Hoke vs Crestflo: Instrumentation Fitting & Valve Interchange Comparison
Hoke vs Crestflo pits two suppliers of instrumentation tube fittings and valves against each other. Hoke, Inc. is a long-established US manufacturer, and its Gyrolok line is a twin-ferrule compression tube fitting. Crestflo serves the US market too, and its twin-ferrule fittings are qualified for dimensional interchange under ASTM F1387 performance testing. Both companies build within the same mechanical design space. That means the real decision doesn't hinge on basic engineering. It comes down to interchange proof, alloy depth, certification and traceability documentation, lead time, and sourcing model.
One clarification matters here. "Hoke" refers to Hoke, Inc., the instrumentation fitting and valve maker known for Gyrolok tube fittings and its needle, ball, check and manifold valves. It's not the 1913 US Supreme Court case Hoke v. United States, which tends to dominate a literal search on the name. The scope under discussion is instrumentation compression tube fittings and instrumentation valves made from stainless and high-nickel/CRA alloys. It doesn't cover electrical wire ferrules or copper plumbing fittings.
Hoke and Gyrolok remain registered trademarks of their respective owner. Crestflo isn't affiliated with, sponsored by, or endorsed by Hoke, Inc. or CIRCOR. Every comparison here is strictly dimensional, meant only as a reference for interchange.
Also Known As: Hoke vs Crestflo, Crestflo vs Hoke, Gyrolok Interchange
Buyers land on this comparison through a dozen different search terms, but they're all asking the same sourcing question. It shows up as hoke vs crestflo, crestflo vs hoke, hoke versus crestflo, hoke or crestflo, and Hoke compared to Crestflo. The twin-ferrule line in question is Hoke's Gyrolok two-ferrule (double-ferrule) tube fitting. People search for it as gyrolok fittings, gyrolok tube fittings, hoke gyrolok, and gyrolok alternative or gyrolok equivalent. Related searches, Hoke fittings, hoke equivalent fittings, hoke replacement fittings, hoke drop-in replacement, hoke second source, hoke interchange, and gyrolok interchange, point to one goal: engineering a part that's dimensionally interchangeable. That's exactly what the sections below cover.
Who Is Hoke? Hoke Inc., Gyrolok & the CIRCOR Brand
Hoke, Inc. has been making instrumentation tube fittings and valves for process measurement, sampling, and control for a long time now, and it's been part of the CIRCOR International group for years. Its flagship line, Gyrolok, is a twin-ferrule (two-ferrule) compression fitting. Hoke also produces needle, ball, check, and manifold instrumentation valves. Note that this is the Hoke tied to fittings and valves, not the Supreme Court case sharing the name, and not a carburetor or plumbing valve either. Crestflo's double-ferrule compression fitting serves as the interchange equivalent to the Gyrolok pattern. It's built to the same gauging envelope, but it isn't made by Hoke or for Hoke.
Hoke vs Crestflo: Full Comparison Table
Values shown for Crestflo come straight from Crestflo product data and the applicable standards. Figures listed for Hoke reflect that manufacturer's own published positioning. Before specifying anything based on a Hoke number, check it against Hoke's current published data.
| Attribute | Hoke / Gyrolok | Crestflo |
|---|---|---|
| Brand / origin | Hoke, Inc., US manufacturer, part of the CIRCOR International group | Crestflo, US-serving manufacturer; Indian origin, US/European melt available on request |
| Core fitting design | Gyrolok twin-ferrule (double-ferrule) compression tube fitting | Twin-ferrule and single-ferrule compression tube fittings; hardened & non-hardened ferrules |
| Interchange basis (fittings) | Vendor dimensional standard | Dimensional interchange qualified under ASTM F1387 performance testing |
| Valve qualification basis | Manufacturer QA program | Instrumentation valves built to ASME B16.34 / API 6D / 598 / 602 as applicable |
| Size range (fittings) | Fractional and metric, per Gyrolok catalog | End connections up to 2" (50 mm) OD; imperial and metric on all fittings |
| Valve size range | Per Hoke series | 1/16"–1", metric or imperial, threaded or tube-fitting ends |
| Stainless grades | 316 typical | 304/304L, 316/316L, 904L |
| Exotic / CRA alloys | Select alloys per line; confirm with manufacturer | Duplex 2205, Super Duplex 2507, 254 SMO, AL-6XN, Alloy 20; Inconel 600/601/625/718/825, Incoloy 800/800H/825, Monel 400/K500, Hastelloy C-276/C-22/B-2/B-3/X, Nickel 200/201, Titanium Gr2 |
| Instrumentation valves | Needle, ball, check, manifold | Ball, needle, check/NRV, bellows/diaphragm (packless), relief, bleed, metering, manifold (2/3/5-way), DBB, gauge, toggle, plug |
| NACE / sour service | Available on select materials | NACE MR0175 / ISO 15156-compliant materials |
| Certifications | ISO 9001; product approvals per Hoke | ISO 9001 / 14001 / 45001 & PED certified; ASTM F1387 (fittings) |
| Traceability / MTC | Material certificates available | EN 10204 MTC 3.1 standard, 3.2 on request; heat/lot number on every part |
| Lead time | Via distributor stock / factory | Ready stock for standard items · made-to-order for specials · 6–8 week delivery |
| MOQ / private label | Distributor-driven | Small MOQ; private-label / OEM program available |
Tube Fittings: Gyrolok Interchange & Twin-Ferrule Equivalence
Crestflo uses the same twin-ferrule mechanical envelope as the Gyrolok line, which means its tube fittings interchange dimensionally with Hoke tube fittings and the Gyrolok twin-ferrule pattern. That holds true against Hoke Gyrolok compression fittings across the standard fractional and metric sizes, all the way up to 2" (50 mm) OD. Front-ferrule and back-ferrule geometry, nut thread, and gauging envelope all match the standard instrumentation double-ferrule pattern. Ferrules come hardened or non-hardened, depending on what the service calls for. If you're weighing the mechanics, the single vs double (twin) ferrule explainer walks through the design, and the full lineup lives under double-ferrule instrumentation tube fittings. Crestflo won't publish an unverified Hoke-to-Crestflo part number. Instead, request your Hoke cross-reference, and the engineering team will confirm the equivalent against your exact Hoke or Gyrolok part before you place an order. Worth a look too: the Gyrolok cross-reference and the switch-source case laid out on the Hoke alternative page.
Valves: Hoke vs Crestflo Needle, Ball, Check & Manifold
Hoke, Inc. builds instrumentation valves: needle, ball, check, and manifold types, all meant for process measurement and control. Crestflo works the same territory, offering an equivalent range of instrument valves. Neither company makes carburetor or plumbing valves; these are instrumentation valves, full stop. The Crestflo lineup runs from 1/16", 1" in metric or imperial, with threaded or tube-fitting ends. Fittings get qualified to ASTM F1387. Valves don't follow that path. They're built to whatever valve standard applies to each type.
| Valve type | Size range | Standard basis | Product |
|---|---|---|---|
| Needle valve | 1/16"–1" | API 602 as applicable | Needle valve |
| Ball valve | 1/16"–1" | API 6D as applicable | Ball valve |
| Check valve / NRV | 1/16"–1" | API 598 test as applicable | Instrumentation valves |
| Manifold (2/3/5-way) | To 10,000 psi | 100% seat & shell leak tested | Instrumentation valves |
| Double block & bleed | Per design | ASME B16.34 | ASME B16.34 |
Pressure and temperature ratings follow the applicable standard and valve series. They can be adjusted to suit your specific requirements.
Interchange Basis: The ASTM F1387 Proof Behind Drop-In Equivalence
Interchange between Hoke and Crestflo tube fittings comes down to dimensions. It isn't a claim of shared manufacture. What makes the drop-in provable is this: Crestflo twin-ferrule fittings are backed by ASTM F1387 interchange qualification, the performance-qualification standard for compression tube fittings, rather than resting on a dimensional assertion alone. Few of the major brands publish that kind of proof. The relationship is a dimensional interchange, equivalent geometry backed by performance testing. It's described as interchange and equivalent, never as compatible, intermix, or genuine Hoke. Crestflo won't put out an unchecked chart, so the confirmed equivalent for any Hoke or Gyrolok part comes back on request through the Hoke part-number cross-reference page. Multi-brand equivalents live on the master interchange overview.
Alloys Crestflo Adds Beyond Stainless: Duplex, Inconel, Hastelloy, Titanium
Hoke sticks to mainstream 316 stainless. Crestflo goes further, stocking stainless alongside a deep range of corrosion-resistant alloys built for sour, chloride, and high-temperature service. Every alloy ships in instrumentation forms: twin-ferrule tube fittings, valves, and tubing, each carrying heat-number traceability. None of it comes as bar, sheet, or mill product.
| Alloy family | Grades (UNS) | Instrumentation forms |
|---|---|---|
| Austenitic stainless | 304/304L, 316/316L (S30400/S31600), 904L (N08904) | Fittings, valves, tubing |
| Duplex / super-duplex | 2205 (S32205), 2507 (S32750) | Fittings, valves, tubing |
| Super-austenitic | 254 SMO (S31254), AL-6XN (N08367), Alloy 20 (N08020) | Fittings, valves, tubing |
| Nickel | Inconel 625/825, Monel 400/K500, Hastelloy C-276/C-22 | Fittings, valves, tubing |
| Titanium | Grade 2 (R50400) | Fittings, valves, tubing |
Compositions follow the applicable ASTM/UNS specifications. Need something specific? We'll tailor it to the requirement. For sour service, grades meeting NACE MR0175 and ISO 15156 are on offer.
Lead Time & Total Cost After US Duties
Crestflo keeps standard items in ready stock and builds specials to order in 6-8 weeks, well ahead of the 20-plus-week lead times typical of engineered instrumentation from the major suppliers. Delivered cost stays competitive even after US duties. Small-MOQ and private-label programs also strip away the distributor-stock minimums that buyers so often run into with brand-name lines. The underlying data sits in the 6-8 week lead time capability and the post-tariff cost benchmark. Origin isn't hidden: product is Indian origin, US or European melt is available on request, and full material traceability comes standard. TAA/DFARS options are laid out on US-origin compliance.
Certifications, Traceability & Testing
Crestflo holds ISO 9001 / 14001 / 45001 and PED certification. Its compression fittings are qualified to ASTM F1387, and materials for sour service meet NACE MR0175 / ISO 15156. Each part carries a heat/lot number, with EN 10204 MTC 3.1 supplied as standard and 3.2 available on request. In-house NDT, PMI, and destructive testing back this up, all performed at ISO/IEC 17025-accredited labs. Third-party inspection can be arranged on request. Certificates stay on file. See material traceability. Datasheets and CAD drawings go to customers on request, not as public downloads.
Why Buyers Second-Source or Switch to Crestflo
Crestflo is the instrumentation division of an export house four decades old, recognized by the Government of India, with a proven delivery record across the Middle East. That heritage backs the quality system behind a newer manufacturing brand. Against Hoke, the differences are specific and easy to state. ASTM F1387-qualified dimensional interchange for Gyrolok-pattern fittings. A far broader range of exotic alloys. Delivery in 6-8 weeks. Small MOQ, available under private label. Heat-number traceability, with MTC 3.1/3.2 issued on every part. Whether a buyer wants a full switch or just a qualified second source, Crestflo answers from the buyer's side, and it doesn't disparage the incumbent to make the case. We Engineer Confidence.
Request a Quote, Sample or Cross-Reference
Testing Crestflo against a Hoke or Gyrolok specification doesn't take much: request a quote for Hoke-equivalent fittings, request a sample, or look into the distributor and OEM program and private-label program. The US team is at sales@crestflousa.com or +1 346 594 9005. Houston, TX, to be exact. For related lines, check the Swagelok vs Crestflo, Hy-Lok vs Crestflo, and Fitok vs Crestflo pages, or head back to the cross-reference hub.
Frequently Asked Questions: Hoke vs Crestflo
Are Crestflo fittings interchangeable with Hoke and Gyrolok?
Crestflo builds dimensional drop-in equivalents to Hoke and Gyrolok twin-ferrule tube fittings. That interchange rests on ASTM F1387 performance qualification, not a dimensional claim alone. Crestflo calls this relationship interchange and equivalent, nothing more; it's never compatible or intermix. Since Crestflo won't publish an equivalent it hasn't verified, ask for your Hoke cross-reference first. From there, the engineering team confirms the fit against your exact part before you order.
What is a Hoke valve?
Hoke, Inc. builds instrumentation valves, needle, ball, check, and manifold types, for isolating, metering, and controlling fluids in process measurement and sampling systems. These are instrumentation valves, not carburetor or plumbing valves. Crestflo makes equivalent instrument valve families spanning 1/16" to 1", built to the applicable standards, including ASME B16.34 and API 6D/598/602.
Who owns Hoke?
Hoke, Inc. is a long-established American manufacturer of instrumentation fittings and valves. For many years now, it's been part of the CIRCOR International group. Crestflo, by contrast, operates independently. It isn't affiliated with, sponsored by, or endorsed by Hoke, Inc. or CIRCOR.
What is Gyrolok?
Hoke built Gyrolok as its twin-ferrule (two-ferrule) compression tube fitting line. Crestflo's double-ferrule fitting is the dimensional interchange equivalent. It's engineered to the same front-ferrule, back-ferrule, and gauging envelope, and qualified under ASTM F1387.
Does Crestflo prove its interchange?
Yes. Crestflo backs up its twin-ferrule interchange claim with ASTM F1387, the performance-qualification standard for compression tube fittings. Most competitors don't publish this kind of data. That's the difference: the interchange stands as a documented drop-in equivalent, not just a dimensional assertion.
What alloys does Crestflo offer beyond typical stainless?
Crestflo doesn't stop at 304, 316, and 904L stainless. The lineup also runs to Duplex 2205, Super Duplex 2507, 254 SMO, AL-6XN, and Alloy 20, alloys built for tougher chloride environments. On the nickel side, there's Inconel 600/601/625/718/825, Incoloy 800/800H/825, Monel 400/K500, Hastelloy C-276/C-22/B-2/B-3/X, and Nickel 200/201. Real depth, in other words. Titanium Grade 2 in instrumentation fittings and valves rounds out the range, and together these give customers serious corrosion-resistant-alloy coverage for sour and chloride service.
Is Crestflo affiliated with Hoke?
No. Hoke and Gyrolok are registered trademarks belonging to their owner. Crestflo operates as an independent manufacturer, and it isn't affiliated with, authorized by, or endorsed by Hoke, Inc. or CIRCOR. Any mention of Hoke here serves one purpose: comparing dimensions for interchange.
How fast can Crestflo deliver compared with Hoke?
Crestflo ships standard items straight from stock, and specials get made to order in 6-8 weeks. Compare that to the 20-plus-week lead times you'd typically face for engineered instrumentation from the major players.
Can I get MTC and heat-number traceability?
Yes. EN 10204 MTC 3.1 comes standard, and 3.2 is available on request. Every part gets a heat/lot number, and destructive testing runs at labs accredited to ISO/IEC 17025.
Are Crestflo fittings made in the USA?
Crestflo serves the US market as a manufacturer with Indian origins. Need US or European melt? It's available on request, and every batch comes with full material traceability. Origin details and TAA/DFARS options aren't buried or dressed up: they're spelled out plainly on the US-origin compliance page.
Can Crestflo private-label or match small volumes?
Yes, small-MOQ and private-label/OEM programs are both available. Start with a quote or a sample request, and the engineering team will scope the program to match your volumes.
Related Cross-References & Resources
- Hoke cross-reference, request your part equivalent
- Hoke alternative, switch-source guide
- Gyrolok cross-reference, twin-ferrule equivalents
- Single vs double ferrule, design explainer
- Cross-reference hub, all interchange pages
The Crestflo Engineering Team reviewed this piece. Hoke and Gyrolok are registered trademarks belonging to their owner. Crestflo isn't affiliated with, sponsored by, or endorsed by Hoke, Inc. or CIRCOR.