DO Type 205.5-280mm Floating Seal

The DO Type 205.5-280mm Floating Seal is a high‑chrome alloy casting iron component intended for large hydraulic and earth‑moving machines. It shares the same hardness range of HRC60‑72 as the smaller model, providing robust wear resistance. The seal is also rated for a service life of up to 4,000 hours, which aligns with the supplier’s standard warranty period. Its dimensional envelope spans an inner diameter of 205.5mm to an outer diameter of 280mm, fitting a broad class of heavy equipment bores.

Four rubber O‑ring options - NBR, VMQ, HNBR and FPM - are supplied to suit diverse temperature and chemical environments. In the industry, such floating seals are typically rated for pressures up to 25 MPa and operate comfortably between - 30°C and +200°C, which matches the performance envelope of most crawler bulldozers and hydraulic excavators. The product list also includes a series of part numbers that correspond to specific size increments, offering buyers precise matching to their machinery specifications.

This seal is widely used in domestic brand crawler bulldozers such as SHANTUI and XUANGONG, as well as in Komatsu, Caterpillar and German R‑series hydraulic excavators. Importers often request FOB or CIF shipping from the supplier’s Beijing base and look for sturdy wooden crate or metal pallet packaging to protect the heavy castings. Because the listing does not disclose exact MOQ or lead time, buyers should confirm these details together with any required ISO or SGS certifications before finalising the purchase.

Beijing Zhongnuo Sealing Technology Co., Ltd. operates from No.8, Ground Floor, Building 19 Jinyuchi West Area, Beijing 100050, Dongcheng District, China. Classified as an imported supplier with a harbor trust tier, the company’s trade credentials are verified by the platform’s sourcing system. The response rate recorded is 0.00% and no average response time is available, indicating that formal inquiry channels should be used for communication.

The firm focuses on manufacturing and exporting high‑performance floating seals for heavy‑duty sectors, offering a catalogue that spans multiple size ranges and material grades. While the supplier mentions compliance with international quality standards, the listing does not provide specific production capacity or client references, so buyers should request detailed technical datasheets and certification copies during negotiations.