DO Type 280-480mm Floating Seal

The DO Type 280-480mm Floating Seal is a dynamic sealing component designed for rotating shafts in heavy machinery, with nominal diameters ranging from 280mm to 480mm. It features a split-ring design that accommodates axial and radial misalignment, reducing stress on shafts and housings. The seal operates under dynamic conditions where dust, moisture, and abrasive particulates are present, maintaining a consistent barrier without requiring frequent adjustment.

The seal housing is typically manufactured from hardened alloy cast iron, with surface hardness in the range of HRC60-72 to resist abrasion and deformation. The primary sealing element is a rubber O-ring made from NBR, VMQ, HNBR, or FPM, selected based on operating temperature and chemical exposure. These materials are standard in industrial sealing applications and offer resistance to oils, hydraulic fluids, and moderate thermal cycles. The floating mechanism allows for minor shaft runout without compromising seal integrity, a feature common in OEM-grade seals for earthmoving equipment.

This seal is used primarily in crawler bulldozers, hydraulic excavators, loaders, and tunneling machines where contamination control is critical to bearing life. Buyers include manufacturers of heavy machinery, maintenance contractors for mining and construction fleets, and OEM spare parts distributors. Trade terms typically include FOB China port, with packaging in inner boxes and outer cartons. Minimum order quantities are not specified in the source and should be confirmed directly with the supplier. Lead times for production are not stated and require direct inquiry.

Beijing Zhongnuo Sealing Technology Co., Ltd. is listed as an imported supplier with harbor trust tier, indicating it has been vetted for basic export compliance but has no verified response rate or average response time. The company's registered address is in Beijing's Dongcheng District, suggesting a corporate office location rather than a manufacturing facility. The listing does not confirm production capacity, workforce size, or years in operation. No certifications, client names, or factory audits are referenced in the source data.

The supplier appears to function as a commercial exporter or distributor of sealing components, sourcing products that meet standard industrial specifications. There is no indication of in-house design, testing, or casting capabilities. Buyers should verify whether this entity manufactures the seals or sources them from third-party factories. The absence of response metrics and verified production details means direct communication is required to confirm lead times, packaging, and quality control procedures.