and cast iron
This general purpose STI tap cuts internal threads for installing screw thread inserts. It features a 4-flute straight flute design and is rated H3 / 4H tolerance. Suitable for thread repair and reinforcement in metal components
HELI-COIL
This general purpose STI tap cuts internal threads for installing screw thread inserts. It features a 4-flute straight flute design and is rated H3 / 4H tolerance. Suitable for thread repair and reinforcement in metal components
This STI tap is designed for cutting internal threads in pre-drilled holes prior to installing screw thread inserts. It features a 1 1/4"-12 UNF thread, H4 / 3B tolerance, plug chamfer, and 6 straight flutes. Commonly used in automotive, aerospace, and industrial maintenance for thread repair or reinforcement in metal components
HELI-COIL
This STI tap is designed for cutting internal threads in pre-drilled holes prior to installing screw thread inserts. It features a 1 1/4"-12 UNF thread, H4 / 3B tolerance, plug chamfer, and 6 straight flutes. Commonly used in automotive, aerospace, and industrial maintenance for thread repair or reinforcement in metal components
HELI-COIL Screw Thread Insert STI Tap: Straight Fute, 1/4"-28 UNF, H2 / 3B, 3 Flute, Plug Chamfer (MPN 4FPB)
HELI-COIL
HELI-COIL Screw Thread Insert STI Tap: Straight Fute, 1/4"-28 UNF, H2 / 3B, 3 Flute, Plug Chamfer (MPN 4FPB)
HELI-COIL Screw Thread Insert STI Tap: Straight Fute, M5x0.8 Metric, D7 / 4H, 3 Flute, Plug Chamfer (MPN 4687-5)
HELI-COIL
HELI-COIL Screw Thread Insert STI Tap: Straight Fute, M5x0.8 Metric, D7 / 4H, 3 Flute, Plug Chamfer (MPN 4687-5)

Customer reviews

No reviews yet — be the first

Questions & answers

No questions yet — ask us the first