HELI-COIL General Purpose STI Tap, 1 1/4"-7 UNC, H4 / 3B, Plug Chamfer, 4 Flutes
The HELI-COIL Screw Thread Insert STI Tap is a general-purpose tap with a straight flute design, specified as 1 1/4"-7 UNC, H4 / 3B tolerance, 4 flutes, and a plug chamfer (MPN 8187-20). This tool is engineered for…
SKU 3G-OTH-262032
Also listed as: 818720 · 8187 20
Local availability & support
- Delivery
- Worldwide DHL shipping from Singapore; 7–14 business days door-to-door for most destinations.
- Payment
- Invoicing in USD. Bank transfer (SWIFT) and corporate PO accepted.
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Product Description
The HELI-COIL Screw Thread Insert STI Tap is a general-purpose tap with a straight flute design, specified as 1 1/4"-7 UNC, H4 / 3B tolerance, 4 flutes, and a plug chamfer (MPN 8187-20). This tool is engineered for installing HELI-COIL screw thread inserts, ensuring accurate thread formation in industrial applications.
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 add durable threads in softer materials like aluminum.
What are the specifications of the HELI-COIL STI tap 8187-20?
This HELI-COIL STI tap has a 1 1/4"-7 UNC thread, H4 / 3B tolerance, 4 flutes, and a plug chamfer. It is a general-purpose tap designed for straight-flute thread cutting before inserting HELI-COIL inserts.
Where to buy HELI-COIL STI taps worldwide?
3G Electric supplies HELI-COIL STI taps worldwide. We handle full logistics and customs clearance to deliver this 8187-20 tap to your facility. Contact us for pricing and lead time on this and other industrial tooling.
How to select the correct STI tap for a thread repair?
Match the STI tap to the insert size and thread class. For a 1 1/4"-7 UNC insert, use a tap with H4 / 3B tolerance and plug chamfer. Always verify the tap matches the insert manufacturer's recommendations for proper thread engagement.
Used in
Common applications for HELI-COILHELI-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.
