DO Type 129-168mm Floating Seal

The DO Type 129‑168 mm floating seal is a heavy‑duty sealing component used in large crawler and hydraulic equipment. It is cast from high‑chrome alloy iron, giving a hardness between HRC 60 and 72 and a service lifetime of approximately 4 000 hours under normal operating conditions. The seal incorporates a rubber O‑ring that can be supplied in NBR, VMQ, HNBR or FPM compounds to match the required chemical resistance. Its design tolerates the high‑impact forces typical of earth‑moving machinery.

Standard size offerings cover inner diameters from 129 mm up to 168 mm, which matches the dimensions indicated in the product name. Typical pressure ratings for seals of this class are up to 10 MPa, and they operate reliably between - 30 °C and 80 °C, which is common for casting‑iron seals. Industry practice follows API 682 and ISO 9001 quality frameworks, although the supplier’s specific certifications are not listed. The O‑ring groove tolerances are generally ±0.05 mm, a standard dimension that ensures proper compression and seal integrity.

These seals are fitted to a broad selection of equipment including SHANTUI, XUANGONG, PENGPU, ZOOMLION, LONKING, YISHAN, XGMA and LIUGONG crawler bulldozers, as well as Komatsu, CAT and German hydraulic excavators. The supplier offers flexible order quantities, allowing both single‑unit purchases for prototype testing and bulk shipments for fleet maintenance programs. Packaging is performed in reinforced wooden crates with protective padding to prevent damage during sea freight. Shipping terms are typically FOB or CIF from Beijing ports, and buyers should confirm the exact incoterm and any required documentation before finalising the purchase.

Beijing Zhongnuo Sealing Technology Co., Ltd. is situated on the ground floor of Building 19, Jinyuchi West Area in Dongcheng District, Beijing, China. The company is recorded as an imported tier supplier with a harbour‑level trust rating, and no response time data is currently available.

The firm manufactures high‑chrome alloy casting‑iron floating seals and supplies them in a variety of sizes and rubber‑O‑ring configurations. Trade conditions include flexible minimum order quantities, reinforced wooden crate packaging, and FOB or CIF delivery from Beijing ports. No additional corporate history or client list is provided beyond the details given in the listing.