Cleveland
Cleveland C54973 Straight Flute Hand Tap 1-1/8"-12 UNF Bottoming 4 Flutes pneumatic accessory
A straight-flute hand tap for cutting 1-1/8"-12 UNF internal threads, bottoming style with four flutes in high-speed steel
- TypeTaps
- Straight flute design clears chips efficiently in through holes
- 1-1/8"-12 UNF thread cuts precise fine-pitch fasteners
- Bottoming chamfer reaches full depth in blind holes
- High-speed steel construction resists wear during repeated use
- H4 thread limit ensures Class 2B fit accuracy
Cleveland C54973 Threading Tap
The Cleveland C54973 is a straight flute hand tap designed to cut unified national fine threads with a 1-1/8 inch diameter and 12 threads per inch. It suits machinists and maintenance technicians who need to create internal threads in through-holes or blind holes using hand or pneumatic drive. The bottoming chamfer allows threading close to the bottom of a blind hole. High-speed steel construction provides durability for general-purpose steel and non-ferrous materials.
Verify Hole Size And Tool Holding
Before ordering, confirm the drilled hole matches the 75 percent thread drill size of 1.0438 in to achieve a class 2B fit. Ensure the tap wrench or pneumatic driver accommodates the tap shank and can apply steady, aligned torque. Check that the workpiece material is compatible with an uncoated high-speed steel cutting tool. The H4 thread limit indicates the pitch diameter tolerance; verify this meets the engineering specification for the assembly.
High-Speed Steel Build And Bottoming Geometry
The bright, uncoated high-speed steel body resists wear during repetitive hand or powered tapping operations. Four straight flutes provide chip clearance and cutting stability in a range of materials. The bottoming design features a short chamfer of one to two threads, enabling full thread depth near the base of blind holes. Right-hand cutting orientation follows standard threading practice. The overall length of 5 7/16 in and thread length of 2 9/16 in allow access to moderately deep holes.
Highlights
- Straight flute design clears chips efficiently in through holes
- 1-1/8"-12 UNF thread cuts precise fine-pitch fasteners
- Bottoming chamfer reaches full depth in blind holes
- High-speed steel construction resists wear during repeated use
- H4 thread limit ensures Class 2B fit accuracy
Specifications
| Brand | CLEVELAND |
|---|---|
| Type | Taps |
Questions about this item
Does the Cleveland C54973 tap include a drill bit or handle, or must they be purchased separately?
The Cleveland C54973 is a straight-flute hand tap only. A 1.0438 in drill bit for the 75 percent thread size and a compatible tap wrench must be purchased separately.
How do I choose between the available thread limits or classes of fit for this 1-1/8"-12 UNF tap?
This model is manufactured to a single specification: thread limit H4 and class of fit 2B. No alternative limits or classes are offered for this part number.
What does the 5 7/16 in overall length mean when the tap is used in a standard tap wrench?
The 5 7/16 in overall length provides sufficient reach for deep holes while fitting a standard tap wrench, with a 2 9/16 in thread length that engages the full depth of the cut.
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