Timken Mounted Split Cylindrical Roller Bearings LS MS HS Series

Split cylindrical roller bearing units for shafts that cannot be dismantled

Timken mounted split cylindrical roller bearings are bearing assemblies in which the inner race, outer race, cage and housing all split in two so that the unit can be fitted or replaced on the shaft without pulling couplings, gears, pulleys or other equipment. Timken states that installation and inspection times are therefore dramatically less than for solid bearings, and that the savings come from reduced downtime and lost production. To inspect a unit you remove the support cap and the top half of the housing, and every bearing part becomes visible.

The units are used where access to the shaft end is restricted: line shafting, conveyors and screw conveyors, fans and blowers, gearboxes, ball mill and kiln drives, crushers, dryer rolls, pump drives and marine propulsion shafts, all listed in the catalogue application matrix across mining, cement, power generation, pulp and paper, water treatment and refining. Each unit carries a machined brass cage with a one-piece cage clip, profiled rollers and a pillow block, flange, hanger or take-up support in high-strength cast iron.

Technical specifications

Light series ratings by shaft size

The rows below are from the Timken catalogue bearing ratings table for the light series, where each shaft range shares one rating. The light series is the most commonly applied, offering good load and speed capability with the smallest section; the medium and heavy series have more load capacity and lower speed.

Nomenclature, bearing type and selection

A Timken reference reads left to right: series prefix (LS, MS, HS), unit of measure (E imperial, M metric), shaft size, unit type and suffixes. For example LSE108BXHATL is a light series 1 1/2 in. bearing with housing and ATL seals; BX is an expansion bearing and BR a retained bearing, BXH or BRH adds the housing, and BXHS or BRHS adds the support. Suffixes cover clearances (C3, C5), end covers (EC), temperature probe holes (TE), grease escape (GE) and other options listed in the catalogue.

Choose the bearing type by the shaft arrangement. The retained type has integral flanges on the outer race to locate the shaft axially and take axial load, and only one retained unit should be mounted on a shaft, with no other locating bearing on that shaft. The expansion type takes radial load only and lets the rollers move across the outer race as the shaft expands or contracts. Life is calculated on radial load only, using L10 = (C/P) to the power 10/3, with a load factor Fz of 1.0 to 1.3 for steady loads rising to 2.0 to 3.0 for heavy shock. Confirm shaft tolerances and the seal arrangement for the environment.

Related Timken products: Timken Solid-Block Mounted Spherical Roller Bearings Pillow Blocks, Timken SNT Split Plummer Block Housed Spherical Roller Bearings, Timken Type E Mounted Tapered Roller Bearings Pillow Blocks and Flanges, Timken SAF Split Block Mounted Spherical Roller Bearing Pillow Blocks, Timken Fafnir Mounted Ball Bearings Pillow Blocks and Flanges and Timken Corrosion-Resistant Mounted Ball Bearings Stainless and Polymer Housings.

Documents and ordering

The attached document is the full Timken Mounted Split Cylindrical Roller Bearing Catalog (100 pages), with the engineering section, nomenclature, support and seal references, assembly instructions and product tables for the light, medium and heavy series. The picture is the exploded unit drawing from that catalogue. Send the full reference such as LSE108BXHATL, shaft size, bearing type, seal type and quantity. Other roller bearings are grouped under Mounted Bearings & Housings. Seven Star LLC is an independent supplier in Muscat; availability and lead time are confirmed per enquiry.