Cleveland
Cleveland Thread Forming Tap #4-40 1.88 in 0 Flutes Bottoming Bright
Forms #4-40 UNC threads in 1.88 in high-speed steel with .31 in thread length and 75% drill size 1.95 mm
- TypeTaps
- Forms threads without chips in #4-40 holes
- 88 in overall length reaches deep bores
- Bright high-speed steel resists wear in repeated use
- Bottoming chamfer cuts full threads near hole bottom
- 31 in thread length matches standard tap drill depth
Thread Forming Tap for #4-40 UNC Threads
This Cleveland C59194 thread forming tap creates internal #4-40 UNC threads in ductile materials by displacing metal rather than cutting it. The bright, uncoated high-speed steel tool suits general-purpose threading tasks where chip removal is difficult. Right-hand threading and a 2B class of fit cover standard fastening requirements. The H3 thread limit provides a precise tolerance band for consistent results.
Capacity and Headroom for Thread Forming
The tap measures 1.88 in overall length with a .31 in thread length, limiting reach to shallow holes. A 75 percent thread drill size of 1.95 mm prepares the correct hole for full thread engagement. Zero flutes mean no chip evacuation path, so the tool works best in through-holes or blind holes with ample clearance at the bottom. Hard or brittle materials exceed the forming capability of this uncoated HSS design.
Practical Limits of the Forming Process
Thread forming requires ductile workpiece material; cast iron, hardened steel or glass-filled plastics will cause premature wear or tap breakage. The absence of flutes prevents lubricant flow to the forming zone, increasing torque and heat in deeper holes. Bright finish offers no wear resistance coating, so tool life drops quickly in abrasive alloys. Users needing higher production rates or harder materials should consider coated cutting taps instead.
Highlights
- Forms threads without chips in #4-40 holes
- 88 in overall length reaches deep bores
- Bright high-speed steel resists wear in repeated use
- Bottoming chamfer cuts full threads near hole bottom
- 31 in thread length matches standard tap drill depth
Specifications
| Brand | CLEVELAND |
|---|---|
| Type | Taps |
Questions about this item
Will the #4-40 tap work with my existing drill press setup?
The tap has a right-hand thread and 1.88 in overall length, so it fits standard drill-press chucks and tapping heads used for UNC threads.
How can I confirm the tap is forming threads correctly after setup?
Check that the formed threads match a 2B class of fit and that the 75 percent thread drill size of 1.95 mm produces full thread engagement without tearing.
Does the package include the 1.95 mm drill bit or only the tap?
The box contains the high-speed-steel thread forming tap only; the 1.95 mm drill bit must be purchased separately.
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