Best NPT Flanges: Top Picks for DIY & Industrial Use

1. 304 Stainless Steel Flange, 4 Inch NPT Thread, Raised Face, Class 150

304 Stainless Steel Flange is strong and rust-resistant. It has a 4-inch NPT thread for tight, secure connections. The Class 150 rating ensures it handles moderate pressure.

The raised face design boosts sealing performance. Threads meet ASME B1.20.1 standards for safety and compatibility.

This flange suits water, gas, or chemical systems. Stainless steel keeps it durable in harsh environments.

2. Half inch NPT Industrial Flange for DIY pipe lighting. 4.25″ large floor flange.

The SteamLit flange is a decorative 1/2 inch floor flange perfect for DIY pipe lighting. It connects your pipe light fixture to an electrical box with ease.

With a 4.25″ diameter, this extra-large flange fits over ceiling electrical boxes. It keeps your industrial design authentic and strong.

1/4″ thick cast plate ensures durability. Mounting holes fit standard electrical boxes, and the center hole works with 1/2″ pipes.

3. HYDRO MASTER Universal Cast Iron Flange for Circulator Pump(pair) (3/4″NPT)

The HYDRO MASTER Universal Cast Iron Flange is a durable and reliable solution for your circulator pump needs. Made from high-quality heavy-duty cast iron, it ensures long-lasting performance. Its 3/4″ female NPT connection makes it compatible with most pumps.

This flange is easy to install using a universal adjustable wrench. It fits all circulator pumps with a flange, offering versatility for various setups. The package includes everything you need: 2 flanges, 4 bolts, and 4 nuts.

With HYDRO MASTER, you get a trusted brand known for quality. The 00210902 model is designed for efficiency and simplicity. Upgrade your pump system with this essential accessory.

4. Half inch NPT Industrial Flange for DIY pipe lighting. 4.25″ large floor flange.

The SteamLit flange is a decorative 1/2 inch floor flange for DIY pipe lighting. It’s perfect for mounting pipe light fixtures to electrical boxes. Its industrial design adds strength and style to your project.

This extra-large 4.25″ flange fits over ceiling electrical boxes easily. It keeps your pipe lighting design authentic while being practical.

Made from 1/4″ thick cast plate, it’s strong and reliable. The raw metal can be painted or treated to prevent rust and match your style.

5. Dixon T400 Carbon Steel Pipe and Welding Fitting, 150lbs ASA Forged Flange, 4″ NPT Female

The Dixon T400 is a carbon steel fitting designed for piping systems. It features a 150-pound ASA forged flange, ensuring strength and durability. This 4-inch NPT female fitting is ideal for connecting pipes or valves.

With a threaded lap joint and bolt holes, it easily connects to bolted flanges or flat surfaces. The carbon steel material provides tensile strength and hardness, making it reliable for various applications. It meets ANSI Class 150 standards, guaranteeing quality and performance.

This fitting handles a maximum pressure of 150 psi, suitable for demanding environments. Its simple design ensures easy installation and long-lasting use. Perfect for industrial and commercial piping needs.

6. Phivan Commercial Sink Faucet Parts Brass Coupling Flanges 1/2 NPT Female Adjustable Eccentric Inlet for 8 Inch Center Wall Mount Faucet Installation (2 Pcs)

Phivan Commercial Sink Faucet Parts include adjustable eccentric flanges to fit 8” center faucets. These flanges adapt to backsplash holes with a center distance from 7.75” to 8.25”. They ensure a secure, stable installation for wall-mounted faucets.

The flanges have a 1/2” NPT female thread to connect water pipes. They work with Phivan faucets like PVF-PK8 and brands like B-W-E or Favor-po. Adapters may be needed if pipes lack a matching male thread.

Made of durable brass with a chrome-plated finish, they resist corrosion and wear. Each set includes two rubber gaskets for tight, leak-free connections.

7. HYDRO MASTER Solid Brass Flange Kit with Gaskets, 1″ NPT thread, For Radiant Heating Systems (1″ FNPT)

The HYDRO MASTER Solid Brass Flange Kit is built to last with lead-free solid brass. It’s perfect for radiant heating systems and works with 1″ NPT female threads.

This kit fits all circulator pumps and is easy to install with a universal adjustable wrench. It includes everything you need: 2 flanges, 2 gaskets, 4 nuts, and 4 bolts.

8. Krowne 21-400L Krowne Silver Series Coupling Flanges, (2) Pieces, 1/2″ NPT Female Inlet, Low Lead Compliant (fits 12-8XX Silver Series 8″ Center Wall Mount Faucet,)‌​‍​​‌‌​‌‌‍​​‌‌​‌‌‍​​‌‌‌​‍​

The Krowne 21-400L Coupling Flanges are essential for your faucet setup. They ensure a secure and reliable connection.

These flanges come in a set of two with a 1/2″ NPT female inlet. They are low lead compliant, meeting safety standards.

Designed for the Silver Series 8″ center wall mount faucet, they fit perfectly and are easy to install. A smart choice for any plumbing project.

9. Grundfos 519601 Cast Iron Flange Set for UP Series Circulator Pumps-3/4 NPT, Black, 347

This Cast Iron Flange Set works with Versa Flo UP and UPS pumps. It has a 3/4-inch NPT pipe connection for easy setup. The set includes 2 flanges, 2 gaskets, and 2 bolts with nuts.

The GF 15/26 pump connection ensures a snug fit. Its threaded design adds security to your system.

These parts are built to last. The strong, long-lasting cast iron build handles tough use. Installation is simple with all pieces included.

10. Flange Kit, Pipe Size 1 1/2 in.NPT, SS, PK2

This Flange Kit connects pipes to Taco pumps. It includes cap screws and nuts for secure installation.

Made of stainless steel, it handles up to 125 PSI pressure. Fits 1 1/2 in. NPT pipe size. Works with most Taco 00 and 1400 Series pumps.