Cleveland
Cleveland C55150 Straight Flute Hand Tap 7/8"-14 UNF Plug HSS TiN
A straight-flute hand tap cuts 7/8"-14 UNF threads to a 2.22 in depth in a 4.69 in overall length using HSS with TiN coating
- TypeTaps
- 7/8"-14 UNF plug tap cuts precise internal threads
- High-speed steel with TiN coating resists wear during repeated use
- 22 in thread length reaches deep holes effectively
- 69 in overall length provides solid leverage for hand tapping
- H4 thread limit ensures 2B class fit accuracy
Cleveland C55150 Threading Tool
The Cleveland C55150 is a straight flute hand tap designed to cut 7/8"-14 UNF threads in through holes or blind holes with adequate chip clearance. Machinists and maintenance technicians select this HSS TiN tool for general-purpose threading in steel and non-ferrous alloys. The plug chamfer provides a balanced start for both hand and machine tapping operations. Thread limit H4 targets a class 2B fit for standard fastener assemblies.
Upgrade From Carbon Steel Taps
This tap replaces uncoated high-speed steel or carbon steel taps when longer tool life and reduced galling are required. The TiN coating lowers friction and resists built-up edge in sticky materials such as aluminium or low-carbon steel. The jump is justified when production volumes exceed occasional repairs or when tapping stainless steels where work hardening dulls uncoated flutes quickly. Users staying with manual-only, low-volume work in mild steel may not recover the cost premium.
Sustained Load Behaviour
Under continuous machine tapping the TiN layer maintains hardness at elevated temperatures, preserving cutting geometry through repeated holes. High-speed steel substrate absorbs shock from intermittent hand-driven cuts without chipping. The 2.22 in thread length and 4.69 in overall length provide rigidity to resist deflection during deep cuts. Chip evacuation in blind holes remains the limiting factor; periodic reversal clears swarf to prevent flute packing and tap breakage.
Highlights
- 7/8"-14 UNF plug tap cuts precise internal threads
- High-speed steel with TiN coating resists wear during repeated use
- 22 in thread length reaches deep holes effectively
- 69 in overall length provides solid leverage for hand tapping
- H4 thread limit ensures 2B class fit accuracy
Specifications
| Brand | CLEVELAND |
|---|---|
| Type | Taps |
Questions about this item
What drill size is needed for the 7/8"-14 UNF tap?
Use a 20.40 mm drill to achieve a 75 percent thread engagement before tapping.
How do you start the tap straight in a blind hole?
Apply cutting oil, align the 4.69 in tap perpendicular to the workpiece, and turn the handle slowly for the first few threads to prevent cross-threading.
When should this HSS TiN tap be replaced?
Replace it when the cutting edges dull, chips clog the 2.22 in thread length, or threads no longer meet the 2B class of fit.
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