1-11-1 2 NPT Tap Drill: Understanding the Basics
What is a 1-11-1 2 NPT Tap Drill?
A 1-11-1 2 NPT tap drill is a type of drill bit used to create a tapered thread in a material, typically metal, to accommodate a National Pipe Taper (NPT) thread. The "1-11-1" refers to the drill bit's diameter, while "2 NPT" indicates the thread size and type.
How Does a 1-11-1 2 NPT Tap Drill Work?
To create a 2 NPT thread, a 1-11-1 2 NPT tap drill is used to drill a hole with a specific angle and diameter. The drill bit is designed to create a tapered hole that matches the NPT thread's dimensions. The drill bit's cutting edges are angled to produce a tapered hole, ensuring a secure and leak-tight connection when a corresponding plug or fitting is inserted.
Key Characteristics of a 1-11-1 2 NPT Tap Drill
- Diameter: 1-11-1 (1.0937 inches or 27.78 mm)
- Thread Size: 2 NPT
- Material: Typically high-speed steel (HSS) or tungsten carbide (WC) for durability and wear resistance
- Cutting Angle: Tapered to create a 2 NPT thread
- Point Angle: Typically 120° to 135° for efficient drilling and thread formation
Applications of a 1-11-1 2 NPT Tap Drill
1-11-1 2 NPT tap drills are commonly used in various industries, including:
Piping and Fittings: For creating threads in pipes and fittings for gas, oil, and water transmission lines.
HVAC: For installing threads in heating, ventilation, and air conditioning systems.
Automotive: For creating threads in fuel lines, brake lines, and other automotive applications.
Conclusion
A 1-11-1 2 NPT tap drill is a specialized tool designed to create a 2 NPT thread in various materials. Understanding its design, characteristics, and applications can help users select the right drill bit for their specific needs, ensuring efficient and accurate threading operations.
