Hy-Lok® Tube Fitting & Valve Cross-Reference to Crestflo Equivalents
A Hy-Lok cross-reference lines up a Hy-Lok® twin-ferrule instrumentation part, whether a tube fitting, ferrule set, or instrumentation valve, with the dimensionally interchangeable Crestflo equivalent you can specify and buy instead. Crestflo builds twin-ferrule instrumentation fittings and valves designed to interchange with the Hy-Lok® envelope. Tube-fitting interchange is qualified to ASTM F1387. Valves are built to the applicable ASME B16.34 / API basis. Materials span 316L through exotic alloys.
This cross-reference covers instrumentation twin-ferrule tube fittings and instrumentation valves only. It doesn't cover hydraulic or JIC couplings, plumbing compression fittings, or electrical wire ferrules.
Hy-Lok® is a registered trademark held by Hy-Lok Corporation. Crestflo, by contrast, manufactures interchangeable equivalents independently, with no affiliation to Hy-Lok, no endorsement from Hy-Lok, and no sponsorship arrangement of any kind. Genuine Hy-Lok parts aren't something Crestflo sells.
Request your Hy-Lok cross-reference: send in your Hy-Lok part list or BOM, and the Crestflo engineering team will send back the matching equivalents along with an RFQ. Request a quote.
Hy-Lok Interchange Is Also Called a Cross Reference, Conversion Chart or Equivalent
People search for this same mapping under a dozen different labels, but they're all asking about the same thing: how a Hy-Lok part lines up with its Crestflo equivalent. Some call it a Hy-Lok cross reference. Others say cross-reference chart, interchange, interchange chart, conversion chart, equivalent, or replacement. Spelling gets loose too, showing up as "hy lok" and "hylok" just as often as the hyphenated version. The brand name itself shifts depending on who's typing: Hy-Lok, Hy-Lok Corporation (the manufacturer based in Busan, South Korea), or one of its distribution arms, Hy-Lok USA and Hy-Lok Canada. Whether someone types "hy-lok part number cross reference" or hunts for a "hy-lok cross reference pdf," the goal never changes. They want the Crestflo part that drops straight in for a given Hy-Lok item.
How the Hy-Lok to Crestflo Interchange Works: Twin-Ferrule Geometry & Thread Parity
Twin-ferrule (double-ferrule) instrumentation fittings seal through a defined geometric envelope: tube outside diameter, front- and back-ferrule profile, nut thread, and body bore. When those dimensions line up, two fittings interchange, and the assembly grips and seals on the same tube. Crestflo builds its twin-ferrule fittings to the Hy-Lok dimensional envelope. It verifies performance against ASTM F1387, too. That's why a Crestflo body, nut, and ferrule set makes up onto your existing tube the way the original does.
The match here is dimensional, not a shared catalog, so the right term is interchange or equivalent, never "compatible" or "intermix." Crestflo doesn't recommend mixing ferrules or components across brands within a single made-up connection. Interchange applies to both imperial (fractional) and metric tube sizes on all fittings, covering tube OD up to 2" (50 mm). End connections include NPT, NPTF, BSPT, BSPP, ISO-parallel, JIC 37°, SAE-ORB, socket-weld, butt-weld, and tube-OD ends. Ferrules come hardened or non-hardened, depending on requirement. Before converting, always check the specific part against your service conditions.
Request Your Hy-Lok Part-Number Cross-Reference Chart
Crestflo doesn't keep a fixed public part-number table. Instead, it publishes validated equivalents part by part, so the mapping you get back matches your actual Hy-Lok designations, sizes, alloys, and end connections. Send over the Hy-Lok part numbers or the full BOM, and the engineering team returns a same-part interchange chart, plus an RFQ. Need to cross-reference several brands at once, say Swagelok, Parker, Hoke, Fitok, DK-Lok, and others? Use the master multi-brand interchange chart, or try the cross-reference lookup tool.
Hy-Lok Product Families Cross-Referenced: Tube Fittings, Ferrules & Instrumentation Valves
In the instrumentation scope, each Hy-Lok family lines up with a matching Crestflo product.
| Hy-Lok family | Crestflo equivalent | Size range | Interchange basis |
|---|---|---|---|
| Twin-ferrule tube fittings | Twin-ferrule tube fittings | Tube OD to 2" (50 mm) | ASTM F1387 |
| Single-ferrule fittings | Single-ferrule tube fittings | Tube OD to 2" (50 mm) | ASTM F1387 |
| Nut & ferrule sets | Nut and ferrule | Per tube OD | Dimensional |
| Needle valves | Needle valves | 1/16"–1" | ASME B16.34 / API |
| Ball valves | Ball valves | 1/16"–1" | ASME B16.34 / API |
| Check valves | Check valves | 1/16"–1" | ASME B16.34 / API |
| Manifold & gauge/bleed valves | Instrumentation valves | 2/3/5-way | ASME B16.34 / API |
| Quick-connects | Quick-connect fittings | Per series | Dimensional |
Tube fittings and ferrules swap out on the ASTM F1387 compression-tube-fitting basis. Instrumentation valves don't qualify under F1387, though. They meet the valve standards suited to their type: ASME B16.34 and the relevant API test standards.
Hy-Lok Fitting Alloys: 316L Stainless Through Hastelloy, Inconel, Monel & Duplex
Hy-Lok stock runs 316 stainless as a rule. Crestflo interchange covers the full corrosion-resistant-alloy range instead, and that's what sets it apart for sour, cryogenic, offshore, and high-halide service.
| Alloy | UNS | Crestflo instrumentation forms | Material page |
|---|---|---|---|
| 316 / 316L | S31600 / S31603 | Fittings, valves, tubing | 316/316L |
| 904L | N08904 | Fittings, valves | 904L |
| Super Duplex 2507 | S32750 | Fittings, valves, tubing | Super Duplex 2507 |
| Hastelloy C-276 | N10276 | Fittings, valves, tubing | Hastelloy C-276 |
| Inconel 625 | N06625 | Fittings, valves, tubing | Inconel 625 |
| Monel 400 | N04400 | Fittings, valves, tubing | Monel 400 |
Also available in 304/304L, Duplex 2205, 254 SMO, AL-6XN, Alloy 20, Inconel 600/601/718/825, Incoloy 800/825, Monel K500, Hastelloy C-22/B-2/B-3/X, Nickel 200/201, and Titanium Gr2. UNS designations follow the standard published values. Alloy availability applies only to instrumentation fittings, valves, and tubing forms. Crestflo doesn't supply bar, sheet, plate, or mill products.
ASTM F1387: The Standards-Based Proof Behind a Hy-Lok Interchange Claim
An interchange claim only holds up if the proof behind it does. Crestflo qualifies twin-ferrule tube fittings to ASTM F1387, the performance standard for compression tube fittings. That means hydraulic proof testing, burst and impulse pressure testing, pull-out testing, vibration testing, and thermal cycling. None of that comes from a sales pitch. It's objective, dimensional, standards-based qualification, tested to F1387, that backs a Hy-Lok-to-Crestflo interchange for the fitting families.
| Test / credential | Basis |
|---|---|
| Compression-fitting performance | ASTM F1387 |
| Valve qualification | ASME B16.34 / API |
| Sour-service compliance | NACE MR0175 / ISO 15156 |
| Material traceability | EN 10204 3.1 standard; 3.2 on request; heat/lot number on every part |
| Verification | PMI, in-house NDT, third-party inspection on request |
Values follow the applicable standard, and they're customizable to your requirements. For more, check the ASTM F1387 standard page, NACE MR0175, EN 10204 MTC, traceability, and testing & inspection pages. Crestflo carries ISO 9001, 14001, and 45001 certification, plus PED certification.
Is Hy-Lok Interchangeable With Swagelok or Crestflo?
Hy-Lok, Swagelok, and Crestflo all build twin-ferrule instrumentation systems to comparable dimensional envelopes. That means their fittings can interchange, provided the tube OD, thread, and ferrule geometry line up. Crestflo takes the guesswork out of this by qualifying its equivalents to ASTM F1387 against the Hy-Lok envelope for fittings, and to ASME B16.34 / API for valves. Before converting, always confirm interchange on the specific part and service. Components shouldn't be mixed within a single made-up connection.
Crestflo also publishes a Swagelok cross-reference, plus a master interchange chart for multi-brand conversions.
Request Your Hy-Lok Cross-Reference & Interchange Quote
Send us your Hy-Lok part list or BOM, and we'll turn it into a same-part interchange chart along with an RFQ. No dead ends, no obligation. Reach the Crestflo engineering team at sales@crestflousa.com or +1 346 594 9005 (Houston, TX).
- Request a quote, same-part Hy-Lok interchange RFQ
- Request a sample, validate the fit before you convert
- Cross-reference lookup tool, check equivalents online
- Hy-Lok alternative and Hy-Lok vs Crestflo: the case for switching, laid out feature by feature
Datasheets and CAD models are available to customers on request.
Why Crestflo for Hy-Lok Interchange
Crestflo runs as the instrumentation division of an export house that's been in business for four decades and carries Government-of-India recognition. It has built a long track record delivering across the Middle East, and now it's turned its attention to US buyers with a drop-in interchange program. That promise isn't built on stock claims. It rests on real capability:
- ASTM F1387-qualified fittings and ASME B16.34 / API-qualified valves, the objective interchange proof.
- Both imperial and metric sizes on every fitting, matching the Hy-Lok envelope in tube OD to 2" (50 mm).
- Exotic-alloy depth: 316L, Hastelloy, Inconel, Monel, Duplex, and Titanium, well beyond what a typical distributor keeps on the shelf.
- Heat-number traceability on every part with EN 10204 3.1 MTC (3.2 on request).
- Small MOQs and private label: factor in tariffs, and US buyers still come out ahead on cost. Details sit on the post-tariff cost advantage page.
- Standard items ship from ready stock; specials are made to order. Delivery typically runs 6-8 weeks. Full specifics are on the lead time page.
- Material originates in India, though US and European melt is available on request. Every lot carries full traceability. Origin details and TAA options are laid out plainly on the US-origin compliance page.
We Engineer Confidence.
Frequently Asked Questions About Hy-Lok Cross-Reference
Are Hy-Lok and Crestflo fittings interchangeable?
Yes. Crestflo twin-ferrule fittings are built to interchange dimensionally with Hy-Lok® parts, and they're qualified to ASTM F1387. Matching instrumentation valves meet ASME B16.34 / API. Always check the specific part and service before converting, and never mix components within a single connection.
Are Swagelok and Hy-Lok interchangeable?
Both systems use twin-ferrule instrumentation and share comparable dimensional envelopes. That means fittings can interchange, but only when tube OD, thread, and ferrule geometry all line up. Confirm each part individually. Crestflo's published F1387-qualified equivalents for both lines, so check the Swagelok and master interchange charts for details.
How do I find the Crestflo equivalent to a Hy-Lok part number?
Send your Hy-Lok part number or full BOM to the Crestflo engineering team, and you'll get back the matching Crestflo equivalent along with an RFQ. Rather than publish a fixed public table, Crestflo validates equivalents part by part, so the cross-reference reflects your actual sizes, alloys, and end connections.
Do you sell genuine Hy-Lok parts?
No. Crestflo builds interchangeable equivalents on its own, as an independent manufacturer, with no tie to Hy-Lok Corporation. It isn't affiliated with the company, doesn't carry its endorsement, and receives no sponsorship from it. Hy-Lok® remains a registered trademark of Hy-Lok Corporation.
What alloys are available beyond 316L?
We stock 304/304L and 316/316L as our workhorse grades, along with 904L for tougher jobs. Duplex 2205 and Super Duplex 2507 cover the higher-strength, more corrosion-resistant end of the line. For truly aggressive environments, there's 254 SMO and AL-6XN, plus Alloy 20 where acid resistance matters most. On the nickel side, we carry Inconel 600/601/625/718/825, Incoloy 800/825, and Monel 400/K500. Then there's Hastelloy C-276/C-22/B-2/B-3/X, which covers several corrosion-resistant variants. Round out the lineup with Nickel 200/201 and Titanium Gr2. All of it's available as instrumentation fittings, valves, and tubing.
Are metric and imperial Hy-Lok sizes both available?
Yes. Crestflo covers both imperial (fractional) and metric sizes across every fitting it makes, with tube OD reaching up to 2" (50 mm). End connections keep pace too: NPT, BSPP, BSPT, ISO-parallel, JIC 37°, SAE-ORB, and weld, all matched to spec.
What proves the interchange will seal?
Tube fittings go through ASTM F1387 performance qualification: hydraulic proof, burst, impulse, pull-out, vibration and thermal-cycling tests. That's paired with PMI, NDT, and heat-number traceability backed by EN 10204 3.1/3.2 MTC documentation. Instrumentation valves, meanwhile, are qualified to ASME B16.34 and API.
What is the lead time and MOQ?
We keep ready stock on hand for standard items. Specials are made to order, and those run on a 6-8 week delivery cycle. MOQs are small, and private-label options are available too. As for the ready stock itself, it's held in India, and delivery follows that same 6-8 week timeline.
Are these NACE-compliant for sour service?
Compression fittings ship compliant with NACE MR0175 / ISO 15156 where specified. Alloy selection and material traceability are handled accordingly.
Can you cross-reference other brands too?
Use the master multi-brand interchange chart to cross-reference Swagelok, Parker, Hoke, Fitok, DK-Lok and others. Or, for a mixed BOM, just request a combined chart.