Superlok® Tube Fitting Cross-Reference to Crestflo Equivalents

A Superlok cross-reference does one job: it ties a Superlok® twin-ferrule instrumentation part, whether that's a tube fitting, a ferrule set, or an instrumentation valve, to the dimensionally interchangeable Crestflo equivalent you can specify and buy in its place. Crestflo builds its own twin-ferrule instrumentation fittings and valves to interchange with that Superlok® envelope. Tube-fitting interchange is qualified to ASTM F1387, and valves are built to the applicable ASME B16.34 / API basis. Materials range from 316L through exotic alloys.

This cross-reference deals strictly with instrumentation twin-ferrule (double-ferrule) tube fittings and instrumentation valves. It doesn't cover hydraulic/JIC couplings, plumbing compression fittings, or electrical wire ferrules.

Crestflo operates independently and manufactures interchangeable equivalents. It carries no affiliation with BMT Co., Ltd. Superlok® is a registered trademark of that company, and nothing here suggests endorsement, licensing, or sponsorship by BMT Co., Ltd. or Superlok. Genuine Superlok parts aren't something Crestflo sells.

Request your Superlok cross-reference: Send us your Superlok part list or BOM, and Crestflo's engineering team will get back to you with the matching equivalents and an RFQ. Request a quote.

Superlok Interchange Is Also Called a Cross Reference, Conversion Chart or Equivalent

Buyers reach this same mapping through dozens of different terms, all pointing to one relationship: a Superlok part and its Crestflo counterpart. Some call it a Superlok cross reference. Others say cross-reference chart, interchange, interchange chart, conversion chart, equivalent, equivalent fittings, or replacement. You'll also see it written in the all-caps trade style "SUPERLOK," or flipped around as "cross reference for Superlok." The brand name itself shows up several ways too: Superlok, Superlok BMT (named for its manufacturer, BMT Co., Ltd. of South Korea), and through Superlok USA and Superlok North America distribution channels. Whether someone searches "superlok part number cross reference," "superlok cross reference chart," or "superlok cross reference pdf," they're after the same thing: a drop-in Crestflo equivalent for a given Superlok item.

What Is Superlok? Twin-Ferrule Tube Fittings by BMT Co., Ltd.

Superlok® is a twin-ferrule (double-ferrule) instrumentation compression tube-fitting line, made by BMT Co., Ltd. of South Korea and sold in North America as Superlok USA / Superlok North America. Like other twin-ferrule systems, a Superlok fitting grips and seals a tube through a back ferrule and a front ferrule, both drawn onto the tube's outside diameter as the nut is tightened. Superlok is a compression tube fitting built for fluid and gas systems, so "ferrule" here refers to the fluid-system sealing ferrule, not an electrical wire ferrule. And "compression fitting" means the instrumentation SS/alloy type, not the copper-plumbing kind. Crestflo builds its equivalents to that same dimensional envelope. A Crestflo body, nut, and ferrule set will make up onto your existing tube just the way the original does.

How the Superlok to Crestflo Interchange Works: Twin-Ferrule Geometry & Thread Parity

Twin-ferrule instrumentation fittings seal by way of a fixed geometric envelope: tube outside diameter, front- and back-ferrule profile, nut thread, and body bore. Match those dimensions and two fittings interchange, gripping and sealing on the same tube. Crestflo builds its twin-ferrule fittings to the Superlok dimensional envelope and checks performance against ASTM F1387. The result: the equivalent makes up on your tube exactly as the original does.

The match is dimensional, not a shared catalog. That's why the correct language is interchange and equivalent, not "compatible" or "intermix." Crestflo doesn't recommend mixing ferrules or other components across brands within a single made-up connection. Interchange covers both imperial (fractional) and metric tube sizes on all fittings, in tube OD up to 2" (50 mm), with matching end connections: 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 the requirement. Superlok's own literature references Swagelok, and a buyer standardizing across brands can cross straight to Crestflo; see the Swagelok cross-reference. Before converting, always check the specific part against your actual service conditions.

Request Your Superlok Part-Number Cross-Reference Chart

Crestflo doesn't work off a fixed public part-number table. Instead, it publishes validated equivalents part by part, so the mapping you get back reflects your actual Superlok designations, sizes, alloys, and end connections. Reading a Superlok catalog or BOM line is simple: break it down as size, connection, material, and family, then send that to the engineering team. A Superlok catalog code needs no proprietary decoding on your end. Send the Superlok part numbers, or the whole BOM, and you'll get back a same-part interchange chart along with an RFQ. Need to cross-reference several brands at once, say Swagelok, Parker, Hoke, Fitok, and DK-Lok? Use the master multi-brand interchange chart, or try the cross-reference lookup tool.

Superlok Product Families Cross-Referenced: Tube Fittings, Ferrules & Instrumentation Valves

Crestflo covers every Superlok instrumentation family with a direct equivalent within the instrumentation scope.

Tube fittings and ferrules interchange on the ASTM F1387 compression-tube-fitting basis. Instrumentation valves don't work that way: they qualify against the valve standards suited to their type, ASME B16.34 and the relevant API test standards, not F1387. Individual Superlok nut and ferrule items, spare ferrules included for re-makes and field service, cross to Crestflo spare ferrules and nuts on that same dimensional basis.

Superlok Thread & Connection Parity: NPT, BSPP, ISO-Parallel, JIC & Metric

Interchange holds up across end and thread configurations alike, in both imperial and metric. A Superlok line item converts on its exact connection, not a rough equivalent.

Thread designations follow standard published forms. End-connection availability, though, applies to instrumentation forms, and it's customizable to whatever the requirement calls for.

Superlok Fitting Alloys: 316L Stainless Through Hastelloy, Inconel, Monel & Duplex

Superlok stainless steel fittings usually come in 316 stainless steel. Crestflo interchange, by contrast, covers the full corrosion-resistant-alloy range. That's a core differentiator for sour, cryogenic, offshore, and high-halide service.

Additional grades on offer include 304/304L, Duplex 2205, Alloy 20, Inconel 600/601/718/825, Incoloy 800/800H/825, Monel K500, Hastelloy C-22/B-2/B-3/X, Nickel 200/201, and Titanium Gr2. UNS designations follow standard published values. Availability, however, is limited to instrumentation fittings, valves, and tubing forms. Crestflo doesn't stock bar, sheet, plate, or mill products. For sour service, compression fittings are supplied NACE MR0175 / ISO 15156 compliant when specified.

ASTM F1387: The Standards-Based Proof Behind a Superlok Interchange Claim

Crestflo doesn't just claim interchange works, it proves it. Twin-ferrule tube fittings get qualified to ASTM F1387, the performance standard for compression tube fittings. That means hydraulic proof testing, burst testing, impulse pressure testing, pull-out testing, vibration testing, and thermal cycling. The fitting has to survive all of it.

That's what backs a Superlok-to-Crestflo interchange for these fitting families: objective, dimensional, standards-based qualification under F1387, not a line from a marketing brochure.

Values follow the applicable standard and can be tailored to what you need. For specifics, see the ASTM F1387 standard page, NACE MR0175, EN 10204 MTC, traceability, and testing & inspection. Crestflo is certified to ISO 9001, 14001, and 45001, and it also carries PED certification.

Is Superlok Interchangeable With Swagelok or Crestflo?

Superlok, Swagelok, and Crestflo all build twin-ferrule instrumentation systems to comparable dimensional envelopes. That's why 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 Superlok envelope for fittings, and to ASME B16.34 / API for valves. Before converting, always confirm interchange on the specific part and service, and never mix components within a single made-up connection. Crestflo also publishes a Swagelok cross-reference and a master interchange chart for multi-brand conversions.

Request Your Superlok Cross-Reference & Interchange Quote

Send us your Superlok part list or BOM, and we'll return 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, based in Houston, TX.

• Request a quote, same-part Superlok interchange RFQ
• Request a sample, validate the fit before you convert
• Cross-reference lookup tool, check equivalents online
• Superlok alternative, the switching case, feature by feature
• Become a distributor, request the line card

Datasheets and CAD models are available to customers on request.

Why Crestflo for a Superlok 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's 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's backed by 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 Superlok envelope in tube OD to 2" (50 mm).
• Single and twin (double) ferrule builds, with hardened or non-hardened ferrules to requirement.
• Exotic-alloy depth: 316L, Hastelloy, Inconel, Monel, Duplex, and Titanium, well beyond what a typical distributor keeps 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 buyers in the US.
• Ready stock for standard items, made-to-order for specials, 6–8 week delivery. Details are on the lead time page.
• Indian origin, with US or European melt available on request. Traceability is complete end to end, and origin and TAA questions are handled plainly on the US-origin compliance page.

We Engineer Confidence.

Frequently Asked Questions About Superlok Cross-Reference

Related Cross-References & Resources

• Cross-reference hub
• Superlok alternative
• Swagelok cross-reference
• Master multi-brand interchange
• Twin-ferrule tube fittings
• ASTM F1387 standard
• Cross-reference lookup tool