NC Thread Plug Tap is a tool used to cut internal threads in a pre-drilled hole, conforming to the Unified National Coarse (UNC) thread standard. The "Plug" designation refers to the tap's chamfer type, which typically has 3 to 5 tapered threads at the tip. This design allows for easier starting and is suitable for both through holes and blind holes that don't require threading all the way to the bottom.
Product Data
Feature
Specification
Thread Standard
Unified National Coarse (UNC / NC)
Thread Angle
60°
Chamfer Type
Plug (3–5 threads chamfered)
Flute Type
Straight Flute
Material
High-Speed Steel (HSS), Carbon Steel, or Cobalt
Coating/Finish
Bright, Black Oxide, Titanium Nitride (TiN)
Thread Class
2B (standard fit)
Thread Direction
Right-Hand
Applications
Hand tapping, machine tapping, general-purpose threading
Standards
ISO 529
Typical Sizes
#4-40, #6-32, #8-32, #10-24, 1/4-20, 5/16-18, 3/8-16, 1/2-13, etc.
Tap Drill Size
Varies by thread size (e.g., #7 drill for 1/4-20 UNC)
Number of Flutes
Typically 3 or 4
Thread Limit
H2 or H3 (indicates tolerance class)
Overall Length
Varies by size (e.g., 2" for #6-32 tap)
Thread Length
Varies by size (e.g., 3/8" for #6-32 tap)
Square Size
Varies by size (e.g., 0.110" for #6-32 tap)
Applications
Through-Hole Threading: Ideal for creating threads in holes that go entirely through the material, allowing easy chip evacuation and full thread formation.
Blind Hole Threading:Suitable for threading holes that do not go all the way through the material, stopping short of the bottom.
General-Purpose Threading: Commonly used in various materials like steel, aluminum, brass, and plastics for creating standard threads.
Maintenance and Repair:Useful for cleaning or rethreading existing threads in maintenance tasks.
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