FITOK Cross-Reference: Interchange & Equivalents for Instrumentation Tube Fittings and Valves
A FITOK cross-reference lines up FITOK® twin-ferrule tube fittings and instrumentation valves with a dimensionally equivalent, standards-qualified Crestflo part. That means you can requote, dual-source, or swap a line item on your bill of materials without redesigning the fluid system. No redraws, no re-engineering. Crestflo builds those equivalents in stainless steel, plus high-nickel and other exotic corrosion-resistant alloys, and the tube-fitting interchange is backed by ASTM F1387 performance qualification, not just asserted.
On this page, "FITOK cross-reference" refers specifically to instrumentation-grade stainless-steel and alloy twin-ferrule tube fittings and instrumentation valves. It doesn't cover plumbing or copper compression fittings, and it doesn't cover electrical wire ferrules. FITOK® is a trademark of its respective owner. Swagelok® belongs to Swagelok Company. Crestflo makes interchangeable equivalents independently, and it isn't affiliated with, authorized by, or endorsed by FITOK.
How to Read This FITOK Interchange: Equivalent, Not "Compatible"
Crestflo fittings, when they interchange, offer form, fit, and function equivalence: a fitting that matches the FITOK tube outside diameter, ferrule geometry, thread, and pressure envelope, so it drops straight into the same port or tube run. That's not the same as mixing a Crestflo ferrule with a FITOK body inside one joint. No manufacturer stands behind that practice. Crestflo sticks to the words "interchange" and "equivalent" on purpose, and steers clear of "compatible," "intermix," or "genuine FITOK." Tube fitting equivalence rests on ASTM F1387 compression-tube-fitting performance qualification. Instrumentation valves, meanwhile, are qualified to ASME B16.34 and the applicable API standards.
FITOK Cross-Reference Chart: Request Your Part-Number Interchange
Rather than handing you a generic FITOK-to-Crestflo conversion chart, Crestflo builds the cross-reference around the actual FITOK part numbers on your BOM. Send over the FITOK part numbers, tube sizes, thread ends, and alloys you currently spec. The engineering team sends back matched Crestflo equivalents, with the interchange basis noted for each line.
This way, every crossover number gets checked against an actual drawing, never just guessed. Request your FITOK cross-reference, or start from Crestflo's cross-reference tool. For other brands, check the full instrumentation fitting cross-reference hub.
FITOK Product Families We Cross-Reference: Fittings, Ferrules & Valves
Crestflo works through the entire FITOK instrumentation range, family by family, matching every tube fitting equivalent to its Crestflo counterpart:
- Twin-ferrule (two-ferrule) tube fittings. Crestflo offers unions, elbows, tees, crosses, connectors, adapters, reducers, caps, and plugs in stainless twin-ferrule tube fittings, sized up to 2" (50 mm) OD.
- Ferrules and nuts. Hardened and non-hardened, single and double, available as replacement ferrules. For a look at the geometry, see single vs double ferrule.
- Instrumentation valves. Needle, ball, check, and 2/3/5-way manifold valves make up the instrumentation valve range, running from 1/16" to 1", with threaded or tube-fitting ends.
- Thread and pipe adapters, matching the FITOK end configurations enumerated below.
The scope is instrumentation SS and alloy fittings and valves; FITOK compression fittings for plumbing or copper service are outside it.
Connection & Thread Parity: NPT, BSP, JIC, SAE, Metric & Tube-OD
Whatever FITOK configuration shows up on a bill of materials, Crestflo has it covered. The same end and thread options come in both imperial and metric.
| Thread / End Type | Standard | Sizes |
|---|---|---|
| NPT tapered pipe | ASME B1.20.1 | 1/16"–2" |
| NPTF dryseal | ASME B1.20.3 | 1/16"–2" |
| BSPT / BSPP | ISO 7 / ISO 228 | 1/8"–2" |
| ISO parallel | ISO 228 | 1/8"–2" |
| JIC 37° flare | SAE J514 / ISO 8434-2 | 1/8"–2" OD |
| SAE O-ring boss (ORB) | SAE J1926 | per standard |
| Tube OD, imperial | fractional | 1/16"–2" |
| Tube OD, metric | metric | 1.5–50 mm |
| Socket-weld / butt-weld | ASME B16.11 / weld end | per drawing |
Values per applicable standard; customizable to requirement.
Alloy Availability: Where the Crestflo Equivalent Goes Beyond the Catalog
You can get that same interchange geometry in stainless steel, but also in exotic corrosion-resistant alloys that most standard instrumentation catalogs simply don't stock. That's often the reason buyers go looking beyond FITOK in the first place. Where applicable, alloys are supplied to NACE MR0175 / ISO 15156 for sour service, complete with material traceability.
| Alloy | UNS | Family | Material page |
|---|---|---|---|
| 316 / 316L | S31600 / S31603 | Austenitic stainless | 316/316L |
| 904L | N08904 | Super-austenitic | 904L |
| Duplex 2205 | S32205 | Duplex | Duplex 2205 |
| Super Duplex 2507 | S32750 | Super duplex | Super Duplex 2507 |
| 254 SMO | S31254 | 6-Mo austenitic | 254 SMO |
| Alloy 20 | N08020 | Nickel-iron-chromium | Alloy 20 |
| Inconel 625 | N06625 | Nickel | Inconel 625 |
| Monel 400 | N04400 | Nickel-copper | Monel 400 |
| Hastelloy C-276 | N10276 | Nickel-molybdenum | Hastelloy C-276 |
| Titanium Gr2 | R50400 | Titanium | Titanium Gr2 |
UNS designations follow the published alloy registries. The line also comes in 304/304L, Inconel 600/601/718/825, Incoloy 800/800H/825, Monel K500, Hastelloy C-22/B-2/B-3/X, and Nickel 200/201.
The Interchange Proof: ASTM F1387 & ASME B16.34
A genuine FITOK equivalent doesn't rest on a marketing claim; it rests on published qualification. Crestflo compression tube fittings are performance-qualified to ASTM F1387, the standard for mechanically attached fittings that covers pressure, impulse, vibration, rotary flexure, and pull-out. Instrumentation valves are designed and qualified to ASME B16.34 and the applicable API standards. Every part carries a heat or lot number for traceability. EN 10204 3.1 material test certificates are standard, and 3.2 certificates are available on request through material traceability. Sour-service alloys meet NACE MR0175 / ISO 15156.
Standards & Certifications Behind the Cross-Reference
Crestflo holds ISO 9001, ISO 14001, ISO 45001, and PED certification, along with the standard approvals tied to each product line: ASTM F1387 and NACE for fittings, ASME B16.34 and API for valves. The quality team keeps certificates on file and can provide them on request; the content pages themselves state conformance rather than listing certificate numbers. The manufacturing program doesn't stop there. It also covers hydraulic proof, burst, and impulse testing, pneumatic and vacuum testing, thermal cycling, PMI, and in-house NDT. Destructive testing happens at ISO/IEC 17025-accredited laboratories, and third-party inspection is available on request.
Why Crestflo for a FITOK Cross-Reference
Crestflo operates as the instrumentation division of an export house that's been in business for four decades and carries Government-of-India recognition. That parent company has built a proven delivery record across the Middle East. The newer manufacturing brand stands on that heritage. For a FITOK interchange, this matters in a few ways:
- Dimensional equivalents substantiated by ASTM F1387 (fittings) and ASME B16.34 (valves), not asserted.
- Alloy depth from 316L to Hastelloy, Monel, and Titanium, beyond a standard catalog.
- Availability framing: standard items ship from ready stock, specials are made to order, and lead time runs 6-8 weeks. Details are on the lead time page.
- Indian-origin material, with US or European melt available on request, and full traceability behind every batch. Crestflo lays this out on the US-origin compliance page.
- Low MOQs, plus a private-label / OEM program built for distributors and equipment builders.
We Engineer Confidence.
Request a FITOK Cross-Reference Quote
Send in the FITOK references that need matching, and the engineering team will send back the Crestflo equivalents. End users, EPC contractors, and panel fabricators can request a quote or request a sample. Distributors have their own path: browse the distributor program or become a distributor outright. OEMs should begin with the private-label program. Reach the US team at sales@crestflousa.com or +1 346 594 9005, based in Houston, TX.
FITOK Cross-Reference FAQ
What is the Crestflo equivalent to FITOK® fittings?
Crestflo builds twin-ferrule tube fittings and instrumentation valves, all dimensionally interchangeable, across stainless and exotic alloys. The tube-fitting interchange is performance-qualified to ASTM F1387. Valves carry the same qualification under ASME B16.34. Send over your FITOK reference, and you'll get the matched Crestflo equivalent back from the engineering team.
Are FITOK and Crestflo fittings interchangeable?
They're dimensionally interchangeable with tube fittings qualified to ASTM F1387, matching in form, fit, and function. That doesn't mean swapping ferrules from two different brands inside one joint. It means a Crestflo part that fits into the same tube run or port.
Do you publish a FITOK part-number cross-reference chart?
Crestflo won't publish invented crossover numbers. Instead, the company maps your specific FITOK part numbers to Crestflo equivalents only when you ask. Submit the request-a-quote form, or run the cross-reference tool, and the engineering team sends back verified matches.
Is there a FITOK catalog or PDF cross-reference?
This cross-reference lives online as HTML, not behind a locked catalog PDF. Send over any item from a FITOK catalog, part number, tube size, thread end, alloy, and Crestflo's engineering team will match it to the equivalent part. They do this through the cross-reference tool or the request-a-quote form. No file to download, no gate to get past. Just a verified match.
What alloys can I get the FITOK equivalent in?
316/316L, 904L, 2205 duplex, 2507 super duplex, 254 SMO, Alloy 20, Inconel, Monel, Hastelloy, and Titanium Gr2 round out the list, among others. These specs often fall outside a standard instrumentation catalog. Sour-service applications call for grades rated to NACE MR0175.
Is the interchange proven or just claimed?
Tube fittings interchange under ASTM F1387 performance qualification, and valves carry ASME B16.34 certification. Heat-number traceability comes standard, along with EN 10204 3.1 material test certificates. A 3.2 certificate is available on request.
Who makes the fittings, where are they made, and what is the country of origin?
Crestflo builds these as an independent manufacturer, producing interchangeable equivalents rather than licensed copies. The standard product line comes from India. US or European melt is available on request, and every batch carries full material traceability. Origin details and TAA considerations aren't glossed over. They're laid out plainly on the US-origin compliance page.
What is the lead time for a FITOK equivalent?
Standard items ship from stock, ready to go. Specials are made to order, and it's a 6-8 week wait. MOQs stay small, with private-label options open to distributors and OEMs.
Can you cross-reference FITOK instrumentation valves too?
Yes. We build needle, ball, check, and 2/3/5-way manifold valves in sizes from 1/16" to 1", available in metric or imperial, with threaded or tube-fitting ends. They're qualified to ASME B16.34 and the applicable API standards.
Can you cross-reference FITOK and Swagelok fittings?
Yes. FITOK and Swagelok® both rely on twin-ferrule instrumentation geometry, which is why Crestflo cross-references either brand to a dimensionally equivalent, ASTM F1387-qualified part. If your bill of materials has FITOK references, use this page. If it has Swagelok references, start from the Swagelok cross-reference instead. Whether a given FITOK and Swagelok pair is truly interchangeable comes down to the exact tube OD, ferrule, and thread configuration, so send over the part numbers and the engineering team will confirm each match. Want a spec-by-spec "FITOK vs Swagelok" comparison, or an answer to "is FITOK as good as Swagelok"? The FITOK vs Crestflo page lays out how a Crestflo equivalent measures up against both. Swagelok® is a trademark of Swagelok Company. Crestflo is an independent manufacturer, not affiliated with, authorized by, or endorsed by either brand.
Is Crestflo affiliated with FITOK?
No. FITOK® belongs to its own trademark holder. Crestflo makes interchangeable equivalents independently, and it has no affiliation with FITOK, no authorization from them, and no endorsement either.