HM263349DW/10/10D Four-Row Tapered Roller Bearing

Factual Dimensions: Fully verified sizing profile of 355.6 mm (inner bore) x 488.95 mm (outer diameter) x 317.5 mm (total width).
Four-Row Architecture: Engineered with four parallel rows of tapered rollers to maximize radial load capacity and manage heavy impact shocks in massive industrial mills.
Spacer Optimization: Includes custom-ground internal spacer rings to lock in the precise factory-engineered axial and radial play across the entire rolling assembly.

The HM263349DW/10/10D is an ultra-large, heavy-duty four-row tapered roller bearing assembly designed specifically for the work roll necks of heavy metal rolling mills and massive industrial crushers. The precise dimensions are 355.6 mm x 488.95 mm x 317.5 mm (Inner Bore x Outer Diameter x Total Assembly Width). Metal rolling mills operate under extreme, continuous radial crushing pressures. A standard double-row bearing cannot survive this environment; it requires the massive load distribution provided by four independent rows of tapered rollers working in unison.

This complex assembly consists of double cones (inner rings), single and double cups (outer rings), and precisely ground spacers. Because there are four rows of moving elements, internal clearance is absolutely critical. In our dedicated assembly workshop, we inspect and verify the entire four-row assembly as a single, inextricably matched unit. This strict hands-on quality assurance guarantees that the factory-set clearances are perfectly balanced across all four rows, preventing catastrophic premature spalling under the crushing weight of steel production.

Customized B2B Supply & Packaging Solutions:Our commitment to supplying a full range of bearing types means we are fully equipped to handle ultra-heavy industrial assemblies. The HM263349DW/10/10D is heavily coated in industrial rust preventatives and secured in reinforced heavy-timber export crating. We offer custom external branding for your heavy-industry distribution business and utilize secure, specialized maritime transit routes to ensure these massive matched tolerances remain completely undisturbed during shipping to industrial sectors in Russia, Africa, and South America.
Targeted Technical Clarifications (FAQ):

Q: Why use a four-row bearing instead of two separate double-row bearings?A: A four-row assembly provides vastly superior radial load capacity within the exact same housing bore, and it is pre-spaced at the factory to eliminate the need for complex clearance adjustments during installation on the rolling mill.
Q: Is it critical to keep the cups, cones, and spacers together as a matched set?A: Absolutely. Every component of this four-row assembly is custom-matched at the factory. Mixing components with other sets will completely destroy the engineered clearances and lead to immediate bearing failure.