ASME B1.20 is the American national standard for pipe threads. Its most widely used version, ASME B1.20.1, specifically defines NPT (National Pipe Tapered) threads.

Key Features:

• Thread type: Tapered thread profile that ensures sealing when tightened
• Scope: Covers general-purpose pipe threads such as NPT, NPTR, NPSM, and NPSC
• Thread angle: 60° thread profile with a taper angle of 1°47′24″
• Applications: Commonly used in systems carrying water, gas, steam, and other fluids
• Sealing: NPT threads require PTFE (Teflon) tape or thread sealant; NPTF (Dryseal) threads are designed to seal without additional materials
  
  

Purpose and Benefits:

• Defines dimensions, tolerances, and measurement methods for threaded connections
• Provides a design guide for leak-tight and secure joints
• Widely used in threaded fittings such as elbows, tees, and couplings