In heavy industrial equipment such as metallurgical rolling mills, large conveyors, paper machine rollers, mining crushers and port ship unloaders, bearing installation positions are often located in the middle of long shafts or inside enclosed structures that are difficult to access. Once a conventional solid bearing fails, replacement becomes extremely complex—couplings must be disconnected, motors moved aside, entire drive shafts extracted, and sometimes surrounding structural components must be dismantled just to reach the bearing location. A single replacement operation can take days or even a week—and the economic losses from extended production line downtime far exceed the value of the bearing itself. For continuous-operation steel mills, paper mills and port terminals, this magnitude of downtime is virtually unacceptable.

 

Japan NMT split bearings are innovative products engineered specifically to solve the bearing replacement challenges of large equipment. NMT split bearings divide the inner ring, outer ring, cage and rolling element assembly of conventional solid bearings precisely into two halves along the diametral direction, using high-strength bolts to connect the two halves into a complete bearing unit. For replacement, there is no need to remove drive shafts, couplings or any adjacent components—simply open the split faces at the bearing location, remove the old bearing and install the new one. Total replacement time is reduced from days to hours, with equipment downtime reduced by more than 80%.

 

NMT split bearings are manufactured to extremely high standards for split-face precision and connection strength. The split faces of both halves undergo precision wire EDM cutting, achieving exceptionally high mating surface finish and flatness that ensure roundness and coaxiality after assembly that are indistinguishable from solid bearings. High-strength bolt preload is precisely calculated and rigorously controlled, ensuring the two halves form a rigid integral structure under load—no relative displacement from load changes or vibration. Rolling elements are also specially designed at the split position—the split face passes through the raceway at locations that avoid dense rolling element clusters, ensuring smooth passage of rolling elements across the split position during operation without impact or jamming.

 

NMT split bearings maintain the same materials and heat treatment as premium solid bearings—high-purity bearing steel with precise quenching and tempering processes, with no compromise whatsoever in raceway hardness or wear resistance. The sealing system similarly adopts a split design, with seals divided at corresponding locations and featuring special overlap structures at the mating interfaces—forming a complete sealing ring after assembly that maintains reliable sealing performance in dusty, moist, high-temperature and other harsh environments.

 

Reasons for selecting NMT split bearings:

 

Split-type design enables quick replacement without disassembling drive shafts

 

Replacement time reduced by more than 80%—from days to hours

 

Precision wire EDM cut split faces with roundness and coaxiality equal to solid bearings

 

High-strength bolts with precise preload ensure the two halves form a rigid integral structure under load

 

Rolling elements pass smoothly across split positions without impact or jamming

 

Materials and heat treatment identical to premium solid bearings—no performance compromise

 

Split-type sealing system with complete sealing ring after assembly

 

Dramatically reduces maintenance downtime costs and improves overall production line efficiency

 

These practical features establish NMT split bearings as the ideal choice for equipment maintenance and replacement in steel metallurgy, mining, paper, port and large-conveyor heavy industries.

 

Application scenarios

 

Metallurgical rolling mills and continuous casting equipment, large belt conveyors and bucket elevators, paper machinery press and dryer rolls, mining crushers and mills, port ship unloaders and stacker-reclaimers, large wind turbine main shafts, marine propulsion shafting, cement rotary kilns and tube mills.

 

Precision manufacturing

 

Produced according to Japanese industrial standards and split bearing manufacturing specifications, NMT split bearings utilize high-purity bearing steel subjected to precision forging, quenching and tempering heat treatment, split-face wire EDM cutting, split-face precision grinding, precision rolling element sorting, high-strength bolt precision assembly, split-face mating accuracy inspection, rotational accuracy verification, seal performance testing and load capacity validation—ensuring every product delivers convenient replacement, reliable load capacity and lasting precision.

 

Product range

 

Split cylindrical roller bearings, split spherical roller bearings, split deep groove ball bearings, split angular contact bearings, split thrust bearings, sealed split bearings and custom non-standard split bearings.

 

Global industrial service

 

Japan NMT supplies high-quality split bearings to global steel metallurgy, mining, paper, port and large-conveyor equipment manufacturers, empowering heavy industry equipment efficiency improvement and maintenance cost reduction with split-type precision engineering and fast-change practical value.