{"id":1238,"date":"2025-05-02T14:53:48","date_gmt":"2025-05-02T06:53:48","guid":{"rendered":"https:\/\/hengoseal.com\/?p=1238"},"modified":"2025-05-02T14:53:48","modified_gmt":"2025-05-02T06:53:48","slug":"idu-vs-odu-hydraulic-seals","status":"publish","type":"post","link":"https:\/\/hengoseal.com\/uk\/idu-vs-odu-hydraulic-seals\/","title":{"rendered":"IDU vs ODU Hydraulic Seals: What\u2019s the Difference and Which One Should You Choose in 2025?"},"content":{"rendered":"

If you\u2019re confused between IDU and ODU seals for your hydraulic system, you\u2019re not alone. These symmetrical piston seals are easy to mix up\u2014but they serve different purposes.<\/p>\n

IDU and ODU seals are double-acting piston seals, both widely used in high-performance hydraulic cylinders. But understanding their structure and function is key to choosing the right one in 2025.<\/p>\n

Let\u2019s break down the core differences and help you make the best selection.<\/p>\n

What is an IDU hydraulic seal?<\/h2>\n

An IDU seal is a symmetrical piston seal designed for double-acting hydraulic cylinders.<\/p>\n

It consists of a sealing element (usually made of NBR, PU, or FKM) and two support rings that prevent extrusion. IDU seals are ideal for medium-to-high pressure systems with alternating motion.<\/p>\n

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Their symmetry allows for easy installation without worrying about orientation. If your system requires a balanced sealing load in both directions, the IDU hydraulic seal<\/a> is a smart option.<\/p>\n

What is an ODU hydraulic seal?<\/h2>\n

ODU seals are also symmetrical double-acting piston seals\u2014but typically used when higher extrusion resistance<\/strong> is needed.<\/p>\n

They feature a slightly stiffer profile and are preferred in heavy-duty applications like hydraulic presses, steelworks, or construction cylinders.<\/p>\n

Compared to IDU seals, ODU designs can handle more aggressive pressure spikes. They are often selected for rugged environments or large-diameter pistons.<\/p>\n

Need help deciding? Compare them in the table below.<\/p>\n

What\u2019s the difference between IDU and ODU seals?<\/h2>\n\n\n\n\n\n\n\n\n\n
\u041e\u0441\u043e\u0431\u043b\u0438\u0432\u0456\u0441\u0442\u044c<\/th>\nIDU Seal<\/th>\nODU Seal<\/th>\n<\/tr>\n<\/thead>\n
\u0421\u0442\u0456\u0439\u043a\u0456\u0441\u0442\u044c \u0434\u043e \u0442\u0438\u0441\u043a\u0443<\/td>\nUp to 30 MPa<\/td>\nUp to 40 MPa<\/td>\n<\/tr>\n
Extrusion Resistance<\/td>\n\u041f\u043e\u043c\u0456\u0440\u043d\u0438\u0439<\/td>\n\u0412\u0438\u0441\u043e\u043a\u0438\u0439<\/td>\n<\/tr>\n
\u0437\u0430\u0441\u0442\u043e\u0441\u0443\u0432\u0430\u043d\u043d\u044f<\/td>\nGeneral cylinders<\/td>\nHeavy-duty, large bore<\/td>\n<\/tr>\n
Material Flexibility<\/td>\n\u0412\u0438\u0441\u043e\u043a\u0438\u0439<\/td>\n\u041f\u043e\u043c\u0456\u0440\u043d\u0438\u0439<\/td>\n<\/tr>\n
\u041f\u0440\u043e\u0441\u0442\u043e\u0442\u0430 \u043c\u043e\u043d\u0442\u0430\u0436\u0443<\/td>\n\u0421\u0438\u043c\u0435\u0442\u0440\u0438\u0447\u043d\u0438\u0439<\/td>\n\u0421\u0438\u043c\u0435\u0442\u0440\u0438\u0447\u043d\u0438\u0439<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

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Both seals are available in customized rubber options<\/a> if you need non-standard grooves or special media resistance.<\/p>\n

How to choose between IDU and ODU piston seals?<\/h2>\n

Ask yourself:<\/p>\n

    \n
  1. What pressure range will the cylinder operate in?<\/li>\n
  2. Will the piston face frequent reversals or high shock loads?<\/li>\n
  3. Is extrusion a risk due to large clearances or groove wear?<\/li>\n<\/ol>\n

    If your system is compact and standard, an IDU seal is sufficient. But if you\u2019re dealing with long strokes, wide tolerances, or sudden load spikes, choose ODU.<\/p>\n

    In mobile machinery or excavator cylinders, combining KDAS buffer seals<\/a> with ODU can significantly reduce wear and maintenance cost.<\/p>\n

    Where are IDU and ODU seals typically used?<\/h2>\n\n\n\n\n\n\n\n
    \u0422\u0438\u043f \u0443\u0449\u0456\u043b\u044c\u043d\u0435\u043d\u043d\u044f<\/th>\n\u0417\u0430\u0433\u0430\u043b\u044c\u043d\u0456 \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u0438<\/th>\n<\/tr>\n<\/thead>\n
    \u0421\u0406\u041d<\/td>\nAgricultural cylinders, forklifts, presses<\/td>\n<\/tr>\n
    ODU<\/td>\nSteel equipment, cranes, large pistons<\/td>\n<\/tr>\n
    \u041e\u0431\u0438\u0434\u0432\u0430<\/td>\nInjection molding machines, industrial hydraulics<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    At Hengoseal, we stock both IDU\/ODU piston seals<\/a> in standard sizes and offer OEM-matching service for legacy cylinders.<\/p>\n

    \u0412\u0438\u0441\u043d\u043e\u0432\u043e\u043a<\/h2>\n

    Choosing between IDU and ODU seals depends on your pressure, stroke, and system demands. Both offer excellent double-acting sealing\u2014but the details make all the difference.<\/p>\n

    Request the perfect piston seal for your system<\/h2>\n

    \ud83d\udce9 Mail:info@hengoseal.com
    \n\ud83d\udcde WhatsApp\uff1a+86 17622979498<\/p>\n

    Related topic<\/h2>\n