HELI-COIL Screw Thread Insert STI Tap: Straight Fute, 1/4"-28 UNF, H2 / 3B, 3 Flute
The HELI-COIL Screw Thread Insert STI Tap is a straight flute, general-purpose tap designed for installing HELI-COIL screw thread inserts. This 1/4"-28 UNF tap features an H2 / 3B tolerance class, a plug chamfer, and…
SKU 3G-OTH-262006
Also listed as: 4 FPB · 4-FPB
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 straight flute, general-purpose tap designed for installing HELI-COIL screw thread inserts. This 1/4"-28 UNF tap features an H2 / 3B tolerance class, a plug chamfer, and 3 flutes (MPN 4FPB).
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 assemblies. It is used across machining, automotive, and industrial maintenance to restore or reinforce stripped threads in components like engine blocks, pumps, and housings.
What are the specifications of the HELI-COIL 4FPB STI tap?
The HELI-COIL 4FPB is a general-purpose STI tap with 1/4"-28 UNF thread, H2 / 3B tolerance, 3 straight flutes, and a plug chamfer. It is designed for use with HELI-COIL screw thread inserts to produce Class 3B internal threads.
Where to buy HELI-COIL STI taps for worldwide delivery?
3G Electric supplies HELI-COIL STI taps like the 4FPB to customers worldwide. We handle full logistics, customs clearance, and delivery to your site. Contact us for pricing and lead time on this and other industrial tooling needs.
How to select the correct STI tap for a thread repair job?
Match the STI tap to the insert's thread size and pitch, such as 1/4"-28 UNF. Use a plug chamfer for through holes or blind holes with sufficient depth. Ensure the tap tolerance (H2 / 3B) aligns with the required thread class for the application.
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.
