Cleveland
Cleveland C54761 Straight Flute Hand Tap 9/16"-12 UNC Bottoming HSS
Cuts 9/16"-12 UNC internal threads in a 1.66 in thread length with a 3.59 in overall length HSS bottoming tap
- TypeTaps
- Cuts precise UNC threads with 9/16"-12 sizing
- Bottoming chamfer threads to the bottom of blind holes
- High-speed steel resists wear during repeated hand tapping
- 66 in thread length suits standard hole depths
- 20 mm drill size ensures 75 percent thread engagement
Thread-cutting tap for 9/16"-12 UNC holes
This Cleveland C54761 straight-flute hand tap cuts internal threads in a 9/16 inch diameter with 12 threads per inch. It is made from high-speed steel with a bright uncoated finish. The bottoming chamfer allows threading close to the bottom of blind holes. The tool is designed for right-hand threads with a H3 thread limit and 2B class of fit.
Fits standard tap holders and wrenches
The tap has an overall length of 3.59 inches and a thread length of 1.66 inches. It requires a 75 percent thread drill size of 12.20 mm to prepare the hole before tapping. The straight-flute design works with hand-operated tap wrenches or powered tapping heads. No special holders or coolant systems are needed for basic operation.
Handles through and blind holes in general materials
The high-speed steel construction provides wear resistance for threading carbon steel, alloy steel, and similar ferrous metals. The bottoming style cuts threads nearly to the bottom of a blind hole, while the straight flutes clear chips adequately in shallow depths. It is not suited for deep blind holes where chip evacuation becomes difficult or for very hard materials that exceed the hardness range of standard HSS.
Highlights
- Cuts precise UNC threads with 9/16"-12 sizing
- Bottoming chamfer threads to the bottom of blind holes
- High-speed steel resists wear during repeated hand tapping
- 66 in thread length suits standard hole depths
- 20 mm drill size ensures 75 percent thread engagement
Specifications
| Brand | CLEVELAND |
|---|---|
| Type | Taps |
Questions about this item
When does the H3 thread limit on this 9/16"-12 UNC tap start to affect hole fit?
The H3 limit controls the pitch-diameter tolerance for a Class 2B fit; it becomes the limiting factor whenever the drilled hole is at the tight end of the 12.20 mm size range.
How much heat builds up in the high-speed steel body during a full-day production run?
High-speed steel retains hardness at elevated temperature, so the tap stays within working limits as long as cutting fluid is supplied and chip evacuation through the 1.66 in thread length is not blocked.
What holder or machine setup is needed to drive this 3.59 in overall-length tap?
A standard tap wrench or CNC tool holder that accepts a straight-shank HSS tap with right-hand rotation is required; the 9/16"-12 UNC size fits common 1/2 in capacity chucks.
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