{"id":1329,"date":"2026-07-13T06:36:17","date_gmt":"2026-07-13T06:36:17","guid":{"rendered":"https:\/\/lift-cylinders.com\/?p=1329"},"modified":"2026-07-13T06:36:17","modified_gmt":"2026-07-13T06:36:17","slug":"hydraulic-cylinder-port-fittings-and-thread-guide","status":"publish","type":"post","link":"https:\/\/lift-cylinders.com\/it\/application\/hydraulic-cylinder-port-fittings-and-thread-guide\/","title":{"rendered":"Raccordi per porte di cilindri idraulici e guida filettata"},"content":{"rendered":"
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TECHNICAL GUIDE \u00b7 PORT FITTINGS & THREADS \u00b7 HYDRAULIC LIFT CYLINDERS<\/span><\/p>\n

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Hydraulic Cylinder Port
\nFittings and Thread Guide
\nBSPP \u00b7 SAE \u00b7 Metric \u00b7 JIC<\/span><\/h1>\n

The port fitting is where every hydraulic hose connects to the hydraulic lift cylinder \u2014 and where the majority of hydraulic system leaks originate. A mismatched thread on a lift cylinder port, incorrect seal, or wrong port size can produce a leak on first pressurisation or only appears weeks later as the fitting gradually backs off under vibration. This guide covers the four principal thread standards used in lift cylinder ports \u2014 BSPP, SAE ORFS, metric, and JIC thread \u2014 including identification methods, sealing mechanisms, correct torque values, and the most common installation errors for each type.<\/p>\n

BSPP<\/span>
\nSAE ORFS<\/span>
\nMetric \u00b7 JIC<\/span><\/div>\n

LIFT CYLINDERS \u00b7 PORT FITTING ENGINEERING \u00b7 JULY 2026<\/p>\n<\/div>\n<\/header>\n

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REFERENCE \u00b7 LIFT CYLINDER PORT THREAD QUICK IDENTIFICATION<\/p>\n

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BSPP (G-thread)<\/p>\n

Parallel<\/p>\n

UK\/EU\/Asian standard \u2014 parallel thread, bonded seal or O-ring face sealing. Most common on European and Chinese-built lift cylinders<\/p>\n<\/div>\n

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SAE ORFS<\/p>\n

O-ring face<\/p>\n

USA standard \u2014 flat face with O-ring groove; most reliable seal for high-pressure lift cylinder applications in North America<\/p>\n<\/div>\n

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METRIC (DIN)<\/p>\n

Parallel<\/p>\n

German\/European DIN standard \u2014 metric parallel thread with O-ring face seal or bonded seal. Common on European-manufactured lift cylinders<\/p>\n<\/div>\n

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JIC (37\u00b0 FLARE)<\/p>\n

Taper seat<\/p>\n

USA thread with 37\u00b0 internal taper seat \u2014 metal-to-metal seal. Used on tube connections and some USA lift cylinder ports<\/p>\n<\/div>\n<\/div>\n<\/div>\n