HELI-COIL Screw Thread Insert STI Tap: Straight Fute, 1 1/8"-7 UNC, H4 / 3B, 4 Flute
The HELI-COIL Screw Thread Insert STI Tap (Straight Flute) is a general-purpose STI tap designed for 1 1/8"-7 UNC threads, with an H4 / 3B tolerance and plug chamfer. It features 4 flutes and is manufactured under…
SKU 3G-OTH-261981
Also listed as: 818718 · 8187 18
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 (Straight Flute) is a general-purpose STI tap designed for 1 1/8"-7 UNC threads, with an H4 / 3B tolerance and plug chamfer. It features 4 flutes and is manufactured under part number 8187-18. 3G Electric interprets demand and delivers this genuine industrial tool across 14 departments, with specialist depth in combustion, pumps and controls as an authorised distributor.
Frequently Asked Questions
What is the HELI-COIL Screw Thread Insert STI Tap used for?
This STI tap is designed to cut internal threads for HELI-COIL screw thread inserts in metalworking applications. It is commonly used in automotive, aerospace, and industrial maintenance to repair or reinforce stripped threads, ensuring strong, wear-resistant connections in components like engine blocks and machinery housings.
What are the specifications of the HELI-COIL STI Tap 8187-18?
The HELI-COIL STI Tap (MPN 8187-18) has a UNC thread size of 1 1/8"-7, with H4 / 3B tolerance and a plug chamfer. It features 4 straight flutes and is designed for general-purpose thread insert installation. This tap is manufactured by HELI-COIL for use with their screw thread inserts.
Where to buy the HELI-COIL STI Tap 8187-18 worldwide?
3G Electric supplies the HELI-COIL STI Tap 8187-18 to customers worldwide. As a global industrial equipment distributor since 1990, we handle full logistics, customs clearance, and delivery to your location. Contact us for availability and lead time on this precision threading tool.
How to select the correct STI tap for HELI-COIL inserts?
Select an STI tap that matches the insert's thread size and class. For this HELI-COIL tap, use it with 1 1/8"-7 UNC inserts requiring a 4-flute, plug chamfer design. Ensure the tap's H4 / 3B tolerance aligns with your application's thread fit requirements. Always follow the insert manufacturer's recommended drilling and tapping procedures.
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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.
