Bearing is the heart of a machine and should be kept secured from undesirable forces. Bearing precision depends on the right choice of Housing & Sleeves and also safeguards the bearing installation and maintenance from high risk. As we apprehend this basic requirement, we have come up with a superior and classic range of Housing & Sleeves which will increase the bearing precision and life, manifold and cast out and unplanned machine down-time. Separate bearing housings are required for application where the bearings cannot be fitted directly inside the machine. Plummer blocks are the most commonly used types of bearing housings. These are predominantly designed for vertical loads directed towards the base.


A roller bearing having a tapered bore is mounted on a straight shaft using either an Adapter Sleeve assembly, or a Withdrawal Sleeve. Mounting a bearing on a sleeve also permits maximum flexibility in the axial positioning of the bearing on the shaft and can accommodate light locational thrust loads.

An Adapter or a Withdrawal Sleeve mounted bearing requires the correct reduction of Radial Internal Clearance of the bearing so as to prevent relative motion amongst the bearing inner ring, the sleeve and the shaft. Non-compliance with proper mounting procedures will invariably lead to hot running of the bearing and subsequently to it's premature failure.

Both the Adapter and the Withdrawal Sleeves have cylindrical bore and tapered outer surface, with threading on one side of the outer surface, and are slit along the length. While the Adapter Sleeve has the threading on the small diameter side of the taper, the Withdrawal Sleeve has the threading on the larger diameter side. Thus, the Adapter Sleeve facilitates easy mounting of the bearing, while the Withdrawal Sleeve is normally used to ensure easy dismounting of the bearing, hence it's name.

An Adapter Sleeve assembly consists of the Sleeve, a Lock Nut and a Lock Washer, because the Lock Nut is needed first to drive the bearing up the tapered sleeve, and then to lock it in position with the help of the Lock Nut. A Withdrawal Sleeve, on the other hand, does not necessarily need the Lock Nut and the Lock Washer for it's assembly with the bearing and the shaft, and hence is supplied without them. However, a Withdrawal Nut may required to remove the Withdrawal Sleeve from the bearing, and in that case, it has to be ordered separately.

The life of a bearing not only depends on the quality of the bearing, but on several other factors as well, which are equally important, such as :

a) Machining Accuracy:

For the bearing to achieve life, the contact between it's bore and the Sleeve as well as that between the bore of the Sleeve and the Shaft should be between 85% to 90% of the contact surfaces. Hence the correctness of the taper and cylindricity of the bore of the sleeve as well as the concentricity and finishing along with perfect roundness, play a great role in achieving the contact area parameter.

b) Material :

The Sleeves should be made from Carbon Steel as per established International Standard

Imported FKL Sleeves are manufactured from originally processed raw material (C20/C30) and machined in CNC machines to achieve the required machining accuracy and the surface finish, so that contact area is fully maintained to provide projected service life to the Bearing.

FKL Bearing Housing and Sleeve together is an ideal combination to meet and enhance service life criteria of Bearings.

N.B.: Beyond all sizes of sleeve (metric & inch) hydraulic type are also available.


These nuts are used for the detection of location of bearings and other components onto a shaft or adapter sleeve. One of the other utility of these are escalating bearings on the tapered shaft seats and descending bearings from the withdrawal sleeves.

Unintentional loosening of these locknuts are prevented by securing these nuts. The nuts are thus fitted with a locking device that engage a keyway in the shaft or a key slot in the adapter sleeve, or by a unique mechanism integrated in the nut that locks the nut.

It is better used with an integrated locking system as it is cost effective, reducing the cost of the keyway in the shaft. This also facilitates quicker installation as no separate locking device is needed.

Lock Washer

These washers are one of the simple but important elements that are reliable for fastening elements which engage a keyway in the shaft or key slot in the adapter sleeve.

These washers are used to lock the nut in a fixed position when one of the washer tabs are bent into a slot on the nut.

Oil Seals

These are fitted between machine parts in relative rotations; their name indicating that these are seals designed in form of ring that separate oil or grease present inside from the outer particles like dirt, water and dust. Mainly comprising of elastomeric diaphragm, shaped in the formation of a “lip” is reinforced with co-vulcanized metal insert. A “Greater Spring” energizes the sealing lip.

Seal Design

The sealing lip design corresponds to the current state of art and is based on many years of experience in a wide range of application fields. The sealing edge can either be ready molded or trimmed by mechanical cutting. The total radial force of the sealing lip is given by elastomeric pre-tension together with tensile spring force. The former depends on the deformation and elasticity of the rubber material, geometry of the sealing lip and interference between shaft and seal.