In these types of bearings, the outer ring is not inserted in a rigid housing; therefore, we have a different distribution of the load, compared to the classic rolling bearing.

The load capacity Cw and Cow, indicated in the tables to the left of each bearing type, taking into account the elastic yielding of the outer rings under load, replace C and Co and must be used for the calculation of the theoretical duration (Cw) and to verify the static safety factor So (Cow).

The permissible dynamic radial load Fr indicated in the tables to left of each bearing type, must not be exceeded. The permissible strength of the material related to the bending stress on the outer ring and the contact surface pressure must not be exceeded.

The radial load Fr given has been calculated in contact with a flat track and with a coefficient of internal security. In special cases please ask Marcar.

Technical Characteristics

Outer rings are made from case-hardened steel UNI 20 MnCr 5 hardened at 60+2 HRCInner rings are made from bearing steel En 31 – SAE 52100 hardened at 62-2 HRCCylindrical rollers have flat ground heads, made from En 31 – SAE 52100 steel hardened at 59-64 arc welding bolts are made from low carbon steel The seals are in sliding lip (RS) or labyrinthBearings are supplied lubricated with grease grade 3.

Mounting Instructions

1) Bolt seating to be line bored.

2) Check orthogonality between axis and mast.

3) Bolt to be electrically dot welded so to create a weld line robe. The process will be speeded up if the heating up and discolouration of the bearing is avoided. It is therefore recommended to disassemble the bearing.

4) Use lithium based grease lubricant, with an NLGI3 consistency.