Cleveland
Cleveland 54892 Straight Flute Hand Tap 7/8"-14 UNF H4
Straight-flute hand tap cuts 7/8"-14 UNF threads in through or blind holes using high-speed steel
- TypeTaps
- Cuts precise 7/8"-14 UNF threads with H4 class-of-fit accuracy
- Bottoming chamfer reaches full depth in blind holes
- High-speed steel body resists wear on tough materials
- 69 in overall length and 2.22 in thread length suit standard tap holders
- Bright uncoated finish allows easy inspection of cutting edges
Thread-cutting tool for UNF holes
The Cleveland 54892 is a straight-flute hand tap made from high-speed steel with a bright uncoated finish. It cuts right-hand 7/8"-14 UNF threads in a single pass and is intended for general-purpose threading in through or blind holes where machine tapping is not available.
H4 thread limit for Class 2B fit
The tap is manufactured to an H4 thread limit, which matches a Class 2B internal thread tolerance. This specification determines whether the finished hole will accept standard UNF fasteners without binding or excessive play, making it the critical figure to verify against the drawing or fit requirement.
Thread length 2.22 in with 75 % drill size 20.40 mm
The 2.22 in thread length provides enough engagement for typical fastener lengths in this diameter, while the recommended 75 % thread drill size of 20.40 mm leaves sufficient material for thread strength. Deeper holes or harder materials may exceed the practical reach of a hand tap and require a longer or machine-specific tool.
Highlights
- Cuts precise 7/8"-14 UNF threads with H4 class-of-fit accuracy
- Bottoming chamfer reaches full depth in blind holes
- High-speed steel body resists wear on tough materials
- 69 in overall length and 2.22 in thread length suit standard tap holders
- Bright uncoated finish allows easy inspection of cutting edges
Specifications
| Brand | CLEVELAND |
|---|---|
| Type | Taps |
Questions about this item
What does the 7/8"-14 UNF thread size mean when I am cutting threads in a workpiece?
It produces a unified fine thread with a 7/8 inch major diameter and 14 threads per inch, suited for precision fastening.
How does the H4 thread limit affect the class of fit?
The H4 limit provides a 2B class of fit, giving a controlled tolerance for standard nut and bolt assemblies.
What drill size and tap dimensions are needed to use this tool correctly?
Use a 20.40 mm drill for 75 percent thread engagement; the tap has a 4.69 in overall length and 2.22 in thread length.
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