Cleveland
Cleveland C57246 Spiral Point Tap 3/4-10 UNC HSS 3 Flutes
Cuts 3/4-10 UNC threads in through-holes using a spiral-point design that pushes chips forward for efficient removal
- UNC 3/4-10 thread cuts cleanly in through-holes
- Spiral-point design pushes chips forward for smooth tapping
- High-speed steel body resists wear during repeated use
- Three flutes balance strength and chip clearance
- Bright uncoated finish suits general-purpose threading
Cleveland C57246 Spiral Point Tap
The Cleveland C57246 is a spiral point tap designed for creating internal threads in through-hole applications. It suits machinists and maintenance technicians who need reliable thread cutting in steel or similar materials. The plug chamfer style helps start threads cleanly in a variety of workshop tasks.
3/4-10 UNC thread specification
This tap cuts a 3/4 inch diameter thread with 10 threads per inch in a Unified National Coarse series. The H3 thread limit produces a Class 2B fit, while the 75 percent thread drill size is 16.50 mm. Selecting the correct drill diameter is the single specification that decides whether this is the right part for the hole being prepared.
Installation notes and common issues
The 4 1/4 inch overall length and 2 inch thread length provide reach for standard setups, and the three-flute high-speed steel body clears chips ahead of the cut in through holes. Ensure the workpiece is rigidly clamped and use appropriate cutting fluid to prevent premature wear. A drill size smaller than 16.50 mm or misaligned starting pressure often leads to oversized threads or tap breakage.
Highlights
- UNC 3/4-10 thread cuts cleanly in through-holes
- Spiral-point design pushes chips forward for smooth tapping
- High-speed steel body resists wear during repeated use
- Three flutes balance strength and chip clearance
- Bright uncoated finish suits general-purpose threading
Specifications
| Brand | CLEVELAND |
|---|
Questions about this item
How does the H3 thread limit affect the finished internal thread?
The H3 limit positions the pitch diameter above basic size to produce a class 2B fit with reduced clearance, suitable for general-purpose threading in a range of materials.
What does the 75 percent thread drill size of 16.50 mm mean for hole preparation?
Drill the tap hole to 16.50 mm to achieve approximately 75 percent thread engagement, balancing thread strength with reduced tapping torque.
What are the overall length and thread length, and how do they affect reach in a through-hole?
Overall length is 4 1/4 in with a 2 in thread length, giving enough reach for through-holes up to that depth while leaving shank clearance for the tap wrench.
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