Cleveland
Cleveland C59284 Thread Forming Tap 1/4"-20 Plug Bright 0 Flutes
Forms internal UNC threads in 1/4"-20 holes with a 0.63 in thread length and 2.5 in overall length
- TypeTaps
- Forms threads without chips for clean holes
- 1/4"-20 UNC plug tap fits standard coarse threads
- Bright high-speed steel resists wear in general use
- 5 in overall length with 0.63 in thread length
- 75 % thread engagement with 5.70 mm drill size
Thread Forming Tap 1/4"-20 UNC
This Cleveland C59284 tap forms internal threads in ductile materials rather than cutting them. It suits maintenance technicians and assembly shops producing 1/4"-20 UNC threads to a 2B-3B class of fit. The H6 thread limit and 75 percent thread drill size of 5.70 mm match standard tapping drill charts for this size.
Plug Chamfer and Bright Finish Limits
The plug chamfer needs several threads of engagement before full depth is reached, so blind holes must be deeper than the 0.63 in thread length. The bright, uncoated high-speed steel surface offers no lubricity or wear coating, limiting tool life in abrasive or high-volume production compared with coated alternatives.
Pre-Order Setup Checks
Verify the workpiece material is ductile enough for thread forming — brittle alloys will fracture instead of flowing. Confirm the tap drill diameter is 5.70 mm to achieve the specified 75 percent thread engagement. Ensure the machine spindle runs right-hand rotation and that the holder accommodates the 2.5 in overall length without interference.
Highlights
- Forms threads without chips for clean holes
- 1/4"-20 UNC plug tap fits standard coarse threads
- Bright high-speed steel resists wear in general use
- 5 in overall length with 0.63 in thread length
- 75 % thread engagement with 5.70 mm drill size
Specifications
| Brand | CLEVELAND |
|---|---|
| Type | Taps |
Questions about this item
Should I choose the 1/4"-20 thread size or a different size for my application?
Choose the 1/4"-20 size when you need to form threads in a hole drilled to 5.70 mm for a 75 percent thread engagement; other sizes are for different bolt diameters.
What does the 2.5 in overall length mean once the tap is in the machine?
The 2.5 in overall length determines how deep the tool can reach into a workpiece before the holder contacts the surface.
What does the H6 thread limit cap in practice?
The H6 limit controls the maximum pitch diameter so the formed internal thread stays within the 2B-3B class of fit.
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