NPT thread copper female adapter 1/4″ to 4″

This is NPT thread copper female adapter with a socket weld (sweat) end for copper tubing and a female NPT (National Pipe Taper) threaded end. It is made of high-purity red copper (C12200), compliant with US plumbing standards (ASME B1.20.1, NSF/ANSI 61). Check our full selection of copper pipe adapters for more options.

Primary Uses:

• Connects copper pipes to male NPT threaded valves, faucets, or steel pipes.
• Ideal for potable water supply lines, HVAC/R systems, hydronic heating, and industrial fluid pipelines. For G thread requirements, see our BSPP G thread adapter.
• Enables secure, leak-proof transition between welded copper and threaded components. We also supply the copper male adapter for complete installation.
• Compatible with residential, commercial, and industrial plumbing systems.

Core Product Information (Key Specifications)

• Material: Red Copper (C12200), lead-free, corrosion-resistant, high thermal conductivity
• Connection Type: One end = Socket Weld (Sweat); Other end = Female NPT (FNPT)
• Available Sizes (Socket ID × NPT Thread):
  • 9.52mm (3/8″) × 1/4″ NPT
  • 12.7mm (1/2″) × 3/8″ NPT
  • 15.88mm (5/8″) × 1/2″ NPT
  • 22.23mm (7/8″) × 3/4″ NPT
  • 28.6mm (1-1/8″) × 1″ NPT
  • 34.92mm (1-3/8″) × 1-1/4″ NPT
  • 41.3mm (1-5/8″) × 1-1/2″ NPT
  • 53.98mm (2-1/8″) × 2″ NPT
  • 66.7mm (2-5/8″) × 2-1/2″ NPT
  • 79.4mm (3-1/8″) × 3″ NPT
  • 104.8mm (4-1/8″) × 4″ NPT
• Thread Standard: NPT (American National Standard Taper Pipe Thread, 60° angle, 1:16 taper)
• Pressure Rating: Up to 20 bar (300 PSI) at room temperature
• Temperature Range: -20°C to 200°C (-4°F to 392°F)
• Installation: Socket end brazed/soldered to copper pipe; NPT end threaded to male fittings
• Features: Durable thick-wall construction, leak-proof NPT seal, high heat & pressure resistance, easy to clean & maintain