ULTAGE: Defining the "Ultimate Stage"
The NTN 22218E ULTAGE spherical roller bearing represents a generational leap in rolling element technology. Developed by NTN Corporation in Osaka, Japan, the ULTAGE series is designed to satisfy the conflicting demands of downsizing equipment while increasing load capacity. By optimizing the internal geometry—specifically the roller diameter and length—NTN has achieved the world's highest load capacity standard for this size class.
Tapered Bore and Mounting
The suffix "K" in the part number 22218EAKD1 indicates a tapered bore with a 1:12 ratio. This design allows for precise installation on adapter sleeves (such as H318) or directly onto tapered journals. This is a critical feature for vibrating screens and crusher applications where the fit must be tight to prevent fretting corrosion, yet adjustable to set the internal clearance (C3 or C4) correctly.
NTN vs. The Competition
While the SKF Explorer series is a formidable competitor, NTN's ULTAGE series often outperforms in applications involving heavy shock loads due to its specialized cage design. The window-type pressed steel cage is lightweight yet extremely rigid, minimizing inertia during rapid acceleration. For purely radial load applications with lower misalignment, users might consider the Timken JM series, but for spherical alignment capabilities, the 22218E is unrivaled.
Industry Applications
This bearing is the "heart" of many industrial giants.
- Mining: Vibratory screens and jaw crushers.
- Paper Mills: Dryer rolls where high temperature is constant.
- Steel Manufacturing: Continuous casting conveyor rolls.
E-MARC supplies these units directly from NTN's manufacturing hubs in Japan and the USA, ensuring authentic provenance free from the risks of the grey market.