Ihara® Instrumentation Tube-Fitting Cross-Reference: Crestflo Interchange Equivalents in Stainless AND Exotic Alloys

Reviewed by the Crestflo Engineering Team

> Trademark & independence notice: "Ihara®" is a trademark of Ihara Science Corporation. "Bi-Lok®" is a trademark of Ihara Science Corporation. Crestflo is not affiliated with, authorized by, sponsored by, or endorsed by Ihara Science Corporation. Every reference on this page is nominative, used only to identify the parts you already run so you can find the dimensionally equivalent Crestflo part. All claims are factual and dimensional. Crestflo supplies independently manufactured equivalents, not genuine Ihara products.

Crestflo manufactures dimensional equivalents to Ihara® double-ferrule instrumentation tube fittings, instrumentation compression fittings whose interchange is qualified to ASTM F1387, in 316L stainless and exotic alloys including Hastelloy, Super Duplex, Inconel, and Monel, with 6–8 week delivery. This cross-reference maps 96 Ihara instrumentation tube-fitting part numbers to their Crestflo equivalents. Send us the Ihara part numbers you buy today and we return the interchange equivalent, the alloys it ships in, and a quote.

Request your Ihara cross-reference & quote → · Send a part list, a print, or a sample, the Crestflo Engineering Team identifies the equivalent for you.

Scope: this cross-reference is for instrumentation double-ferrule tube fittings in stainless steel and alloy, not hydraulic/JIC, plumbing compression, or electrical ferrules. Here "ferrule" means a fluid-system compression ferrule and "connector," "union," "tee," and "elbow" mean instrumentation tube-fitting shapes.

What Ihara tube fittings are

Ihara® tube fittings are twin-ferrule (double-ferrule) instrumentation compression fittings that seal small-bore stainless and alloy tubing in analytical, process, semiconductor, and high-purity gas lines. A complete twin-ferrule fitting is a body, a nut, a front ferrule, and a back ferrule; pulling the nut up advances the two ferrules onto the tube OD to make a gas-tight, mechanically gripped joint. Ihara Science Corporation is a Japanese manufacturer, formerly Ihara High Pressure Fittings Co., Ltd., long established in ultra-high-purity (UHP) and semiconductor service, and its double-ferrule line is marketed under the Bi-Lok® name. Its DCT series covers double-ferrule tube-fitting connectors, with an MDCT metric variant. Crestflo builds to the same twin-ferrule geometry and the same imperial and metric size conventions, which is what makes a location-for-location swap possible: an Ihara DCT… connector cross-references to a Crestflo C… part, for example an Ihara DCT1-1 interchanges with a Crestflo CMC 1-1N.

Because Ihara is strong in semiconductor and analytical UHP service, buyers often run its double-ferrule fittings alongside face-seal and microweld fittings on the same tool or panel. Crestflo covers the double-ferrule interchange here and also builds instrumentation face-seal fittings and high-purity forms where the application calls for a metal-gasket seal.

Ihara designations this cross-reference also covers

Ihara buyers write the brand, the series, and the interchange in many forms, and every one of them points to the same Crestflo interchange.

Ihara interchange attributes: how the equivalent is defined

A cross-reference answers one question: for the Ihara part I buy today, what is the Crestflo part that dimensionally interchanges, and in which alloys? The 96-part interchange between Ihara double-ferrule tube fittings and Crestflo parts is published as a lookup table on this page and in the cross-reference lookup tool. Because part-number mapping must be verified against your exact series, size, and material rather than guessed, Crestflo also confirms your cross-reference to order, that keeps every equivalent accurate to your bill of materials.

Ihara-to-Crestflo interchange attribute set

Values per applicable standard; customizable to requirement. Per-part alloy and size confirmation is provided with your quote.

Ihara part number cross reference: how to request it

The interchange table on this page maps 96 Ihara DCT/MDCT part numbers to Crestflo equivalents. For a part not on the list, send us the Ihara part numbers, a line-card export, a drawing, or a physical sample. The Crestflo Engineering Team returns the interchange equivalent, the ferrule and connection parity notes, the available alloys, and a quote, no login, no gated tool.

Request your Ihara® cross-reference →

Ihara cross reference chart / PDF: what you get instead

Where competitors bury interchange data in gated tools or un-searchable PDFs, Crestflo publishes the interchange as a clean, searchable table on this page and returns a verified document tied to your actual part list. Ask for it through the request-a-quote form or by emailing sales@crestflousa.com. You can also open the cross-reference lookup tool to start a request.

Ihara product families cross-referenced: connectors, ferrules & fittings

Crestflo equals the Ihara double-ferrule tube-fitting catalog shape for shape, each with its own product line to link to.

The full instrumentation tube-fitting range, imperial and metric, tube OD up to 2" (50 mm), sits under tube fittings, with high-purity metal-gasket forms under face-seal fittings.

Ihara equivalents in stainless AND exotic alloys: the Crestflo wedge

This is where Crestflo separates from stainless-only cross-references: the same dimensionally equivalent fitting is available not just in 316 SS but across exotic and corrosion-resistant alloys that a standard high-purity stock range does not lead with. Availability is by fitting type and alloy; per-part confirmation comes with your quote.

Alloy-availability matrix, Crestflo Ihara-equivalent fittings

✓ = available / made-to-order in that alloy. Ready stock for standard items · made-to-order for specials · 6–8 week delivery.

Ihara fitting in Hastelloy C-276

For wet-chlorine, sulfuric, and mixed-acid service, Crestflo equals the Ihara part in Hastelloy C-276 / C-22. See Hastelloy C-276 tube fittings and the Hastelloy C-276 material page.

Ihara fitting in Super Duplex 2507 & Duplex 2205

For high-chloride and offshore seawater duty, the equivalent is available in Super Duplex 2507 and Duplex 2205. See Super Duplex 2507 tube fittings and the Duplex 2205 material page.

Ihara fitting in Inconel 625 / Inconel 825 & Monel 400

For high-temperature, sour-gas, and hydrofluoric service, Crestflo equals it in Inconel 625, Inconel 825, and Monel 400. See Inconel 625 tube fittings, Inconel 825 tube fittings, and Monel 400 tube fittings.

Ihara fitting in 254 SMO, Alloy 20 & 904L

For sulfuric-acid and high-chloride process lines, Crestflo also supplies the equivalent in 254 SMO, Alloy 20, and 904L, see the 254 SMO, Alloy 20, and 904L material pages. Default material is 316/316L, see the 316/316L material page.

Is Ihara interchangeable? Interchange vs. intermix

This is the question every specifying engineer should ask, and the honest answer earns trust:

• Interchange (correct): replace a complete Ihara fitting with a complete Crestflo fitting at the same location. Body, nut, and both ferrules are Crestflo. This is what "Ihara equivalent" and "drop-in replacement" mean here.
• Intermix (do not do this): mixing a Crestflo ferrule or nut with an Ihara body, or vice versa, inside a single joint. Twin-ferrule geometry and hardness are engineered as a set; mixing components across brands within one joint can compromise the seal and is not what "interchange" means.

Ihara and Swagelok are both twin-ferrule instrumentation systems built to comparable dimensional envelopes, which is why buyers ask whether they interchange. The precise, safe answer is the same for every brand: use complete fittings of one brand as interchange equivalents; validate the specific part; and do not intermix components across brands within a joint. Crestflo publishes F1387-qualified equivalents across the category, see the Swagelok cross-reference and the master interchange chart. For the geometry itself, see single vs double ferrule. For a feature-by-feature comparison, see Ihara vs Crestflo; for the switching case, Ihara alternative.

Why the interchange is proven: ASTM F1387 for fittings

The interchange claim is not a marketing assertion, it rests on a published standard. Crestflo compression tube fittings are qualified to ASTM F1387, the performance qualification for mechanically attached (compression tube) fittings, covering the dimensional and performance behavior that is the basis for equivalence. That documented rigor is exactly what separates a qualified equivalent from an uncontrolled marketplace "equivalent" with no proof or traceability. Where a high-purity or face-seal fitting is specified, Crestflo manufactures to the applicable metal-gasket/face-seal standard and to a customer-specified surface-finish (Ra) target, state your UHP cleanliness and finish requirement on the RFQ.

Interchange-proof summary

Read more on the ASTM F1387 interchange qualification, the NACE MR0175 standard page, the EN 10204 MTC page, traceability, and testing & inspection.

How to request your Ihara cross-reference

1. Send your Ihara part numbers, a line-card export, a drawing, or a sample.
2. Tell us the alloy and size you need (or ask us to match what you run today).
3. We return the Crestflo equivalent, alloy availability, and quote, typically for delivery in 6–8 weeks.

Buyer paths: distributors → line-card / stocking program · equipment manufacturers → send a print for made-to-print interchange · OEMs → private-label program · end users, MRO & EPC → RFQ or sample. All routes start at the RFQ form.

RFQ form fields: Name · Company name · Email · Phone · Requirement description.

Request your Ihara® cross-reference & quote → · Request a sample · Or contact Crestflo: sales@crestflousa.com · +1 346 594 9005 · Houston, TX.

Why buyers switch to Crestflo

Crestflo is the alloy-aware, standards-backed alternative to Ihara, and the reasons buyers move are specific:

• Drop-in interchange, dimensionally equal and qualified to ASTM F1387, not a marketplace guess.
• Stainless AND exotic alloys, Hastelloy, Super Duplex, Inconel, Monel, 254 SMO, Alloy 20, a range a high-purity stock catalog does not lead with.
• 6–8 week delivery on made-to-order specials, versus the long lead times common on imported Japanese product.
• Cost-competitive even after US duties/tariffs, see the tariff cost advantage.
• Small MOQ and private-label / OEM programs, with a stated lead time.
• Heat/lot number on every part with EN 10204 3.1 MTC as standard.
• ISO 9001 / 14001 / 45001 & PED certified.

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, see US-origin compliance. We Engineer Confidence.

Explore the underlying product line: Crestflo tube fittings, nut & ferrule sets, and face-seal fittings. Browse all interchange guides at the cross-reference hub.

FAQ

Other brand tube-fitting cross-references

Not an Ihara user? Crestflo publishes interchange guides across the instrumentation category:

• Swagelok cross-reference
• Parker A-Lok cross-reference
• Hy-Lok cross-reference
• Fitok cross-reference
• DK-LOK cross-reference
• Hoke cross-reference · Gyrolok cross-reference
• All brand interchange guides · Master interchange chart

Related: Ihara alternative · Ihara vs Crestflo.

Ihara® and Bi-Lok® are trademarks of Ihara Science Corporation. Crestflo is not affiliated with, authorized by, or endorsed by Ihara Science Corporation. All references are nominative and used only to identify equivalent parts. Crestflo supplies independently manufactured dimensional equivalents. Origin: Indian origin; US / European melt available on request, with full material traceability.