Cleveland
Cleveland C57177 Spiral Point Tap 3/8-16 UNC 3 Flutes
Spiral point tap cuts 3/8-16 UNC threads in through-holes, three-flute high-speed steel design clears chips forward for efficient threading
- Right-hand cutting direction suits standard threads
- Three flutes balance chip clearance and strength
- High-speed steel resists wear in repeated use
- Bright uncoated finish allows easy inspection
- Spiral-point design pushes chips ahead of tap
Thread cutting tool for UNC holes
The Cleveland C57177 is a spiral point tap designed to cut 3/8-16 UNC threads in through-holes. Its three-flute geometry pushes chips ahead of the cut, making it suited for production runs in steel, aluminium and other ductile metals. Right-hand orientation matches standard tapping heads and hand tap wrenches.
Verify drill size and thread class
Before ordering, confirm that your operation uses a 0.3125 in drill to produce the 75 percent thread engagement this H5 limit tap requires. The 2B-3B class of fit covers most general fastening work, but tighter or looser fits will need a different limit. Overall length is 2 15/16 in with a 1 1/4 in thread length, so check holder reach and workpiece thickness.
Steady cutting in repeated passes
High-speed steel construction retains hardness during extended tapping cycles, while the bright uncoated finish allows lubricant to wet the flutes evenly. Chip evacuation remains consistent because the spiral point continuously clears material forward, reducing torque spikes that can stall a pneumatic driver. The tool is new and ready for immediate use in high-volume threading.
Highlights
- Right-hand cutting direction suits standard threads
- Three flutes balance chip clearance and strength
- High-speed steel resists wear in repeated use
- Bright uncoated finish allows easy inspection
- Spiral-point design pushes chips ahead of tap
Specifications
| Brand | CLEVELAND |
|---|
Questions about this item
Does the Cleveland C57177 spiral point tap come with a drill bit or handle, or must they be purchased separately?
The tap is supplied alone; a 0.3125 in drill bit for the 75 percent thread and a compatible tap wrench are not included and must be bought separately.
Should I choose the H5 thread limit version or a different limit for a standard 3/8-16 UNC hole?
The H5 limit on this tap produces a 2B-3B class of fit, which is the standard tolerance for general-purpose 3/8-16 UNC threading.
What does the 3/8-16 UNC designation mean when I use this tap in a real workpiece?
It cuts a unified coarse thread with a 3/8 inch major diameter and 16 threads per inch, using three flutes to push chips ahead in through-holes.
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