Tube Fitting Cross-Reference & Interchange: Crestflo Instrumentation Equivalents
> Trademark & independence notice: All brand names on this page, Swagelok®, Parker®, A-Lok®, CPI™, GyroLok®, Hy-Lok®, Hoke®, FITOK®, DK-Lok®, Ham-Let®, Superlok®, Tylok®, SSP® and Brennan®, are trademarks of their respective owners. Crestflo is not affiliated with, authorized by, sponsored by, or endorsed by any of them. Every reference is nominative, used only to identify the parts you already specify so you can find the dimensionally equivalent Crestflo fitting. Crestflo supplies independently manufactured equivalents, not genuine OEM parts.
A tube-fitting cross-reference maps a named-brand instrumentation compression fitting to a dimensionally interchangeable Crestflo equivalent, qualified for performance per ASTM F1387, so you can source the same form, fit and function from a US-serving manufacturer. This hub explains how instrumentation-fitting interchange works, then routes every brand and every buyer to the right per-brand page and an RFQ.
Request your cross-reference & quote → · Send a part list, a print or a sample, the Crestflo Engineering Team returns the interchange equivalent, the alloys it ships in, and a quote.
Scope: cross-reference here means instrumentation tube-fitting interchange, compression, single- and double-ferrule, flare and cone-and-thread fittings in stainless steel and alloy. It is not hydraulic hose-end / JIC adapter cross-reference, and not plumbing, copper or electrical fittings. "Ferrule" means a fluid-system compression ferrule, not a wire ferrule.
Also known as: interchange, equivalent, x-ref & conversion terms
Buyers describe this task with many phrasings, and all of them resolve to the same instrumentation interchange. This entity is also specified as a tube fitting cross reference (or cross-reference / crossreference / x-ref / xref), a tube fitting interchange, an interchange chart or interchange guide, a tube fitting equivalent or equivalent chart, a fitting conversion chart, a competitor cross reference, a part-number cross reference, a "same-as" chart, a drop-in replacement or a form-fit-function equivalent. In the instrumentation category it also appears as an instrument fitting equivalent, a compression fitting cross reference, a double-ferrule fitting equivalent, a single-ferrule fitting equivalent, a 316 tube fitting equivalent, an SS tube fitting cross reference and a stainless steel tube fitting cross reference. Whichever wording appears on your bill of materials, the underlying request is identical: the Crestflo part that dimensionally interchanges with the brand fitting you run today.
How instrumentation-fitting interchange works (ASTM F1387 basis)
Dimensional interchange means a Crestflo fitting mates to the same tube outside diameter, threads to the same end connections, and delivers equivalent form, fit and function as the referenced brand design, ferrule geometry, nut thread, hex and gland/body port all matching the original. Crestflo builds to the two-ferrule geometry and the imperial-and-metric sizing conventions the majors use, which is what makes a location-for-location swap possible.
Crestflo goes beyond a size spreadsheet: its compression tube fittings are tested to ASTM F1387, the Standard Specification for Performance of Piping and Tubing Mechanically Attached Fittings, the recognized basis for a documented, qualified interchange claim rather than an uncontrolled marketplace "equivalent." Interchange is available with single and double ferrules, hardened or non-hardened to requirement, in both imperial and metric sizes. Read the standard in depth on the ASTM F1387 interchange qualification page.
A precise engineering distinction matters here. Interchange means replacing a complete brand fitting with a complete Crestflo fitting at the same location, body, nut and both ferrules are Crestflo. Intermixing, combining a Crestflo ferrule or nut with another brand's body inside a single joint, is not what interchange means and is not recommended; ferrule geometry and hardness are engineered as a set. Crestflo uses "interchange" and "equivalent," never "compatible" or "intermix," because the distinction is a sealing-integrity fact. See mixing tube fitting brands and single vs double ferrule.
Interchange criteria, what must match
| Criterion | What must match | Crestflo basis |
|---|---|---|
| Tube outside diameter | Same nominal OD, imperial or metric | Built to standard OD tables; up to 2″ (50 mm) |
| Ferrule geometry | Single- or double-ferrule set that grips the same OD | Single & double ferrule; hardened or non-hardened |
| Nut thread & hex | Same nut thread form and pull-up behavior | Matched nut/ferrule set supplied complete |
| Gland / body port | Same port and shoulder geometry | Built to the referenced design |
| End-connection thread | NPT (ASME B1.20.1), metric or custom thread | Tube, NPT and adapter ends |
| Performance qualification | Documented performance, not size alone | Tested to ASTM F1387 |
Instrumentation brands Crestflo cross-references
This is the routing core of the hub. Each brand has its own cross-reference page, plus an "alternative" and a "vs Crestflo" comparison where those exist, with the alloy availability, ferrule and connection parity notes, and RFQ path for that specific line.
A parker cross reference may point to either the A-Lok (double-ferrule) or the CPI (single-ferrule) line, start with the family you buy today, or send your part numbers and we identify it.
Interchange in stainless AND exotic alloys: the differentiator
Most competitor cross-reference charts stop at 316 stainless or brass. Crestflo's interchange advantage is alloy breadth: the same dimensionally equivalent fitting is available in 304/316/904L and the full corrosion-resistant and nickel-alloy range plus Titanium Gr2, the materials instrumentation buyers in sour, high-chloride and high-temperature service actually specify. The material page for each alloy educates on the grade; the fitting ships as an instrumentation form.
| Alloy family | Example grades (UNS) | NACE MR0175 / ISO 15156 | Typical service driver |
|---|---|---|---|
| Austenitic stainless | 316/316L (S31600/S31603), 304/304L (S30400/S30403), 904L (N08904) | Available | General process, instrument air, moderate chloride |
| Duplex / super-austenitic | Duplex 2205 (S32205), Super Duplex 2507 (S32750), 254 SMO (S31254), AL-6XN (N08367), Alloy 20 (N08020) | Available | High chloride, seawater, sulfuric acid |
| Nickel alloys | Inconel 625 (N06625), Incoloy 825 (N08825), Monel 400 (N04400), Hastelloy C-276 (N10276) | Available | Sour gas, wet chlorine, mixed acids, high temperature |
| Titanium | Grade 2 (R50400) | Available | Seawater, oxidizing chlorides |
UNS numbers are standard published designations. Alloys per applicable material standard; customizable to requirement. Per-part alloy confirmation is provided with your quote. Explore 316/316L, Super Duplex 2507, Inconel 625, Monel 400 and Hastelloy C-276, or use the alloy selector and the sour-service (NACE) selection guide.
The master interchange chart & part-number lookup
Two routes handle the exact part-number question. The master interchange chart consolidates the brand mappings in one place, and the interactive cross-reference lookup tool lets you search from a part number or a size, a 1/4" or 6 mm OD, a series or a competitor part number. Because accurate mapping must be verified against your exact series, size and material, Crestflo builds your cross-reference to order rather than publishing an unverified generic parts table, so every equivalent is correct to your bill of materials. You can also build the equivalent part number with the configurator.
Why cross-reference to Crestflo
Crestflo is the alloy-aware, F1387-backed interchange, and the reasons buyers move are specific.
| Buyer need | Crestflo answer |
|---|---|
| Proof the interchange is real | Dimensional and performance interchange, tested to ASTM F1387 |
| Faster than OEM specials | Ready stock for standard items · made-to-order for specials · 6–8 week delivery |
| Alloys beyond 316 | 304/316/904L plus Duplex, 254 SMO, AL-6XN, Alloy 20, Inconel, Monel, Hastelloy, Titanium Gr2 |
| Sizes & ferrule options | Imperial and metric to 2″ (50 mm); single & double ferrule; hardened or non-hardened |
| Traceability | Heat/lot number on every part; EN 10204 3.1 MTC standard (3.2 on request) |
| Volume & branding | Small MOQ; private-label and made-to-print programs |
| Landed cost | Cost-competitive after US duties/tariffs |
Crestflo is the instrumentation division of a four-decade, Government-of-India-recognized export house with a Middle-East delivery track record, established manufacturing heritage behind a focused US-serving instrumentation brand. Origin: Indian origin; US / European melt available on request, with full material traceability. QA is ISO 9001 / 14001 / 45001 & PED certified, and the applicable fitting approvals, ASTM F1387 and NACE MR0175 / ISO 15156, are held for this product type. We Engineer Confidence.
Buyer paths: distributors → line card / distributor program; OEMs → private-label program; equipment manufacturers → send a print for made-to-print interchange; end users, MRO & EPC → RFQ or sample. All routes start at the RFQ form.
Legal, trademark & non-affiliation
Every brand named here is a trademark of its respective owner, used nominatively to identify the parts you already specify. Crestflo is not affiliated with, authorized by, sponsored by, or endorsed by any listed manufacturer, and sells Crestflo-manufactured parts, not OEM parts. Interchange claims are made on a dimensional and performance (ASTM F1387) basis and are factual. Crestflo does not use "compatible," "intermix," "genuine" or "OEM" to describe its equivalents.
FAQ
What is a tube-fitting cross-reference?
It maps a named-brand instrumentation fitting to a dimensionally interchangeable Crestflo equivalent, so you can source the same form, fit and function from a US-serving manufacturer. Send your part list and the Crestflo Engineering Team returns the equivalent, the alloys it ships in, and a quote.
Are tube fittings from different brands interchangeable?
Component-level interchange is possible when the tube OD, ferrule geometry, nut thread and gland dimensions match. Crestflo qualifies its interchange to ASTM F1387, dimensional and performance, not just a size chart. Replace a complete brand fitting with a complete Crestflo fitting; do not intermix components inside a single joint.
Which brands do you cross-reference?
Swagelok®, Parker® A-Lok® and CPI™, GyroLok®, Hy-Lok®, Hoke®, FITOK®, DK-Lok®, Ham-Let®, Superlok®, Tylok®, SSP® and Brennan®, each with its own per-brand cross-reference page.
Is Crestflo affiliated with Swagelok, Parker or the other brands?
No. Those names are trademarks of their respective owners; Crestflo is not affiliated with, endorsed by, or sponsored by any of them. Crestflo manufactures interchangeable equivalents, not OEM parts.
Can I get the equivalent in exotic alloys, not just 316?
Yes, equivalents are available in 304/316/904L and the corrosion-resistant and nickel range (Duplex, Super Duplex 2507, 254 SMO, AL-6XN, Alloy 20, Inconel, Monel, Hastelloy) plus Titanium Gr2, including NACE MR0175 / ISO 15156 service.
Do you offer both imperial and metric, single and double ferrule?
Yes, imperial and metric sizes to 2″ (50 mm) OD, single and double ferrule, hardened or non-hardened to requirement.
How do I find the exact equivalent part number?
Use the master interchange chart or the interactive lookup tool, or send your part list, print or sample and the Crestflo Engineering Team returns a verified cross-reference. Crestflo builds the mapping to your bill of materials rather than publishing a generic table.
What is the lead time versus the OEM?
Ready stock for standard items · made-to-order for specials · 6–8 week delivery, with small MOQ and private-label options, a real answer to the long lead times common on OEM specials.
What certifications and traceability come with the equivalent?
QA is ISO 9001 / 14001 / 45001 & PED certified; every part carries a heat/lot number with EN 10204 3.1 MTC standard (3.2 on request). Fittings are tested to ASTM F1387 and available to NACE MR0175. Datasheets and CAD are available to customers on request.
Are these "made in USA"?
No. Crestflo is a US-serving manufacturer engineered for US drop-in interchange. Origin: Indian origin; US / European melt available on request with full material traceability. TAA/DFARS domestic-melt options are handled on the US-origin & compliance page.
Do you cross-reference hydraulic hose-end or JIC adapters?
No, this hub covers instrumentation tube fittings (compression, ferrule, flare, cone-and-thread). Hydraulic hose-end / JIC hose adapters are outside the instrumentation scope.
Can you private-label the equivalent for our brand?
Yes, private-label and made-to-print programs are available. See private label and custom manufacturing.
Send your BOM: get a Crestflo cross-reference
Send your competitor part list, a line-card export, a drawing or a sample. The Crestflo Engineering Team returns the Crestflo interchange equivalent, the alloys it ships in, and a quote, no login, no gated tool.
RFQ form fields: Name · Company name · Email · Phone · Requirement description.
Request your cross-reference & quote → · Request a sample · Distributor line card · Or contact Crestflo: sales@crestflousa.com · +1 346 594 9005 · Houston, TX.
Related resources
- Master interchange chart · Cross-reference lookup tool
- Single vs double ferrule · Mixing tube fitting brands
- Instrumentation tube fittings · Nut & ferrule sets
- ASTM F1387 · NACE MR0175 · EN 10204 MTC
- Instrumentation fitting materials · Alloy selector
All brand names are trademarks of their respective owners and are used nominatively to identify equivalent parts. Crestflo is not affiliated with, authorized by, or endorsed by any listed manufacturer, and supplies independently manufactured dimensional equivalents. Origin: Indian origin; US / European melt available on request, with full material traceability.