Maintenance technicians in heavy industries know the pain of shutting down equipment for a simple bearing replacement. Traditional mounted bearings often mean hours of disassembly, craning out heavy components, and painstaking realignment.
This is where split bearings become a technician’s secret weapon. Split bearings, also known as split roller bearings, are an ingenious design that can dramatically reduce bearing-related downtime and maintenance headaches.
In this article, we’ll explain what split bearings are, how they’re designed, the types available (from split cylindrical roller to split tapered roller and even new split spherical designs), and why they offer game-changing advantages for maintenance professionals. We’ll also look at how split bearings excel in harsh conditions and highlight real-world success stories in industries like steel, mining, marine, cement, and power generation.
Understanding the Split Bearing Design
Split bearings are exactly what their name suggests: bearings whose components are split into two halves. Unlike a conventional one-piece bearing, a split bearing’s inner ring, outer ring, and cage with rolling elements are each manufactured in halves and bolted together during installation. This allows a split bearing to be assembled around a shaft in situ.
In practical terms, you don’t need to slide the bearing on or off the end of a shaft – you simply unscrew the halves and remove or replace the bearing without disturbing other components on the shaft. Installing a split bearing is significantly faster than installing a traditional bearing.
Learn more about how to install a split pillow block bearing →
Every piece of a split bearing (rings, cage, rollers, housing, seals) is split, enabling it to be positioned on shafts that are fixed in place or have complex attachments. You can literally build the bearing around the shaft, which is a fundamental reason these bearings save so much maintenance time.
How are split bearings designed?
The two halves of a split bearing are precision-machined to form a solid, aligned unit when clamped together. For example, SKF Cooper split bearings utilize advanced manufacturing techniques, such as wire-cutting of the inner and outer ring halves, to ensure perfect alignment and strength across the split joints.
The outer race halves often interlock with a special step joint or shroud for rigidity. High-strength steel clamp rings and multiple bolts hold the halves together securely during operation. The bearing typically sits in a special housing (often a swivel cartridge housing inside a split pillow block or pedestal).
This housing features a spherical or swiveling seat that allows the split bearing to self-align with the shaft and remain perfectly concentric, thereby maintaining the effectiveness of the seals. The split design does not compromise load capacity – in fact, split bearings come in robust series to handle loads ranging from light to extreme, both in radial and axial applications.
Types of Split Bearings
Split roller bearings are produced in a range of designs:
Split Cylindrical Roller Bearings
The original and most common type of split bearing is the split cylindrical roller bearing. These bearings use cylindrical rollers to carry heavy radial loads. They consist of an inner and outer ring split in half, with one or two rows of cylindrical rollers in a cage.
Some split cylindrical bearings have flanged outer races to handle limited axial thrust, or come in “fixed” (locating) and “expansion” types. For example, an expansion-type bearing’s inner race clamps to the shaft and allows axial movement for thermal expansion (like Cooper’s EXILOG design). Split cylindrical roller bearings are versatile and widely used for their high radial load capacity and ease of maintenance.
Split Tapered Roller Bearings
These bearings use opposed rows of tapered rollers and split inner/outer raceways. Double-row split tapered roller bearings can support significant radial and axial loads in both directions, making them ideal as locating (fixed) bearings on shafts where thrust loads are present.
By splitting the tapered bearing design, technicians achieve the same axial load handling while benefiting from in-place replacement. For example, a split tapered bearing might be used on a large fan or blower that experiences both radial loads from rotation and axial loads from air pressure – the split design allows for a quick swap without disassembling the entire fan housing.
Split Spherical Roller Bearings
A newer innovation in split bearing technology, these combine the self-aligning, high-load characteristics of spherical roller bearings with a fully split design. They feature two rows of spherical rollers and can accommodate misalignment like a standard spherical bearing, but each ring and cage is split for easy installation.
A major advantage of split spherical bearings is that they often can directly replace a standard spherical bearing in an existing plummer block housing. This means if a solid bearing in a pillow block fails in a “trapped” location (for instance, on a conveyor head pulley between a gearbox and a drum), you can retrofit a split spherical bearing into the same housing to avoid future disassembly hassles.
Split spherical roller bearings are particularly useful for high-throughput industries (mining, quarry, cement, steel) where conveyors or drives cannot be easily moved for bearing replacements.
The Pain Points of Traditional Bearings in Maintenance
To appreciate why split bearings are a boon, it’s important to consider the challenges technicians face with conventional (solid) bearings. Traditional bearing maintenance can be a time-consuming and risky endeavor, especially in large industrial equipment:
Extended Downtime
In many machines, a failed bearing means lengthy downtime. A solid bearing on a shaft usually requires removing couplings, gears, or other equipment from the shaft ends to replace it. If a bearing is in a “trapped” position – say between a gearbox and a pulley or deep inside a machine – maintenance crews might spend an entire shift or more just gaining access.
In mining and quarrying, replacing a standard conveyor pulley bearing can take up to 24 hours of downtime. Every hour the equipment is down means lost production.
For example, one case study noted that a failed bearing on a critical conveyor could shut down a coal operation for weeks if the bearing was a solid type, due to the extensive teardown required. Unplanned downtime incurs considerable costs – some sites estimate thousands of dollars in lost production per hour, not to mention labor expenses.
Heavy Disassembly & Reassembly
Changing a solid bearing often means major disassembly of surrounding components. Technicians may have to uncouple motors, lift heavy gearboxes or rolls, and move large shafts.
In a standard procedure to replace a trapped bearing, as many as 17 distinct steps might be required – including disconnecting couplings, hoisting the gearbox, removing the housing cap, bearing replacement, reassembling, and realigning everything. This process not only takes time but also requires heavy equipment, such as cranes or hoists.
In contrast, as we’ll see, a split bearing replacement might cut those steps by more than half (down to 8 steps or fewer).
Safety Hazards
Maintenance on large equipment poses significant safety risks, and these risks increase with the complexity of the job. Hoisting large components, working in tight or elevated spaces, and using pry bars or heavy wrenches all expose technicians to potential injury.
In industries like mining, a significant percentage of injuries and even fatalities occur during maintenance operations such as replacing conveyor bearings. Lifting a 3,000 lb gearbox or maneuvering a large shaft is not only strenuous but could also cause crushing injuries if something slips.
The more steps and heavy moves involved in a bearing change, the greater the exposure to accidents. Traditional bearings demand many of these risky steps during change-out, from rigging equipment to realigning shafts.
Alignment & Setting Issues
Even after the new bearing is installed, technicians must realign the drive trains and ensure everything lines up as before. Dismantling couplings and moving equipment can often throw off alignment. Couplings must be realigned using lasers or dial indicators, which takes more time.
If alignment isn’t perfect, the new bearing or other components could suffer premature wear. Traditional bearings essentially force a “reset” of alignment, whereas a split bearing swap (which doesn’t disturb most components) can preserve the original alignment.
Accessibility Challenges
Many bearings sit in hard-to-reach places – at the top of a conveyor head, inside a fan housing, at a middle section of a long shaft, or deep in a mill. With a solid bearing, limited access means a far more complicated removal process. Sometimes, entire drive shafts have to be slid out, or a piece of equipment must be lifted and moved to create clearance.
These scenarios are nightmares for maintenance crews. Technicians often joke that half the battle is just getting to the part that needs fixing. Unfortunately, with solid bearings, that’s not far from the truth.
In short, conventional bearings can make even a straightforward component replacement into an ordeal of downtime, labor, and hazard. This is exactly why split bearings have become the maintenance technician’s secret weapon – they directly tackle these pain points by making bearing replacement faster, safer, and easier.
Advantages of Split Bearings
Split bearings shine in maintenance because they were designed for maintenance. By being able to install and remove the bearing in place, maintenance professionals can avoid most of the headaches outlined above.
Here are the key benefits of split bearings and how they solve common maintenance issues:
Dramatically Reduced Downtime
The most notable advantage of split bearings is their ability to be quickly changed, unlike solid bearings. Since you do not need to disassemble surrounding equipment, a job that used to take a full day can often be done in a few hours.
In many cases, a split roller bearing replacement can reduce the mean time to repair (MTTR) by up to 65–70%.
Split bearing reduced downtime case examples:
- A mining operation found that replacing a standard trapped bearing on a conveyor took about 24 hours, whereas a split bearing could be replaced in only 8 hours – effectively cutting downtime to one-third.
- In one real-world case, a steel mill that retrofitted three conventional bearings with SKF Cooper split spherical roller bearings reduced their repair time by nearly 70%, saving over $350,000 in avoided downtime costs.
- Another case at a cement plant saw maintenance time go from days to hours, helping the plant avoid more than $1.2 million in costs by using a split bearing solution (more on this later).
For busy technicians, this time savings is priceless – it means faster fixes and less production loss.
In-Situ Replacement (Minimal Disassembly)
With split bearings, technicians perform replacements in place. There’s no need to remove drive couplings, lift gearboxes off their base, or take shafts out of service. Usually, the process is as simple as supporting the shaft (with jacks or blocks), unscrewing the split bearing housing cap, and splitting the bearing to remove it. The new split bearing is then placed around the shaft and bolted together, and the housing cap reinstalled.
There’s little or no disturbance to the shaft alignment or driveline components. This simplicity is a game-changer.
The ability to avoid dismantling big pieces of equipment also means that if you have partial failures (e.g. a seal or roller issue), you can inspect or replace just those parts easily by opening the bearing – something impossible with one-piece bearings.
In summary, split bearings allow quick, surgical strikes on bad bearings instead of requiring major surgery on your machine.
Improved Safety & Ergonomics
Maintenance safety is vastly improved when using split bearings. Since you eliminate many heavy lifts and complex rigging tasks, workers are far less exposed to hazards. Replacing a split bearing typically only requires slightly raising the shaft and supporting it, instead of hoisting large assemblies.
There’s no need to bring in a crane to pull out a gearbox or to hang off a conveyor structure wrestling a solid bearing off. The reduction in handling heavy components means lower risk of crushing injuries, sprains, or falls.
In industries like mining, where maintenance often happens on elevated conveyors or tight spaces, reducing these risky steps can save lives. It’s telling that maintenance-related accidents dropped significantly in some operations after adopting split bearings on troublesome equipment.
Additionally, technicians appreciate the ergonomics of split bearings – each half of the bearing carries only a portion of the weight, making it easier to manage. For instance, instead of pulling a 200-pound solid bearing off a shaft, you might handle two 100-pound halves separately, often with simple tools. Less strain on the crew means a safer, quicker job.
Preserved Alignment & Equipment Setup
Because split bearings don’t disturb the rest of the machine, alignment is typically maintained. The shaft and driver usually stay put, so once the new bearing is clamped on, you can often resume operation without re-aligning motors or couplings. This is a huge relief for reliability technicians, as aligning machinery can be a painstaking process.
It also means less chance of introducing misalignment-related issues (vibration, premature wear) that sometimes occur after a big teardown. Essentially, split bearings allow you to “swap the part without resetting the system.”
This benefit was highlighted in a case where a coal mine installed a split spherical bearing on a conveyor pulley – they did not have to alter shaft alignment at all, avoiding a tedious realignment process.
Lower Total Maintenance Cost
Faster repairs and fewer supporting resources (like cranes, special tools, or outside contractors) translate to cost savings. While the split bearings themselves may be an investment, their cost is often comparable to that of large conventional bearings, plus the avoided labor costs. Downtime cost is usually the most significant factor – by slashing downtime hours, split bearings frequently pay for themselves the first time a major failure is avoided or shortened.
Moreover, split bearings can encourage more preventive maintenance: since they’re easier to inspect (just remove housing cap) and replace, maintenance teams can address problems early rather than pushing equipment to run-to-failure (which often happens when changeout is too onerous). Preventing catastrophic failures saves tremendously on secondary damage and emergency repairs.
In short, split bearings offer a technician-friendly bearing solution that can significantly reduce overall maintenance expenses.
Industries & Applications Where Split Bearings Excel
Split bearings are used wherever machines have large shafts and minimizing downtime matters. Here’s how they bring value across key industries, along with some split bearing case studies from SKF Cooper Bearings:
Steel & Metal Processing
Steel plants run nonstop with massive equipment like conveyors, casters, and rolling mills. Downtime is expensive.
- A steelmaker cut repair time by 70% and saved $350,000 by replacing failed bearings on converter positions with SKF Cooper split spherical bearings.
- Used on link spindles, overhead cranes, fans, and cooling beds—especially where access is tight and torque loads are high.
Mining, Quarrying, & Bulk Handling
Heavy-duty operations with abrasive dust, long conveyors, and hard-to-reach shafts.
- Replacing a trapped pulley bearing once took 24 hours—now 8 hours with a split bearing.
- In one coal mine, a sealed SKF Cooper bearing saved over 10 hours on a single job and reduced gearbox handling risks.
- A cement plant avoided $1.26M in downtime by installing a split bearing without a crane.
Marine & Shipbuilding
Compact spaces and narrow service windows make quick maintenance critical.
- The Canadian Coast Guard switched to Cooper split roller bearings on generators, eliminating oil pumps and speeding service with no redesign.
- Bearings were installed between missions and now support multiple ships.
- Common uses include marine propulsion shafts, dredgers, and naval vessels—often using split tapered bearings for thrust loads.
Power Generation (Conventional & Renewable)
Used in fans, turbines, and generators where uptime is essential.
- Split bearings reduce downtime in coal pulverizers, draft fans, and generator drives.
- One thermal plant solved repeat failures in sleeve bearings with a custom Cooper solution.
- Wind turbines—especially offshore—benefit from in-place replacement when cranes are impractical or cost-prohibitive.
Manufacturing & Processing
Any plant with downtime-sensitive equipment can benefit.
- Found in paper mills, sugar mills, food processing lines, and cement kilns.
- Grain processing plants and HVAC systems report major savings and easier changeouts.
- Ideal for large rollers, fans, mixers, and bucket elevators in both light and heavy-duty applications.
SKF Cooper Bearings: Leading the Way in Split Bearing Solutions
When it comes to split bearings, Cooper Bearings is a name that stands out – and for good reason. Cooper (now part of SKF) was the inventor of the split roller bearing over a century ago, and the company remains a leader in advancing this technology. For maintenance technicians and engineers, Cooper Bearings (marketed under the SKF Cooper brand) are virtually synonymous with quality split bearings that you can trust in the most demanding situations.
A Legacy of Innovation: The world’s first split bearing was invented by Thomas Cooper in 1907. Since then, Cooper Bearings has focused exclusively on perfecting the split-to-the-shaft concept. Over the decades, they’ve developed a wide range – from the standard split cylindrical roller series to specialized designs – all with ease of maintenance in mind.
SKF’s acquisition of Cooper in 2013 only strengthened this legacy, injecting resources into new product development. Today, SKF Cooper offers the widest range of split bearings on the market, in inch and metric sizes, and for duties from light to “extreme”.
Comprehensive Product Options
Cooper’s product lineup has a solution for nearly every application:
- The four primary series of split cylindrical roller bearings (100, 01/01E, 02/02E, 03) cover shaft diameters from small (around 30mm) up to massive (600mm in standard series) with increasing load capacities. The series differ in robustness: 01 series for medium duty, 02 for heavy duty, 03 for extra heavy duty. This lets technicians select a drop-in replacement that matches or exceeds the original solid bearing’s capacity.
- Split tapered roller bearings are available for shafts ranging from 75mm to 180mm (and custom sizes beyond) to handle combined loads. Initially designed for marine shaftline thrust, they are also useful in fans and blowers where a solid thrust bearing is hard to change.
- Split spherical roller bearings – SKF Cooper’s latest innovation – come in standard plummer block sizes (140–200mm and 240mm to 450mm size ranges). These are unique on the market and allow upgrades of conventional SN/SAF housings to split bearings without changing the housing or shaft. The sealed versions offer enhanced protection and have won industry awards for their safety and uptime benefits.
- A variety of housings and mounting options: Cooper makes not just the bearings, but complete split bearing units, including pedestals (pillow blocks), flange housings, take-up units, and the innovative angled SNQ pedestal, which can be slid under a shaft easily. Their cartridges feature a swivel action for alignment and can accommodate different seal types. Cooper even offers flat pedestal designs to retrofit old sleeve bearing mounts (as seen in the icebreaker generator case).
- Large Bore & Custom Solutions: One of the strengths of Cooper Bearings is custom engineering. They have produced split bearings up to 1.5m in bore for extraordinary projects. They also build split thrust bearings (often used on large gearboxes in power plants or cement mills), combination bearings, and water-cooled units for high temperatures. If a maintenance problem can be solved by a split bearing, Cooper’s team can design it. For example, they once developed a triple-bearing hanger arrangement with air-purge seals for a customer’s conveyor – a fully bespoke split unit. This willingness to create technician-friendly bearings tailored to tough scenarios is what sets Cooper apart.
- Technician-Focused Support: SKF Cooper doesn’t just drop off a product and leave – they actively support maintenance teams. Their support documentation and training articles guide technicians on installation, lubrication, and vibration monitoring for split bearings. Cooper bearings are designed so that even if it’s your first time seeing one, the process is straightforward and well-documented.
Experience Paired with Strategic Partners
Many industrial suppliers (like IBT Industrial Solutions) partner with SKF Cooper to promote reliability improvements through split bearings. The message is consistent: reduce bearing downtime and improve safety by using split bearings where appropriate.
Cooper’s decades of field experience mean that if you have a particular trouble spot (say a fan that keeps burning out bearings because nobody wants to spend the 10 hours replacing them), they likely have a case study and solution ready. Indeed, their track record of success in steel mills, mines, marine vessels, and more makes them a go-to resource for reliability engineers.
SKF Cooper split bearings have become a trusted solution across industries by delivering the promised benefits of easier maintenance, longer life in harsh conditions, and overall lower costs. They back it up with a broad product range and support, making them a powerful ally for maintenance technicians looking to boost uptime.
