Stainless Steel and Carbon Steel Hydraulic Quick Coupling with Multiple Thread Systems

When hydraulic connections leak under high pressure, you’re not just losing fluid—you’re risking downtime and safety, and the root cause is often mismatched threads or poor sealing surfaces. That’s what this coupling addresses, basically, by offering multiple thread systems like NPT, BSPP, BSPT, JIS, SAE, UNF, Metric, and ISO tapered all in one fitting, so you don’t have to swap parts for different setups.

it have flat O-ring and cone seat connection surfaces, which are better than basic flat seals for high-vibration lines—most buyers go with the multiseal option for gas application. We test every batch with HPLC checks on seal integrity, not just a visual once-over, and COAs are issued per lot (usually within 3-5 days of your order).

We run a tight retest policy: if your batch fails incoming inspection, we’ll replace the whole lot within 10 working days or so, no questions asked. That’s been standard for us, even though we’re a YC-LOK shop in China—the MOQ is 50 units for custom thread combos, but stock items ship form plastic-box pallets in 7 days.

The body is available in straight, 45-degree, or 90-degree elbows—well, the 90-degree is easier to route in tight spaces, but the straight version handles higher burst presure (roughly 15% more). It’s not suited for potable water lines, though, because carbon steel option, even with standard cleaning, can rust over time in constant wet contact.

Also, we only supply DIN or GB standdard as default—so if you’re running JIC or SAE threads, confirm the hex head size at ordering since tolerances shift about 0.2mm between standards. A common thing buyers miss is that the cone seat connection requires a slightly different O-ring durometer for gas versus hydraulic fluid; we note that on the COA but don’t always flag it unless asked.

Packaging is plastic-box and pallet, roughly 200 units per layer, and HS code is 7307290000 for customs. We usually have stock in stainlss steel grades, but carbon steel lead times can stretch to 4-6 weeks depending on thread type—check before ordering if you’re in a hurry.