Swagelok® Tube Fitting Cross-Reference: Crestflo Equivalents in Stainless AND Exotic Alloys

Reviewed by the Crestflo Engineering Team

Crestflo isn't affiliated with, authorized by, sponsored by, or endorsed by Swagelok Company. "Swagelok®" is a registered trademark of Swagelok Company. Every reference on this page is nominative. We use these names only to identify the parts you already know, so you can find the dimensionally equivalent Crestflo fitting. All claims here are factual and dimensional, nothing more. What Crestflo supplies are independently manufactured equivalents, not genuine Swagelok products.

Match your Swagelok® part to a Crestflo equivalent

Crestflo makes dimensional equivalents to Swagelok® tube fittings, two-ferrule instrumentation compression fittings tested to ASTM F1387. They're available in 316 stainless and exotic alloys, including Hastelloy, Super Duplex, Inconel, and Monel. Delivery runs 6-8 weeks. Send us the Swagelok part numbers you're currently buying, and we'll send back the interchange equivalent, the alloys it ships in, and a quote.

Request your Swagelok cross-reference & quote → · Send us a print or a sample, and we'll find the equivalent for you.

Scope: Crestflo compression tube fittings are instrumentation fluid-system parts made from stainless steel and alloy, not plumbing or copper compression fittings. And when we say "ferrule" here, we're talking about a fluid-system compression ferrule. Not an electrical wire ferrule.

Designations & related terms

There's just one reference block on this page. Search it by whatever term you use; every entry points back to the same interchange.

What Swagelok tube fittings are

Swagelok® tube fittings are two-ferrule instrumentation compression fittings, built to seal small-bore stainless and alloy tubing in analytical, process, and hydraulic systems. A complete fitting has four parts: a body, a nut, a front ferrule, and a back ferrule. Pull the nut up and it drives the ferrules onto the tube OD, producing a gas-tight, mechanically gripped joint. Swagelok publishes an ordering-code pattern that buyers recognize on sight, `SS-500-4` or `SS-810-4`, say, where `SS` marks 316 stainless and the numeric fields spell out tube OD and end sizing. Crestflo builds to that same two-ferrule geometry and the same size conventions. That's exactly what makes a location-for-location swap possible.

Swagelok cross-reference: how to find your Crestflo equivalent

Swagelok cross-reference tells you one thing: buy that part today, and what's the Crestflo equivalent that fits the same dimensions, and in which alloys does it come? Part-number mapping can't be guessed. It has to be checked against your exact series, size, and material. That's why Crestflo builds your cross-reference to order instead of handing you a generic parts table. Every equivalent stays true to your bill of materials that way.

Swagelok part number cross reference: how to request it

Send the Swagelok part numbers, a line-card export, a drawing, or a physical sample. Crestflo's Engineering Team sends back the interchange equivalent, notes on ferrule and connection parity, the alloys available, and a quote. No login. No gated tool to get in the way.

Request your Swagelok® cross-reference →

Swagelok cross-reference chart / PDF: what you get instead

Where competitors bury interchange data in gated tools or PDFs you can't search, Crestflo hands back your chart as a clean, verified document tied to your actual part list. Request it through the request-a-quote form, or just email sales@crestflousa.com.

Swagelok 316 / SS-series equivalent

Crestflo's `SS` / S-series lines, made from 316 stainless, sit at the core of its interchange. Every equivalent comes standard in 316/316L. Want something else? 904L and the full alloy range below are there on request.

Swagelok B-series equivalent (brass)

Swagelok's B-series is brass. That puts it outside Crestflo's US instrumentation scope, since Crestflo doesn't build its lineup around brass as a material. Stainless and alloy lines are where Crestflo lives. If your B-series application can shift to 316 SS or an alloy, we'll cross-reference it to the matching CRA fitting.

The wedge: Swagelok equivalents in stainless AND exotic alloys

This is where Crestflo separates from stainless-only cross-references: the same dimensionally equivalent fitting is available not just in 316 SS but across exotic and corrosion-resistant alloys. Availability is by fitting type and alloy; per-part confirmation comes with your quote.

Alloy-availability matrix, Crestflo Swagelok-equivalent fittings

A checkmark means the item's available, or can be made to order, in that alloy. Standard items ship from ready stock. Specials are made to order, and delivery runs 6-8 weeks. We'll confirm the alloy for each part on your quote.

Swagelok tube fitting in Hastelloy C-276

In wet-chlorine, sulfuric, and mixed-acid service, Crestflo matches the Swagelok fitting in Hastelloy C-276 / C-22. A direct equivalent, nothing more and nothing less. For more, see the Hastelloy C-276 tube fittings page and the Hastelloy C-276 material page.

Swagelok tube fitting in Super Duplex 2507

For high-chloride and offshore seawater duty, there's an equivalent available in Super Duplex 2507. See Super Duplex 2507 tube fittings and the material page.

Swagelok tube fitting in Inconel 625 / Incoloy 825

When it comes to high-temperature and sour-gas service, Crestflo matches the competition in Inconel 625 and Incoloy/Inconel 825. Take a look at Inconel 625 tube fittings and Inconel 825 tube fittings.

Swagelok tube fitting in Monel 400

For hydrofluoric acid work and marine applications, Monel 400 is the go-to equivalent. Check out Monel 400 tube fittings and the material page for more.

Swagelok tube fitting in 254 SMO, Alloy 20 & 904L

Sulfuric-acid and high-chloride process lines call for tougher alloys, and Crestflo covers that ground too, supplying equivalents in 254 SMO, Alloy 20, and 904L. Full specs live on the 254 SMO, Alloy 20, and 904L material pages.

Why the interchange is proven: ASTM F1387

This isn't a marketing claim. It's backed by a standard. Crestflo compression tube fittings are tested to ASTM F1387, the performance qualification standard for mechanically attached fittings, and that testing covers the exact dimensional and performance behavior that forms the basis for equivalence. That's what separates a documented, qualified equivalent from an uncontrolled marketplace "equivalent" listing with no proof behind it and no way to trace it. For more detail, see the ASTM F1387 interchange qualification page.

Interchange-proof summary

Interchange vs. intermix: the honest engineering note

Every specifying engineer asks this question, and the honest answer is the one that earns trust.

Interchange (correct): you replace a complete Swagelok fitting with a complete Crestflo fitting at the same location. Body, nut, both ferrules, all Crestflo. That's what "Swagelok equivalent" and "drop-in replacement" actually mean here.

Intermix (don't do this): pairing a Crestflo ferrule or nut with a Swagelok body, or the reverse, inside a single joint. Ferrule geometry and hardness are engineered together as a set. Mix components across brands within one joint and you risk compromising the seal. This isn't what "interchange" means.

Swagelok compatible fittings" or "is X compatible with Swagelok," the precise answer is this: use complete Crestflo fittings as interchange equivalents. Don't mix components within a single joint. Crestflo sticks to "interchange" and "equivalent" and steers clear of "compatible" or "intermix." That's not a semantic preference. It's a safety fact.

Why buyers switch to Crestflo

Crestflo is the alloy-aware alternative to Swagelok. Buyers don't switch on a whim, either; their reasons are specific:

• Drop-in replacement, dimensionally equal and backed by ASTM F1387, not a marketplace guess.
• Stainless steel and exotic alloys, Hastelloy, Super Duplex, Inconel, Monel, 254 SMO, Alloy 20, this is a range that stainless-only cross-references simply don't offer.
• 6-8 week delivery, a real contrast to the long lead times you'll often hit on specials from the majors. It's a genuine answer to "Swagelok long lead time alternative."
• Cost-competitive even after US duties/tariffs, the substantive answer to "cheaper than Swagelok."
• Small MOQ and private-label / OEM programs.
• Heat/lot number on every part with EN 10204 3.1 MTC as standard.
• ISO 9001 / 14001 / 45001 & PED certified.

Crestflo is the instrumentation arm of a Government-of-India-recognized export house with four decades behind it, plus a track record of delivering into the Middle East. There's real manufacturing heritage here, channeled into a brand built specifically to serve US customers.

Origin: Indian. US and European melt are available on request, and every batch comes with full material traceability.

We Engineer Confidence.

Explore the core product line: Crestflo tube fittings and nut & ferrule sets.

Fitting types and geometry we equal

Unions, tees, elbows, crosses, reducers

Crestflo covers the full body catalog: union, tee, elbow, cross, and reducer. That's straight and reducing, both.

Male / female connectors, adapters, port connectors, bulkheads

Thread ends and adapter ends are both covered here: male connector, female connector, tube adapters, port connector, and bulkhead union. All come in NPT and custom threads.

Caps, plugs, nuts and ferrules

Line-termination and sealing components, cap, plug, and nut & ferrule sets, come as complete Crestflo sets. Front ferrule, back ferrule, and nut are engineered as a matched trio. Order them together, not as intermixed parts.

Metric and imperial size parity

Crestflo builds every equivalent in both imperial and metric tube OD, all the way up to 2" (50 mm). So a "Swagelok metric tube fitting equivalent" isn't a conversion exercise someone has to work through. It's a direct request, full stop.

How to request your Swagelok cross-reference

1. Send your Swagelok part numbers, a line-card export, a drawing, or a sample.
2. Tell us the alloy and size you need (or ask us to match what you run today).
3. We return the Crestflo equivalent, alloy availability, and quote, typically for delivery in 6–8 weeks.

Buyer paths differ by who's asking. Distributors work through the line-card or stocking program. Equipment manufacturers send a print for made-to-print interchange. OEMs get the private-label program. End users, MRO, and EPC buyers file an RFQ or request a sample. Every path, though, starts in the same place: the RFQ form.

The RFQ form asks for five things: name, company name, email, phone, and a description of the requirement.

Get your Swagelok® cross-reference and quote → · Or reach out to Crestflo directly: sales@crestflousa.com · +1 346 594 9005 · Houston, TX.

Other brand tube-fitting cross-references

Not a Swagelok user? Crestflo has interchange guides for the rest of the instrumentation category too:

• Parker A-Lok cross-reference
• Hy-Lok cross-reference
• Fitok cross-reference
• Hoke cross-reference · Gyrolok cross-reference
• DK-Lok cross-reference · Superlok cross-reference
• All brand interchange guides · Master interchange chart

Related: Swagelok alternative · Swagelok vs Crestflo.

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