Marcar is the UK’s leading supplier of BEARINGS AND specialist steel sections to the materials handling industry.
The Marcar Steel and Metal Company was established in 1948. Acting as exclusive agents for West German manufacturers, our initial activities were in the sphere of iron and steel, engineering products and railway materials. In 1954 mining equipment was added to our programme.
Our interests today cover a wide spectrum. We represent some of Europe’s leading producers in their field as exclusive agents and distributors in a very diverse range of engineering products. These include heavy engineering, power engineering, offshore, mechanical handling, construction, hydraulic, automotive, together with high precision stainless steel for surgical and medical applications.
Marcar Steel and Engineering Ltd is divided into specialist business units. In this way, each unit is able to adapt precisely to the particular needs of the market segment that it services.
The stockholding and distribution division was established in 1987 to complement and strengthen our traditional activities, enabling the group to supply a wider range of customers.
Our diversity and range of activities place us in a strong and unique position to embrace the challenges of the new millennium.
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.
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.
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.