Helicoil
Helicoil 5FPB Straight Flute Hand Tap 5/16-24 Plug Uncoated 4 Flutes
Cuts UNF 5/16"-24 threads in through-holes with a four-flute HSS plug tap
- TypeHole, Drill, Bore & Wire Gauges
- Designed for 5/16-24 UNF threads
- High-speed steel resists wear during tapping
- Four flutes improve chip evacuation
- Plug chamfer starts threads cleanly
- Bright uncoated finish suits general use
Helicoil 5/16-24 UNF Straight Flute Hand Tap
This Helicoil 5FPB tap cuts internal threads for 5/16 inch UNF screw thread inserts. It is made from high speed steel with a bright uncoated finish and features a right hand thread direction. The plug chamfer design suits general purpose through hole or blind hole threading tasks. Four straight flutes provide standard chip evacuation during hand tapping operations.
Thread Size 5/16 Inch -24 UNF STI
The critical specification is the 5/16 inch -24 UNF thread size designated for screw thread insert applications. This tap creates the specific oversized hole required to accept a Helicoil wire insert rather than a standard bolt. Using it for conventional threading will produce incorrect pitch diameter and compromise fastener fit. Verify the insert size before selecting this tool.
For Thread Repair and Insert Installation
Mechanics and engineers repairing stripped threads or installing wire inserts in aluminium or steel components will use this tap. It suits workshop thread restoration where STI holes are specified. Builders needing standard 5/16-24 UNF taps for direct bolting should look elsewhere. The uncoated high speed steel limits tool life in abrasive or high volume production environments.
Highlights
- Designed for 5/16-24 UNF threads
- High-speed steel resists wear during tapping
- Four flutes improve chip evacuation
- Plug chamfer starts threads cleanly
- Bright uncoated finish suits general use
Specifications
| Brand | Helicoil |
|---|---|
| Type | Hole, Drill, Bore & Wire Gauges |
Questions about this item
What does the 5/16-24 thread size mean for the holes I will tap?
The tap cuts a 5/16 inch diameter hole with 24 threads per inch using a UNF fine-pitch standard, producing internal threads that accept matching UNF fasteners.
How does the H2 thread limit affect the fit of the finished threads?
The H2 limit sets a specific pitch-diameter tolerance band, giving a standard class of fit for general-purpose UNF threading in materials such as steel or aluminium.
What shank and square dimensions does the 2 15/16 inch overall length tap need in a holder?
The tap follows standard USCTI dimensions for a 5/16 inch UNF hand tap, so a matching tap wrench or adjustable holder sized for that series will grip the shank and drive square correctly.
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