Cleveland
Cleveland C58615 Spiral Flute Tap 1/2-20 UNF 3 Flute
Cuts 1/2-20 UNF internal threads in blind holes using three spiral flutes that pull chips clear, made from uncoated high-speed steel with H3 thread limit for a 2B class fit
- TypeTaps
- Spiral flutes clear chips in blind holes
- 1/2‑20 UNF thread cuts fine‑pitch fasteners
- High‑speed steel resists wear on tough materials
- Three flutes balance strength and chip flow
- H3 limit gives a 2B class of fit
Cleveland C58615 Spiral Flute Tap Overview
The Cleveland C58615 is a spiral flute tap designed for creating internal threads in metalworking applications. It suits machinists and maintenance technicians who need to cut precise UNF threads in through-holes or blind holes. The tool is made from high speed steel with a bright uncoated finish for general-purpose use. It arrives in new condition ready for immediate workshop deployment.
1/2-20 UNF Thread Specification
This tap cuts a 1/2 inch minus 20 UNF thread with a class 2B fit and H3 thread limit. The right-hand thread direction follows standard fastener conventions for assembly compatibility. A 75 percent thread drill size of 11.40 mm is required to prepare the hole before tapping. The 3/8 inch thread length and three-flute geometry promote efficient chip evacuation during the cutting cycle.
High Speed Steel Build Integration
The high speed steel construction withstands the heat generated when threading ferrous and non-ferrous metals without premature wear. The bright finish avoids coating buildup that can alter thread pitch diameter in tight-tolerance work. The 3 3/8 inch overall length fits standard tap holders and provides reach for deeper holes. Builders needing left-hand threads or larger diameters must select a different tool.
Highlights
- Spiral flutes clear chips in blind holes
- 1/2‑20 UNF thread cuts fine‑pitch fasteners
- High‑speed steel resists wear on tough materials
- Three flutes balance strength and chip flow
- H3 limit gives a 2B class of fit
Specifications
| Brand | CLEVELAND |
|---|---|
| Type | Taps |
Questions about this item
How does the 3-flute design affect chip removal when tapping a blind hole?
Three spiral flutes pull chips backward out of the hole instead of packing them forward, reducing the risk of tap breakage in blind-hole work.
What does the UNF 1/2-20 thread standard mean for the fit of the finished thread?
Unified National Fine 1/2-20 produces a 2B class fit with an H3 limit, giving a standard precision internal thread for general fastening.
What size tap drill is required before using this 1/2-20 tap?
A 75-percent thread drill size of 11.40 mm is specified to prepare the hole for this tap.
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