SSP® Tube Fitting Cross-Reference: Crestflo Interchange & Equivalents

A cross-reference for SSP tube fittings pairs an SSP® instrumentation compression tube fitting with a dimensionally equivalent part from another manufacturer. Hold an SSP part number or a bill of materials, and you can source a true form-fit-function interchange. Crestflo builds instrumentation compression tube fittings as dimensional equivalents to SSP® Duolok® (double-ferrule) and Griplok® (double-ferrule) tube fittings, qualified for interchange under ASTM F1387. Same alloy as your original, if you want it. Or step up to an upgraded corrosion-resistant grade.

On this page, "fitting" means something specific: an instrumentation compression tube fitting sealed by a metal ferrule, built for stainless or high-alloy fluid systems. It's not an electrical wire ferrule, and it's not a brass or copper plumbing compression fitting. SSP®, Duolok®, and Griplok® are trademarks of SSP Fittings Corp. Crestflo isn't affiliated with, sponsored by, or endorsed by SSP Fittings Corp. These marks appear here only to identify the fittings Crestflo offers an interchange for. Send your SSP part list and receive a matched same-alloy or upgraded-alloy quote. Request your SSP cross-reference.

SSP Fittings Also Known As: Duolok, Griplok & Twin-Ferrule Interchange

People land on this interchange through a handful of different names. SSP Fittings Corp. makes the product, and it shows up in searches as SSP Fittings, SSP Fittings Corp., SSP Corporation, SSP instrumentation fittings, and via the myssp portal. The company's two instrumentation tube-fitting lines each carry their own trade name. Duolok® is SSP's Swagelok®-interchange twin- (double-) ferrule fitting; Griplok® is SSP's Hoke® Gyrolok®-interchange twin-ferrule fitting. (SSP's single-ferrule line is Unilok®.) Whether someone asks for an "SSP equivalent," an "SSP alternative," an "SSP replacement," an "SSP conversion," a "Duolok cross-reference," or a "Griplok cross-reference," they're after the same thing: a dimensional interchange for an SSP compression tube fitting.

SSP to Crestflo Interchange: Duolok, Griplok & Ferrule-Type Parity

Crestflo lines up SSP product lines against equivalent Crestflo instrumentation lines, matching at the ferrule-configuration and geometry level. Rather than publishing generic cross-references, Crestflo prepares part-number-for-part-number comparisons against your specific list. That means the mapping gets verified to your exact size, connection, and alloy. And the line-level mapping itself comes as an HTML cross-reference you read right on screen. No downloading an SSP catalog PDF, no paging through it hunting for the equivalent part.

Every Crestflo compression tube fitting ships in both imperial and metric sizes, covering the common range from 1/4″ and 1/2″ up through 6 mm and 12 mm, all the way to 2″ (50 mm) tube OD. Hardened and non-hardened ferrules are available to requirement. You'll find the full product detail on the Crestflo compression tube fittings page. Need the verified line-item mapping for your SSP numbers? Request your SSP cross-reference from the Crestflo engineering team.

What the SSP Interchange Is Based On: Dimensional Equivalence & ASTM F1387

Two things make an interchange real, not just a claim. First, dimensional equivalence: form, fit, and function matching the SSP fitting envelope. Second, performance qualification to ASTM F1387, the recognized specification governing mechanically attached (compression) tube fittings. F1387 gives the claim a testable foundation. Without it, a fitting is just a look-alike, not a genuine interchange.

Two cautions keep this interchange honest. First, work at the fitting or assembly level: replace the whole SSP fitting with the whole Crestflo equivalent, not a mix of individual ferrule components from different manufacturers in one connection. Second, keep in mind that SSP itself markets Duolok as a Swagelok-interchange line. If your original reference brand is Swagelok, the Swagelok cross-reference is the better place to start. SSP also markets an interchange-and-intermix capability across its own reference material. Crestflo makes no such claim. It describes its parts only as a dimensional interchange, never as an intermix. Crestflo calls these fittings an interchange, an equivalent, a dimensional replacement, or a form-fit-function drop-in replacement for the SSP fitting. That's the honest engineering language for a manufacturer-independent match.

Interchange Basis & Verification at a Glance

Same SSP Fitting Geometry in Inconel, Hastelloy, Monel & Duplex

Crestflo supplies the SSP-equivalent geometry in standard 316/316L and 304/304L stainless grades, and also in corrosion-resistant and high-nickel alloys that general catalogs rarely stock for instrumentation fittings. Available families include duplex 2205 and super duplex 2507, 254 SMO, AL-6XN, Alloy 20, and 904L. There's also the Inconel 600/601/625/718/825 and Incoloy 800/800H/825 group, Monel 400 and K500, the Hastelloy C-276/C-22/B-2/B-3/X group, Nickel 200/201, and Titanium Grade 2. Sour-service jobs are covered too, with NACE MR0175 / ISO 15156 compliant material available. Browse grades on the instrumentation fitting materials hub, including 316/316L, Inconel 625, and Hastelloy C-276. That means you can re-source an entire SSP line and upgrade the alloy in one move.

Who Is SSP? SSP Fittings Corp., Duolok & Griplok

Crestflo has no affiliation with SSP Fittings Corp., a US manufacturer of instrumentation tube fittings, valves, and related fluid-system components. SSP markets its compression tube fittings under the Duolok® (double-ferrule) and Griplok® (double-ferrule) trade names, and it publishes its own product catalog (catalog), interchange material, and cross-reference guides, including the EB Cross Reference Guide. This description exists solely to identify those products accurately. SSP®, Duolok®, and Griplok® remain trademarks of SSP Fittings Corp. Crestflo operates as an independent manufacturer, nothing more.

Why Crestflo for Your SSP Interchange

Crestflo is the instrumentation division of an export house that's been in business for four decades, recognized by the Government of India, with a delivery track record across the Middle East. That heritage gives the brand its engineering credibility. For SSP interchange buyers, here's what it delivers: dimensional equivalents qualified to ASTM F1387; imperial and metric sizing on every fitting; single and double ferrules, hardened or non-hardened; heat and lot traceability backed by EN 10204 3.1 or 3.2 MTC; manufacturing certified to ISO 9001, 14001, 45001 and PED; small minimum order quantities; private-label capability; and a corrosion-resistant alloy range that goes well beyond the standard stainless catalog. Availability runs on a simple model: ready stock for standard items, made-to-order for specials, and 6-8 week delivery. Indian origin material is standard, but US or European melt is available on request, with full material traceability.

SSP fittings distributors, including buyers who already source SSP through its distributor portal and want a second-source line, can request a line card and distributor program details. OEMs can look into the private-label program. Plants and MRO buyers have two options: request a quote or request a sample. Origin and TAA questions get straight, honest answers on the US origin & compliance page, and the 6-8 week lead time is spelled out on the lead-time page. For US inquiries, reach Crestflo at sales@crestflousa.com, +1 346 594 9005, in Houston, TX.

Out-of-Scope SSP Lines: Flare Fittings, Valves & Pipe Fittings

This cross-reference covers SSP instrumentation compression tube fittings. For SSP flare-fitting interest, see the broader Crestflo tube fittings and product range. For SSP valves (instrumentation-valve interest), see the Crestflo instrumentation valves range. SSP pipe fittings fall outside this US instrumentation-only site's scope. For an all-brand view, use the master interchange chart or the tube fitting cross-reference hub.

SSP Cross-Reference FAQ

Related Cross-References & Resources

• Tube fitting cross-reference hub
• Master interchange chart
• Swagelok cross-reference
• ASTM F1387 interchange qualification
• Crestflo compression tube fittings
• Instrumentation fitting materials

Reviewed by the Crestflo Engineering Team