Helicoil
Helicoil 8187-10 Straight Flute Hand Tap 5/8"-11 Plug Uncoated 4 Flutes
Cuts 5/8"-11 UNC threads in through-holes using four-flute high-speed steel
- TypeHole, Drill, Bore & Wire Gauges
- Thread repair ready with 5/8"-11 UNC sizing
- Clean starts from plug chamfer design
- Durable high-speed steel construction
- Four flutes clear chips efficiently
- Uncoated finish suits general-purpose tapping
Purpose and User
The Helicoil 8187-10 is a straight flute hand tap designed to cut internal threads for screw thread inserts in a 5/8"-11 UNC size. It suits maintenance technicians and machinists who repair or create threaded holes in metal components using hand tools.
Thread Standard Limits
The tap follows a 5/8"-11 UNC thread form with an H3 thread limit and a plug chamfer. Its four-flute high-speed steel construction cuts right-hand threads to a depth of 2 inches, but the uncoated surface offers no wear resistance for abrasive or high-volume production work.
Setup Verification
Confirm the workpiece material suits uncoated high-speed steel and that the drilled hole matches the required minor diameter for a 5/8"-11 STI tap. Ensure you have a tap wrench for the 4 1/4 inch overall length and that the application tolerates a plug chamfer rather than a bottoming or taper lead.
Highlights
- Thread repair ready with 5/8"-11 UNC sizing
- Clean starts from plug chamfer design
- Durable high-speed steel construction
- Four flutes clear chips efficiently
- Uncoated finish suits general-purpose tapping
Specifications
| Brand | Helicoil |
|---|---|
| Type | Hole, Drill, Bore & Wire Gauges |
Questions about this item
Should I choose the H3 thread limit or a different limit for my 5/8"-11 UNC application?
The H3 limit is the standard class of fit for general-purpose 5/8"-11 UNC threading and matches the specification of this tap.
What does the 4-flute design mean for chip evacuation in a through-hole?
Four straight flutes provide adequate chip clearance for through-holes but can pack chips in blind holes where a spiral-flute tap would perform better.
How does the plug chamfer affect thread engagement on a 5/8"-11 UNC hole?
The plug chamfer offers a moderate lead of 3-5 threads, making it easier to start the tap straight than a bottoming chamfer while cutting full threads deeper than a taper chamfer.
Also in this aisle
People compared these
Same shelf, same checkout — eight coins and a 30-minute rate lock.
