DELPHI FITTINGS
316 Stainless Steel NPSM Swivel Fittings - For Corrosive Environments
The Hose-Saver Swivel, Built to Survive the Nasty Stuff.
For When the Hose Has to Swivel and the Fitting Can't Rust.
The standard steel NPSM swivel is a smart fitting that stops you from twisting up a hose during install. This is the version you use when that hose is on a boat, in a chemical plant, or on a machine that gets a caustic washdown every night. We take the same problem-solving swivel design and machine it from solid 316 stainless steel for total corrosion resistance. For standard applications, see our primary line of Carbon Steel NPSM Swivels.
Like the steel version, the straight NPSM threads are just for clamping muscle—the seal happens on the male tapered thread it connects to. The real upgrade here is the material. For any distributor or OEM supplying parts for marine, chemical, food & beverage, or pharmaceutical industries, this is a critical part to have in your catalog. It's the right tool for a tough job.
Stainless Steel NPSM Female Pipe Swivel Fitting Catalog
NPT Pipe Male x NPSM Female Pipe Swivel (Stainless Steel)
Part #: 1404-SSStraight adapter connecting a male NPT fitting/pipe to a female NPSM swivel end. Stainless steel construction. Seal occurs on male NPT threads.
NPTF Pipe Female x NPSM Pipe Swivel Female Adapter (Stainless Steel)
Part #: 1405-SSStraight adapter connecting a male NPTF fitting/pipe to a female NPSM swivel end. Corrosion-resistant stainless steel.
NPSM Pipe Swivel Female Union (Stainless Steel)
Part #: 1406-SSStainless steel union connecting two male NPT/NPTF fittings/pipes of the same size, allowing swivel action.
NPTF Pipe Male x NPSM Pipe Swivel Female 90° Elbow (Stainless Steel)
Part #: 1501-SS90° stainless elbow connecting a male NPTF pipe/fitting to a female NPSM swivel end.
NPTF Male Pipe x Female NPSM 90° Elbow Long (Stainless Steel)
Part #: 1501LL-SSExtended length version of the 90° Male NPTF x Female NPSM swivel elbow in stainless steel.
NPTF Pipe Female x NPSM Pipe Swivel Female 90° Elbow (Stainless Steel)
Part #: 1502-SS90° stainless elbow connecting two male NPTF pipes/fittings, with one female NPSM swivel end.
NPTF Pipe Male x NPSM Pipe Swivel Female 45° Elbow (Stainless Steel)
Part #: 1503-SS45° stainless elbow connecting a male NPTF pipe/fitting to a female NPSM swivel end.
NPTF Pipe Female x NPSM Pipe Swivel Female 45° Elbow (Stainless Steel)
Part #: 1504-SS45° stainless elbow connecting two male NPTF pipes/fittings, with one female NPSM swivel end.
Branch Tee NPTF Male x NPSM Female Swivels (Stainless Steel)
Part #: 1601-SSStainless steel tee, typically with male NPTF ends on the run and a female NPSM swivel on the branch.
Branch Tee, NPSM Female Swivel x NPSM Swivel x NPTF Female (Stainless Steel)
Part #: 1602-SSStainless steel tee configuration with two female NPSM swivel ends and one female NPTF end.
NPSM Pipe Swivel Female Tee (Stainless Steel)
Part #: 1603-SSConnects three male NPT/NPTF threaded fittings/pipes in a tee configuration using stainless steel female NPSM swivel nuts.
The Shop Floor Truth on Stainless Swivels
This is a specialty part for a special set of problems. It costs more than a steel one for a good reason. Here's what you need to know before you spec it.
Why You Pay More for a Stainless Swivel
You choose this fitting when the environment is going to attack and destroy a standard zinc-plated part. That means:
- Marine & Offshore: Any hose connection exposed to saltwater or salt spray needs 316 stainless. There's no way around it.
- Chemical Plants & Processing: For lines that see aggressive fluids that would strip a plated fitting.
- Food & Beverage Equipment: Stands up to the daily caustic washdowns without pitting or rusting, which is critical for sanitation.
- Anywhere Else Rust is a Dealbreaker: For any high-humidity or outdoor application where you need a hose connection to last.
How it Works: It's All About the Swivel and the Seal
This part solves two problems at once, but it's important to know how it works:
- The Swivel Prevents Hose Damage: The nut spins freely, so you can tighten the connection without putting any damaging twist on the hose assembly. This is its primary mechanical job.
- The Material Prevents Corrosion: The 316 stainless steel body and nut won't rust or degrade when exposed to harsh conditions. This is its primary material job.
- The Seal Still Happens on the Male End: Remember, the NPSM threads are straight—they don't seal. The connection becomes leak-proof when it's tightened onto a male NPT or NPTF fitting, and the seal is formed on those tapered threads.
Installation: The Galling Rule
The rules are the same as for a steel swivel: use two wrenches, don't over-tighten, get your alignment right. But with stainless, there's one extra, non-negotiable rule: You must use a good anti-seize or thread sealant on the male threads. If you try to tighten stainless on stainless dry, the threads can gall and seize up permanently. Go slow, use lubricant, and you won't have a problem.
Straight Answers to Stainless NPSM Swivel Questions
When is stainless steel necessary for an NPSM swivel?
You need a stainless steel NPSM swivel when the connection is exposed to corrosive elements like saltwater (marine), harsh chemicals, or frequent caustic washdowns (food & beverage). In these environments, standard plated steel will eventually corrode and fail.
How does a stainless NPSM swivel seal?
The sealing mechanism is the same as the steel version. The NPSM swivel's straight threads do not seal; they provide clamping force. The seal is created on the tapered threads of the male NPT or NPTF fitting that it connects to.
Do I need special sealant for stainless NPSM connections?
Yes. Because stainless steel is prone to galling (threads seizing), it is critical to use a thread sealant or anti-seize paste that is specifically rated for stainless steel. This should be applied to the male NPTF threads before assembly.
The Right Swivel for the Harshest Jobs.
When your customers are working in corrosive environments, give them the fitting that solves the problem for good. Pair these stainless steel NPSM swivels with our 316 stainless NPTF pipe fittings and you have a fully corrosion-resistant thread-and-swivel package for marine, chemical and washdown duty.
Get a Quote on Stainless Swivels Need Standard Steel Swivels?