Parker CPI Single-Ferrule Tube Fitting Cross-Reference to Crestflo Equivalents
A Parker CPI cross-reference takes a Parker CPI™ single-ferrule instrumentation compression tube fitting and maps it to the dimensionally interchangeable Crestflo equivalent you specify and buy in its place. Crestflo builds single-ferrule instrumentation tube fittings engineered to the Parker CPI dimensional envelope. They're qualified to ASTM F1387. Materials run from 316/316L through exotic alloys, and sizes come in both imperial and metric.
CPI here means Parker's instrumentation single-ferrule compression tube fitting for fluid and gas systems, not chemical-process-industry (CPI) as a sector, and not a plumbing compression fitting.
CPI™ belongs to Parker Hannifin Corporation as a registered trademark. Crestflo builds interchangeable equivalents on its own, with no ties to Parker Hannifin, no authorization from them, and no endorsement either. Genuine Parker parts aren't something Crestflo sells.
Need a Parker CPI cross-reference? Send over your part list or BOM, and the Crestflo engineering team will send back the matching equivalents along with an RFQ. Request a quote.
Parker CPI Interchange Is Also Called a Cross Reference, Equivalent or Conversion Chart
Buyers land on this mapping through several different phrasings, but it's always the same relationship: a Parker CPI part and its Crestflo counterpart. People specify it as a Parker CPI cross reference, cross-reference chart, interchange chart, conversion chart, equivalent, replacement, or drop-in. Reversed word orders show up too, things like "cross reference Parker CPI" and "CPI Parker cross reference." The brand itself gets referenced under a handful of names as well: Parker CPI, CPI fittings, Parker CPI tube fittings, Parker instrumentation fittings, and Parker Fluid System Connectors. All of these trace back to Parker Hannifin Corporation. Part-number lookups such as "parker cpi part number cross reference," along with PDF-specific searches like "parker cpi cross reference pdf" and "parker cpi cross reference chart pdf," all resolve to one request in the end: find the Crestflo equivalent for a given Parker CPI item.
What Is a Parker CPI Fitting? The Single-Ferrule Instrumentation Compression Design
Parker Hannifin's CPI™ fitting is a single-ferrule instrumentation compression tube fitting built for gas and liquid systems. Three parts make it up: a body, a nut, and a single ferrule that swages onto the tube's outside diameter to grip and seal. Within Parker's instrumentation tube-fitting range, it's the single-ferrule option. Crestflo makes a single-ferrule fitting built on that same design principle, plus double-ferrule versions. That means a buyer switching over from CPI can match the single-ferrule format without any guesswork.
Parker CPI vs A-LOK: Single Ferrule Versus Twin Ferrule
Parker CPI uses a single ferrule. Parker A-LOK®, by contrast, is a twin-ferrule (double-ferrule) instrumentation tube fitting from Parker. These aren't interchangeable on the same envelope, so confirm which one you're holding before attempting a conversion. If you're working with A-LOK twin-ferrule parts, start with the Parker A-LOK cross-reference. To understand the design difference itself, see single vs double ferrule explained.
How the Parker CPI to Crestflo Interchange Works: Single-Ferrule Geometry & Thread Parity
A single-ferrule fitting seals through a defined geometric envelope: tube outside diameter, ferrule profile, nut thread, body bore. Match those dimensions, and two fittings interchange; the assembly grips and seals on the same tube. Crestflo builds its single-ferrule fittings to the Parker CPI dimensional envelope and verifies performance against ASTM F1387. The result: a Crestflo body, nut, and ferrule make up onto your existing tube just as the original does.
The match here is dimensional, not functional, so the right terms are interchange and equivalent. Never compatible. Never intermix. Don't mix components across brands within a single made-up connection. The Crestflo equivalent carries the tube's rated working pressure for the given OD and wall, per the applicable standard; Parker CPI pressure rating values follow that same standard and can be adjusted to fit the requirement. Interchange covers imperial (fractional) sizes and metric sizes alike, up to 2" (50 mm) OD. Before converting, always check the specific part against your actual service conditions.
Request Your Parker CPI Part-Number Cross-Reference Chart
Crestflo validates equivalents part by part rather than relying on a fixed public part-number table, so the mapping reflects your actual Parker CPI designations, sizes, alloys, and end connections. Parker's CPI part-number format follows a pattern built from a size code, a connector type, and a material suffix. Send in your Parker CPI catalog part numbers or your BOM, and the engineering team matches them against the Parker CPI fitting catalog designations. You'll get back a same-part interchange chart along with an RFQ. To cross-reference several brands at once, Swagelok, Parker A-LOK, Hoke, Fitok, DK-Lok and more are covered by the master multi-brand interchange chart or the cross-reference lookup tool.
Parker CPI Configurations Cross-Referenced: Connectors, Unions, Elbows, Tees & Ferrules
Within the instrumentation scope, every Parker CPI configuration has a matching single-ferrule equivalent from Crestflo.
| Parker CPI configuration | Crestflo equivalent | Size range | Interchange basis |
|---|---|---|---|
| Male connector | Male connector | Tube OD to 2" (50 mm) | ASTM F1387 |
| Female connector | Female connector | Tube OD to 2" (50 mm) | ASTM F1387 |
| Union / reducing union | Union | Tube OD to 2" (50 mm) | ASTM F1387 |
| Elbow (union / male / female) | Elbow | Tube OD to 2" (50 mm) | ASTM F1387 |
| Union tee / union cross | Tee · Cross | Tube OD to 2" (50 mm) | ASTM F1387 |
| Bulkhead union / port connector | Bulkhead union · Port connector | Tube OD to 2" (50 mm) | ASTM F1387 |
| Cap / plug | Cap · Plug | Per tube OD | Dimensional |
| Nut & ferrule set | Nut and ferrule | Per tube OD | Dimensional |
Every configuration swaps in and out on the same ASTM F1387 compression-tube-fitting basis. Take a look at Crestflo's full single-ferrule tube fitting range.
Parker CPI Sizes & Threads: Fractional 1/8"–2", Metric 3–50 mm, NPT, BSPP & Weld Ends
Crestflo lines up with the Parker CPI size and end-connection envelope in both measurement systems. Tube OD and thread dimensions come straight from the standard published values: ASME B1.20.1 governs NPT, while BSPP/BSPT and metric OD tables cover the rest. Figures track the applicable standard, but they're customizable when requirements call for it.
| Parameter | Crestflo availability |
|---|---|
| Imperial tube OD | 1/8, 3/16, 1/4, 3/8, 1/2, 5/8, 3/4, 7/8, 1, 1-1/4, 1-1/2, 2" |
| Metric tube OD | 3, 6, 8, 10, 12, 14, 15, 16, 18, 20, 22, 25, 28, 32, 38, 50 mm |
| Tapered pipe threads | NPT, NPTF, BSPT |
| Parallel / straight threads | BSPP, ISO-parallel, SAE-ORB |
| Flare / tube / weld ends | JIC 37°, tube-OD, socket-weld, butt-weld |
Ferrules come hardened or non-hardened, depending on what the job calls for. Crestflo offers both metric and imperial-fractional sizes across every fitting.
Parker CPI Fitting Alloys: 316/316L Stainless Through Hastelloy, Inconel, Monel & Duplex
Where Parker CPI stock typically runs 316 stainless, Crestflo interchange covers the whole corrosion-resistant-alloy range. That's a core differentiator for sour, cryogenic, offshore, and high-halide service.
| Alloy | UNS | Crestflo instrumentation forms | Material page |
|---|---|---|---|
| 316 / 316L | S31600 / S31603 | Fittings, valves, tubing | 316/316L |
| Duplex 2205 | S32205 | Fittings, valves, tubing | Duplex 2205 |
| Super Duplex 2507 | S32750 | Fittings, valves, tubing | Super Duplex 2507 |
| 254 SMO | S31254 | Fittings, valves, tubing | 254 SMO |
| 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 |
| Titanium Gr2 | R50400 | Fittings, valves | Titanium Gr2 |
Also on offer: 304/304L, 904L, AL-6XN, Alloy 20, Inconel 600/601/718/825, Incoloy 800/800H, Monel K500, Hastelloy C-22/B-2/B-3/X, and Nickel 200/201. The UNS designations follow standard published values. Availability covers instrumentation fittings, valves, and tubing only; Crestflo doesn't supply bar, sheet, plate, or mill products. Where specified, alloys are supplied NACE MR0175 / ISO 15156 compliant.
ASTM F1387: The Standards-Based Proof Behind a Parker CPI Interchange Claim
An interchange claim is only as good as its proof. Crestflo puts its single-ferrule tube fittings through ASTM F1387, the performance standard for compression tube fittings: hydraulic proof, burst and impulse pressure, pull-out, vibration, and thermal-cycling tests. That's not a line from a brochure. It's the objective qualification that backs the Parker CPI-to-Crestflo interchange.
| Test / credential | Basis |
|---|---|
| Compression-fitting performance | ASTM F1387 |
| Sour-service compliance | NACE MR0175 / ISO 15156 |
| Thread standard (NPT) | ASME B1.20.1 |
| 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 can be adjusted to fit your requirements. For details, see the ASTM F1387 standard page, NACE MR0175, ISO 15156, EN 10204 MTC, and traceability pages. Crestflo holds ISO 9001, 14001, and 45001 certification, along with PED certification.
Request Your Parker CPI Cross-Reference & Interchange Quote
Send us your Parker CPI part list or BOM. We'll put together a same-part interchange chart and turn around an RFQ. Reach the Crestflo engineering team at sales@crestflousa.com or +1 346 594 9005, based in Houston, TX.
- Request a quote, same-part Parker CPI equivalent RFQ
- Request a sample, validate the fit before you convert
- Cross-reference lookup tool, check equivalents online
- Parker CPI alternative, the switching case, feature by feature
Datasheets and CAD models are available to customers on request.
Why Crestflo for Parker CPI Interchange
Crestflo is the instrumentation division of an export house with four decades under its belt and formal recognition from the Government of India, now serving US buyers through a drop-in interchange program that's built on capability, not stock claims:
- ASTM F1387-qualified single-ferrule fittings, the objective interchange proof few competitors publish.
- Imperial and metric sizes on every fitting, matching the Parker CPI envelope in tube OD to 2" (50 mm).
- Exotic-alloy depth: 316/316L, Hastelloy, Inconel, Monel, Duplex, and Titanium. That's more than most distributors keep in stock.
- Heat-number traceability on every part with EN 10204 3.1 MTC (3.2 on request).
- Small MOQ and private label, plus a post-tariff cost advantage for US buyers.
- Ready stock on standard items, made-to-order for specials, 6-8 week delivery, details on lead time.
- Indian origin, with US or European melt available on request, backed by full material traceability, see US-origin compliance. Crestflo stands behind every batch.
We Engineer Confidence.
Frequently Asked Questions About Parker CPI Cross-Reference
Does Crestflo make an equivalent to Parker CPI fittings?
Yes. Crestflo's single-ferrule instrumentation tube fittings match Parker CPI™ fittings dimension for dimension, and they carry ASTM F1387 qualification. Before converting, check the specific part and the service conditions first. Don't mix components within a single connection.
What is a Parker CPI fitting?
Parker Hannifin's CPI fitting handles gas and liquid systems as a single-ferrule instrumentation compression tube fitting. It's built from three parts: a body, a nut, and one ferrule, which swages onto the tube's outer diameter to grip it and seal the joint. CPI is a trademark belonging to Parker Hannifin.
What is the difference between Parker CPI and A-LOK?
Parker CPI relies on a single ferrule. The A-LOK line from Parker takes a different approach: two ferrules, twin-ferrule or double-ferrule construction. These aren't interchangeable; they follow different interchange envelopes entirely. Need A-LOK equivalents? The Crestflo Parker A-LOK cross-reference has them. For CPI, this page is the one to use.
Are Parker CPI and Crestflo fittings interchangeable or drop-in?
These parts qualify as dimensional-interchange equivalents under ASTM F1387. That's why the Crestflo single-ferrule fitting fits onto the same tube envelope. Crestflo sticks with the terms "interchange" and "equivalent," not "compatible" or "genuine." Doing so confirms the exact part named on the RFQ.
How do I find the Crestflo equivalent to a Parker CPI part number?
Send your Parker CPI part numbers or BOM to the Crestflo engineering team. You'll get back the matching equivalent ordering codes, along with an RFQ. Each equivalent is published per part, so the cross-reference reflects your actual sizes, alloys, and end connections.
In which materials can I get the Parker CPI equivalent?
316 and 316L come as standard, but the range doesn't stop there. It extends through Duplex 2205, Super Duplex 2507, 254 SMO, AL-6XN, Alloy 20, Inconel, Incoloy, Monel, Hastelloy, and Nickel 200/201, up to Titanium Gr2. Where specified, everything ships compliant with NACE MR0175 and ISO 15156, across instrumentation fittings, valves, and tubing.
Do you offer metric and imperial Parker CPI sizes?
Crestflo offers both imperial (fractional) and metric sizes on every fitting, with tube OD running up to 2" (50 mm). Each size comes with matching NPT, NPTF, BSPP, BSPT, ISO-parallel, JIC 37°, SAE-ORB, tube-OD, and weld end connections.
What is the lead time and MOQ?
Ready stock covers the standard items. Specials are made to order, and those run 6-8 weeks for delivery. Small MOQs are available, and private-label options too. All ready stock is held in India.
Do you provide material certificates and traceability?
Each part gets a heat/lot number. EN 10204 3.1 MTCs come standard, and 3.2 is available on request. We also run PMI and in-house NDT, plus third-party inspection can be arranged if you need it.
Is Crestflo affiliated with Parker?
No. Parker Hannifin Corporation owns the CPI™ trademark. Crestflo builds interchangeable equivalents as an independent manufacturer, with no affiliation to Parker Hannifin, no authorization from the company, and no endorsement by it. Genuine Parker parts aren't something Crestflo sells.