Cleveland
Cleveland C54996 Straight Flute Hand Tap 1-1/4"-7 UNC Bottoming HSS 5.75 in OAL
Straight-flute hand tap cuts 1-1/4"-7 UNC threads to a 2.56 in depth in a 5.75 in OAL HSS body with H4 limits for 2B fit
- TypeTaps
- Straight flute design clears chips in through holes
- Bottoming chamfer cuts threads to full depth
- High-speed steel resists wear in steel and iron
- 56 in thread length reaches deeper holes
- H4 limit fits class 2B internal threads
Cleveland Straight Flute Hand Tap 1-1/4"-7 UNC
This Cleveland C54996 straight flute hand tap cuts 1-1/4"-7 UNC threads in a single operation. The bottoming chamfer reaches near the bottom of blind holes for full thread depth. It suits maintenance technicians and machinists producing class 2B fits in steel or cast iron.
Bottoming chamfer limits starting ability
The short bottoming chamfer requires a pre-started hole or a taper tap to begin threading. Straight flutes push chips ahead of the cutter, so the tap works best in through holes or blind holes with adequate chip clearance. Frequent reversal clears chips and prevents binding in ductile materials.
Verify hole size and material compatibility
Check that your drill produces the 1.1108 inch hole specified for 75 percent thread engagement. Confirm the workpiece material is compatible with uncoated high speed steel cutting edges. Ensure your tap holder accommodates the 5.75 inch overall length and right-hand rotation.
Highlights
- Straight flute design clears chips in through holes
- Bottoming chamfer cuts threads to full depth
- High-speed steel resists wear in steel and iron
- 56 in thread length reaches deeper holes
- H4 limit fits class 2B internal threads
Specifications
| Brand | CLEVELAND |
|---|---|
| Type | Taps |
Questions about this item
Should I choose the H4 thread limit or a different class of fit for a standard 1-1/4"-7 UNC hole?
The tap is made to H4 limits for a 2B class of fit, which is the standard tolerance for general-purpose unified coarse threads.
What does the 2.56 in thread length mean when I am tapping a through-hole in thick plate?
The 2.56 in threaded portion is the maximum depth of full-form threads the tap can cut in a single pass; deeper holes require multiple passes or a longer tap.
How does the 75 percent thread drill size of 1.1108 in affect tap life in high-speed steel?
Drilling to 1.1108 in leaves 75 percent thread engagement, reducing cutting torque and extending the life of the uncoated high-speed steel flutes.
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