One-piece machined brass cages The one-piece form-turned window- type brass cage is an SKF innovation and represents the new generation of machined brass cages for SKF single row cylindrical roller bearings.The advantages of this machinedbrass cage include: • very high strength,• suitable for very high speeds andaccelerations,• suitable for high temperatures, • high endurance limit, • light weight design, and • excellent lubrication conditions inthe roller/cage contact zones.Bearings fitted with an inner or outerring centred,form-turned window-type brass cage are identified by the desig- nation suffix ML, e.g. NU 2314 ECML. Machined brass cages There are several machined brass cage designs available for SKF single row cylindrical roller bearings: roller guided cages and shoulder guided cages. Roller guided cages are centredon the roller complement and are typic- ally usedfor grease lubricated bearingarrangements. Shoulder guided cages are centred on one of the bearing rings and are typically used in oil lubricated applications. Two-piece machined brass prongedcages This cage is designed as a pronged cage with a cover. It features strong cage bars with machined trapezoidal shaped prongs that are peened in place.As a result, heat-induced expan-sion has no influence on cage strength. Depending on bearing size thisbrass cage is either • roller guided, designation suffix M,e.g. NU 232 ECM, or• outer ring guided, designation suffixMA, e.g. NU 232 ECMA,and in some cases there is a choice ofguidance for the same bearing size. Steel window-type cages A pressed steel window-type cage is available for a large number of bear- ings, mainly as an alternative to the standard P cage. Bearings fitted with a pressed steel cage are an excellent choicefor applications where hightemperatures or aggressive industrial lubricants make the use of a polyamide cage unsuitable. Such bearings are identified by the designation suffix J, e.g. NU 310 ECJ, or no suffix.

1

Product information

2

Recommendations

3

Product data Customer benefits Page ............. 16Page ............. 24

Cages made of three different materials

SKF single row cylindrical roller bear-ings are used in a wide range of appli- cations and subjected to very different operating conditions. As a result, no single cage could satisfy all possible demands. To meet the needs of design engineers, cages are made from three different materials:• polyamide,• steel and • brass.Bearings fitted with a polyamide cageare suitable for the majority of applica- tions. Metal cages are usually used for difficult operating conditions. Polyamide cages This injection moulded, window-type cage of glass fibre reinforced and heat stabilized polyamide 6,6 is the standard recommendation for SKF small and medium size single row cylindrical roller bearings. Its advantageous properties speak for themselves: • high elasticity,• light weight, • quiet running from good damping, • excellent tribological properties, and • very good behaviour under emer-gency running.These properties have been confirmedby the successful operation of millions of bearings. Bearings with this poly- amide cage carry the designation suffix P, e.g. NU 203 ECP. 6