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Pushing fluid through standard tubing at 20,000 PSI creates a problem you can't ignore — the connection point becomes the weakest link in the chain, and a conventional compression or ferrule-style fitting will simply blow apart under that load. We've seen it happen in test rigs when people try to get away with pipe thread or standerd Swagelok-type connections, the result is a pressurized projectile or a sudden line burst that evacuates hydraulic fluid in milliseconds. What you actually need is a mechanical lock that can hold against that much wall stress without relying on friction alone.
The coned-and-threaded design on these 20UE Series fittings handles it by creating a metal-to-metal seal at a precisely machined cone face, with the nut drawing the tube shoulder into the body under significant preload torque. It is basically a miniature version of what you'd see on high-pressure autoclave head or a cone-and-thread joint on a 10,000 PSI gas cylinder — hexagon head is generous enough to get a full turn with a standard wrench, and we specify tightening values you'll find on the COA. 316 stainless gives you good general corrosion resistance for most media, though if you're running sour gas or chlorides, the Alloy 826 variants kick in.
Pressure rating is 20,000 PSI at ambient with the ISO 15500 qualification, derated to about 13,000 PSI at 200°C give or take because the material creep curves start to matter above 150°C. The five sizes run from 1/4" up to 1" tube OD — the 9/16" is their most popular for 3/8" tubing—and the thread forms are exclusively NPT or BSPT depending on what you order (we usually stock the ASME version but confirm lead time). ASTM F1387 covers the mechancial testing, so you're getting burst test data on teh actual production lot, not just a type certificate.
Tempearture floor sits at -20°C (which is fine for outdoor winter hydrotest rigs), but below that the nickel content in the 316 starts to lose impact toughness, so do not run them in a -40°C arctic skid without checking the materials certs first. We typically ship these as bare parts with the cone face protected by a plastic cap, avoid scratching that surface during insallation. The galvanized treatment is decent for preventing atmospheric rust during storage, but it is not subsea immersion.
MOQ depends on size and finish, but for standard 1/4" and 3/8" sizes in 316 stainless steel, we typically require 50 pieces. For larger sizes like 3/4" or 1", MOQ may be lower—just contact us for a quote.
Yes, the 20UE Series fittings are certified to ASTM F1387, and we can provide a certificate of compliance with your shipment. ABS, PED, and ISO 15500 certifications are also available upon request.
We can adjust the hex head dimensions for custom tooling, but the standard surface treatment is galvanized. For large orders, we can discuss alternatives like passivation or electropolishing—just let us know your specs.
For the 9/16" size in stock, lead time is usually 2-3 weeks. If we need to manufacture from raw material, it may stretch to 4-5 weeks, depending on current production load.
Store them in a dry, indoor environment away from moisture and corrosive chemicals. Keep the coned-and-threaded ends protected with caps or wraps to prevent damage—galvanized surface helps, but denting can still affect sealing.
