Cleveland
Cleveland C58571 Spiral Flute Tap 5/16-18 UNC 3 Flutes H3
A spiral-flute tap cuts 5/16-18 UNC threads in blind holes using three flutes and H3 limits
- TypeTaps
- Right-hand threading matches standard fasteners
- 5/16-18 UNC size fits common coarse threads
- Three-flute design clears chips in blind holes
- High-speed steel construction resists wear during tapping
- H3 limit meets Class 2B fit requirements
5/16-18 UNC Spiral Flute Tap
This Cleveland spiral flute tap cuts 5/16-18 UNC threads in through-holes and blind holes. It is made from high-speed steel with a bright, uncoated finish. The H3 thread limit produces a class 2B fit. Three flutes provide chip evacuation in a right-hand thread direction.
Bottoming Chamfer and Chip Evacuation
The bottoming chamfer lets the tap start threads close to the bottom of a blind hole. Spiral flutes pull chips upward and out of the hole during cutting. Use the specified 75 percent thread drill size F to prepare the hole before tapping. Proper lubrication reduces the risk of tap breakage.
Verify Hole Size and Material Compatibility
Check that your drill bit matches the 75 percent thread drill size F before ordering. Confirm the workpiece material is suitable for an uncoated high-speed steel tap. Ensure your tapping handle or machine can accommodate the overall length of 2 23/32 inches.
Highlights
- Right-hand threading matches standard fasteners
- 5/16-18 UNC size fits common coarse threads
- Three-flute design clears chips in blind holes
- High-speed steel construction resists wear during tapping
- H3 limit meets Class 2B fit requirements
Specifications
| Brand | CLEVELAND |
|---|---|
| Type | Taps |
Questions about this item
How do I confirm the Cleveland C58571 tap is cutting correctly after I start the hole?
Check that the spiral flutes pull chips upward and out of the blind hole while the 3-flute design produces a clean 5/16-18 UNC thread to the 2B class of fit.
What comes with the C58571 tap and what must I supply separately?
The box contains the high-speed-steel bright uncoated tap only; you need a matching F drill for the 75 percent thread hole and a tap wrench or holder.
When should I choose the H3 limit version of the 5/16-18 UNC tap?
Select the H3 limit when your application requires a standard 2B class of fit for general-purpose threading in steel or similar materials.
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