BMI Mounted Bearings Spherical Series

Ready for use Out-of-Box

Bearing cavity is 33% factory filled with Shell Alvania #2 grease.
Has 1/8” NPT grease fitting and also fits automatic grease dispensers.

Easy to Reorder

Removable metal tag makes reordering easy.

Shaft Expansion

Available in Non expansion (fixed) and Expansion (floating)

Double-Lip Seals

Extra protection against contamination, but still allow high speed operation.

Drop-In Interchanges with:

Dodge S2000
Browning SPB1000
Linkbelt PB22400
Rex ZA2200
SKF SYR

Self-Aligning

Internally self-aligns to accommodate changes in shaft and machinery alignment for maximum bearing life.

Locking Collar

Use of mild steel collar ensures precision threads, maximizing setscrew grip.

Sturdy Housing

A one-piece cast iron housing has strength to handle rough applications.

Solid Base Block

Advantages :

• Save money and reduce cost
• Longer life
• Reduce downtime
• Maximize and improve productivity
• Improve reliability of your operations

BMI is proud to offer an online edition of the Industrial catalogue for users engaged in designing, development and purchasing of bearings. The catalogue provides an overview of the entire range of bearings that BMI is able to offer. Beside the standard catalogue bearings BMI also regularly manufacturing obsolete and nonstandard bearings from samples by reverse engineering as well.

The catalogue covers the entire range of Inch taper and special taper roller bearings as well for the American market. Given the wide variety of bearing sizes used in the industrial market. BMI will constantly try to update the range.

However if you are unable to find any size in the catalogue feel free to contact our team and we will be happy to help you.

BMI is now able to offer the entire range of sealed spherical roller bearings starting from BS2-2206- 2CS in regular production. The design is similar to European standard with similar load carrying capacity. Lithium complex EP grease from SKF (LGWA 2/1) grease is used for higher than normal life expectancy of the bearing.

The quality of seals used along with the super finishing of raceways provide higher life.

BMI sealed spherical roller bearings are designed to high load, mis-alignment, contaminants and more. Sealed spherical enhance service life of bearings by keeping solid contaminants and moisture of the bearing.

From designers’ perspective downsizing is possible as service life is higher. Application: for continuous casting plant conveyor belts, food industry.

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MAINTENANCE TIPS: Bearing Heating

Heating is a standard method for mounting medium to large-sized bearings onto a shaft (smaller bearings are typically pressed on cold). This process must be performed carefully using one of the following three approved methods:

1. Induction Bearing Heaters
2. Electric Ovens
3. Hot Oil Baths

Critical Considerations:

• Temperature Control: Accurate temperature control is essential to prevent bearing damage. Exceeding 250 degrees Fahrenheit (approx. 121°C) risks altering the bearing’s metallurgical grain structure, leading to a loss of hardness and reduced wear life.
• Sealed Bearings Warning: Sealed or shielded bearings must never be heated and should only be mounted cold, as heat will damage the seal material.
• Prohibited Method: Never apply an open flame (e.g., a torch) directly to a bearing. Flame temperatures far exceed safe limits, and this practice almost guarantees premature bearing failure.

BMI’s engineering team was approached by a European customer with a requirement for a special full-complement CRB (with self-holding rollers). With a total weight of around 9 kg and an outer diameter of 170 mm, the bearing features an offset track and special spring seals for a contaminated working environment. The bearing, intended for a steel mill application, was to be used in harsh conditions.

After preliminary analysis, engineering confirmed the possibility of developing the bearing for the customer. BMI then developed the entire design of components and manufacturing process based on the application. Engineering suggested a radius of 3500 mm (for line contact) on the outer diameter of the outer ring after evaluating the application in detail.

BMI’s production team proceeded with the manufacturing and development of the special bearing. Within 12 weeks, production was able to hand over the finished product, including development time for tooling. After successful testing of 8 pieces, BMI is now engaged in the development of 3 more special bearings for the European customer.

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MAINTENANCE TIPS: Alignment

Correct alignment of all devices in contact with the bearing shaft cannot be overemphasized. All components of the shaft must work together in correct alignment to prevent damage. A misaligned motor shaft will eventually cause abnormal wear of the bearing, leading to even greater misalignment. This can be an even greater hazard if a driving gear set is attached to the shaft—not only can this misalignment be transferred to the gears, but it may also go on to cause bearing damage and misalignment in the driven components.

Along the same lines, a soft foot within a large bearing housing or pillow block can cause uneven bearing wear. Prior to aligning a unit, a soft foot check should be performed on the bearing housing. This check must be completed to guarantee the proper reaction of any realignment shim changes that will be made.

01 A HEFTY CHALLENGE: Tailor-made 4 row cylindrical bearings

An Italian customer recently challenged the BMI team’s strong engineering knowledge to develop a special 4 Row Cylindrical Roller Bearing for heavy machinery for steel plant application.

Weighing nearly 40 kgs with an outer diameter of 290mm, this bearing was one of the most challenging projects taken up by BMI. The BMI production team successfully executed the project within a short span of 12 weeks.

To deal with the heavy radial load application, the engineering team used Special steel 100CrSiMn6 for better results. The grading of cylindrical rollers was achieved within 3 microns for better accuracy. Given the satisfactory performance of the bearings customer has expressed interest in developing other large bore bearings for their machinery. Not only was BMI able to offer performance equivalent to European brands we were also able to offer faster delivery and smaller MOQ (Minimum Order Quantity).

This customer breakthrough was very important for BMI to establish its name in the steel industry as this customer has a long standing reputation for building machines for steel plants for more than 50 years.

02 MAINTENANCE TIPS: Grease lubrication

Anti-friction bearings consist of some type of rolling element confined within an inner and outer ring.

In normal operating conditions, anti-friction bearings can be grease lubricated. The free space in the housing and bearing should only be partially filled with grease. 30% to 50% grease in the bearing housing is considered adequate.

Take care not to overfill the grease as this may cause a rapid rise in temperature, particularly at high speeds or it may prevent a bearing that is designed to float in its housing from operating properly. Bearings operating at slow speeds and those that require corrosion protection may have their housings completely full of grease. Additionally, over-filling.

If re-lubrication is not possible at frequent intervals due to operating conditions, it is sufficient to open the bearing housing to remove as much used grease as possible from the bearing. Then, repack fresh grease between all the rolling members from one side only.

Some provision is made for regreasing, usually in the form of a grease nipple fitted to the bearing housing if frequent re-lubrication is possible. A grease gun adds fresh grease to the bearing and replaces the old grease.

The lubrication duct in the housing should either feed the grease adjacent to the outer ring face, or, preferably, into the bearing by means of the lubrication groove. After numerous re-lubrications, the bearing housing should be opened and the used greased removed before fresh grease is added.