A clean layout of 316 stainless steel NPTF pipe fittings, showcasing their corrosion-resistant finish for use in harsh industrial environments.

Stainless Steel NPT & NPTF Pipe Fittings

The Old Workhorse, Forged From Armor. For Jobs Where Plated Steel Won't Survive.

The NPT You Know, Built From 316 Stainless.

A tapered pipe thread works the same way whether it's steel or stainless: the threads wedge together to make a seal. The difference isn't the design; it's the material. When you're dealing with saltwater, harsh chemicals, or sanitary requirements, a simple zinc plating on a steel fitting is just a temporary shield. Our 316 Stainless Steel NPT and NPTF fittings are the permanent solution.

Heads Up: Stainless is Tricky. Stainless steel threads have a nasty habit of galling—seizing up solid if you're not careful. To prevent this, you absolutely must use a thread sealant or anti-seize lubricant that's rated for stainless steel. This isn't optional; it's the professional way to do the job.

We machine these fittings from certified 316 stainless for one reason: it's the right tool for the toughest jobs. It gives you total corrosion resistance for critical applications in marine, chemical processing, and food & beverage. For a regular hydraulic system, steel is fine. For a system that's under constant attack from the environment, this is what you need.

Stainless Steel NPT / NPTF Fitting Catalog

NPTF Pipe Female Coupling (Stainless Steel)

Part #: 5000-SS

Connects two male NPT/NPTF pipes/fittings. Made from corrosion-resistant stainless steel (e.g., 316 SS). Female NPTF threads.

NPTF Pipe Male Hex Nipple (Stainless Steel)

Part #: 5404-SS

Connects two female NPT/NPTF ports. Stainless steel construction with hex body. Male NPTF threads.

NPT Pipe Seamless Male Nipple (Stainless Steel)

Part #: 5404N-SS

Seamless stainless steel nipple for connecting two female NPT ports. Male NPT threads.

NPT Hexagon Pipe Male Long Nipple (Stainless Steel)

Part #: 5404LN-SS

Extended length stainless steel hex nipple for connecting female NPT ports with added reach. Male NPT threads.

NPTF Pipe Internal External Connector (Stainless Steel)

Part #: 5405-SS

Stainless steel adapter, typically male NPTF x female NPTF, for corrosion-resistant connections.

NPTF Pipe Hex Reducer Bushing (Stainless Steel)

Part #: 5406-SS

Stainless steel reducer bushing. Male NPTF external, smaller Female NPTF internal. Hex head.

NPTF Pipe Hex Socket Plug (Stainless Steel)

Part #: 5406-HP-SS

Seals a female NPTF port. Stainless steel plug with internal hex drive for flush installation.

NPTF Pipe Hex Head Plug (Stainless Steel)

Part #: 5406-P-SS

Seals a female NPTF port. Stainless steel plug with external hex head for easy installation/removal.

NPTF Pipe Hollow Hex Head Plug (Stainless Steel)

Part #: 5406-P-Hollow-SS

Stainless steel hollow hex head plug for sealing NPTF ports, potentially allowing drainage/venting.

NPTF Pipe Square Head Plug (Stainless Steel)

Part #: 5406-SHP-SS

Seals a female NPTF port. Stainless steel plug with external square head.

NPTF Pipe Cap (Stainless Steel)

Part #: 5406C-SS

Seals the end of a male NPT/NPTF pipe/fitting. Stainless steel cap with female NPTF threads.

NPTF Pipe 90° Male Elbow (Stainless Steel)

Part #: 5500-SS

90° elbow connecting two female NPTF ports. Corrosion-resistant stainless steel. Male NPTF ends.

NPTF Pipe 45° Male Elbow (Stainless Steel)

Part #: 5501-SS

45° elbow connecting two female NPTF ports. Stainless steel construction. Male NPTF ends.

NPTF Pipe 90° Street Elbow (Stainless Steel)

Part #: 5502-SS

90° street elbow in stainless steel. Connects male NPTF to female NPTF port. Male x Female NPTF ends.

NPTF Pipe 45° Street Elbow (Stainless Steel)

Part #: 5503-SS

45° street elbow in stainless steel. Connects male NPTF to female NPTF port. Male x Female NPTF ends.

NPTF Pipe Female 90° Elbow (Stainless Steel)

Part #: 5504-SS

90° elbow connecting two male NPTF pipes/fittings. Stainless steel body. Female NPTF ends.

NPTF Pipe 45° Female Elbow (Stainless Steel)

Part #: 5505-SS

45° elbow connecting two male NPTF pipes/fittings. Stainless steel body. Female NPTF ends.

NPTF Pipe Male Tee (Stainless Steel)

Part #: 5600-SS

Stainless steel tee connecting three female NPTF ports. All ends Male NPTF.

NPTF Female Pipe Branch Tee (Stainless Steel)

Part #: 5601-SS

Stainless steel tee fitting with female NPTF threads on the branch, other ends may vary.

NPTF Pipe Street Tee (Stainless Steel)

Part #: 5602-SS

Stainless steel street tee, typically with one male NPTF and two female NPTF ends.

NPTF Pipe Run Tee (Stainless Steel)

Part #: 5603-SS

Stainless steel tee configuration where branch connection type might differ from the run.

NPTF Male Pipe Branch Tee (Stainless Steel)

Part #: 5604-SS

Stainless steel tee with a male NPTF thread on the 90° branch connection.

NPTF Pipe Branch Tee (Stainless Steel)

Part #: 5605-SS

A standard stainless steel tee configuration for branching hydraulic lines with NPTF connections.

NPTF Pipe Female Cross (Stainless Steel)

Part #: 5652-SS

Connects four male NPTF pipes/fittings at 90° angles. Stainless steel body. All ends female NPTF.

NPTF Pipe Cross (Stainless Steel)

Part #: 5655-SS

Connects four female NPTF ports at 90° angles. Stainless steel body. All ends male NPTF.

NPTF Pipe Male x Pipe Swivel Male 90° Elbow (Stainless Steel)

Part #: 5700-SS

90° stainless steel elbow with one standard male NPTF end and one male NPTF swivel end.

37° JIC Male to NPTF Male Pipe Swivel 90° Elbow (Stainless Steel)

Part #: 5701-SS

90° stainless adapter elbow connecting male JIC to female NPTF port, with swivel NPTF end.

NPTF Pipe Female x Pipe Swivel Male 90° Elbow (Stainless Steel)

Part #: 5702-SS

90° stainless steel elbow with one female NPTF end and one male NPTF swivel end.

The Shop Floor Truth on Stainless NPT

Deciding to use stainless isn't about looks; it's a calculated engineering choice. You're paying more for a part that solves a problem standard steel can't touch. Here’s the breakdown.

Why Pay More for Stainless?

It Stops Rust Cold: In marine environments or on equipment that's constantly washed down, 316 stainless won't rust. Period.
It Fights Off Chemicals: For chemical processing, food & beverage, or pharmaceutical lines, stainless steel won't corrode when exposed to acids or caustic cleaners.
It Handles Hot and Cold: Stainless holds its strength over a much wider temperature range than carbon steel, from high-temp systems to cryogenic applications.
It Stays Clean: The surface is non-porous, making it the only real choice for sanitary applications where you can't have contamination.

The Only Grade That Matters for Tough Jobs: 316

Don't get fooled by a generic "stainless steel" label. There's 304 and there's 316. We use 316 SS because it has molybdenum added to the alloy. That's a fancy way of saying it has extra horsepower when it comes to fighting off chlorides (like salt) and acids. Using 304 in a saltwater environment is a rookie mistake, and it will fail.

The Catch: Galling is a Real Risk

The biggest challenge with stainless is galling, or cold welding. As you tighten the fittings, the friction can cause the threads to seize up so badly you'll have to cut the fitting off. It's not a defect; it's just the nature of the material. The solution is simple: always use a good quality, stainless-compatible lubricant or thread sealant. Go slow and steady when tightening.

Installation is the Same as Steel... With One Critical Difference

The steps are the same as with steel NPT: clean the threads, start it by hand, and use two wrenches. But the critical difference is the sealant. With stainless, the sealant is doing two jobs: it's filling the leak path AND it's acting as a lubricant to prevent galling. Don't skip it, and don't cheap out on it.

For the Jobs Where Steel Won't Survive.

When you need a tapered pipe thread fitting that can stand up to the harshest conditions, 316 Stainless is the only answer. We manufacture and stock these critical components for OEMs and distributors who serve the marine, chemical, and food-grade industries. Let's talk about your project.

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