However, a deepgroove ball bearing with the code 688 mc3 has a bore size of 8 mm and a spherical roller bearing designated as 230560 cam e4 has a bore. The boundary dimensions for certain series of bearings are defined in various standards, such as abma, jis and iso. Bearing designations the designation of bearings follows a set model. In case of inch bearings, the bearing s first digit will be r. International standardization of bearing numbers has been examined by iso but not adopted. There are many different numbering systems used in the bearing industry today.
Roller bearings i n t rod u c t ion ball bearings sph erical roller bearings t a p ered roller bearings t h r u s t bearings sp li t p illo w bloc k s s u p er p recision bearings rolling m ill bearings l inear m o t ion e ngineering s ec t ion 6 table of contents ball bearings introduction about nsk ball bearings. Rqd signifies the degree of jointing or fracture in a rock mass measured in percentage, where rqd of 75% or more shows good quality hard rock and less than 50% show low quality weathered rocks. These basic designations are defined in the german din 623 standard and the relevant iso standard. For dimensional accuracy, these standards prescribe the tolerances necessary when installing bearings on shafts or in housings. Lt bearing with the grease for lower temperature, the additional letter is the same meaning as ht mt bearing with the grease for medium temperature, the additional letter is the same meaning as ht lht bearing with the grease for lower or higher temperature, the additional letter is the same meaning as ht. N11ca numbering system per din iso720 series 329 320x 330 331 302 322b 303 3 3x 323 323b cage design jp stamped steel cage f machined steel m machined brass tnp polyamide. If you are still unable to identify the correct bearing, then utilize the bearing specification guide. Bearing type dimensions dimensional and running accuracy bearing clearance further details the bearing designations of standard bearings are defined by jis b 15 and din 623. Diameter of the bearing bore d outer diameter d nominal width b height of the bearing t edge reduction r bearing dimensions and. A twodigit number is used for bore sizes from 20mm to 480mm. This is determined by the dimensions of the outer geometry of the bearing and includes. For dimensional accuracy, these standards prescribe the tolerances necessary when installing bearings on shafts or in. This simplifies mounting and dismounting, particularly when load conditions require both rings to have an interference fit.
Other bearings can be engineered for special requirements. Several skf innovations are worthy of par ticular note as they offer many. Download bearing designation systems book pdf free download link or read online here in pdf. Designation of bearings civil engineering projects. Dec 27, 2014 how the designation system works bearing types radial bearings, width b, t thrust bearing, height h outside diameter d bearing size d5 30 mm bore diameter. The basic designation of nsk bearing indicates the nsk bearing type and the bore size. The unit system section becomes read only on the other pages. In this post, we are going to discuss about the bearing in surveying and its designation. The composition of designations is subject to din 6231. Thus, we can easily identify now that in case of bearing 6305zz, the first digit 6 means the bearing type is single row deep groove ball bearing. Rbcs names and logos and all related trademarks including rbc bearing designations, series designations, and cone and cup numbers, tradenames, and other intellectual property are the property of rbc bearings and cannot be used without its express prior written permission. The most important codes for metric bearing series are listed in table 1. The company designs, makes and markets highperformance mechanical components.
Bearing designation systems 11 the basic designation consists of the code for the bearing series and the code for the bearing bore. For example, the most widely used astm metalliccoated sheet standard is a 653a 653m, which covers hotdip galvanized products. For example, the code 6318 stands for a deep groove ball bearing with a bore size of 90 mm. The third and fourth digit of bearing patter number indicates the bore size of bearing.
The rkb bearing industries group is a swiss manufacturing organization operating in the bearing industry for over 70 years, with 90. The complete designation is always marked on the bearing package, whereas the marking on the bearing may be incomplete or deviate from. This is important because misalignment is one of the big causes of bearing failure. General catalogue overview this new skf general catalogue contains almost all of the standard rolling bearings and accessories required by industrial equipment manufacturers, as well as those used for replacement purposes. If the bearing or application is not listed, contact your timken representative or visit to view the most recent application listings. Gurney started the manufacture of ball bearing machinery in jamestown, new york. Prefixes, suffixes figure12 bearing designations ws e1 c4222 14 xl 2rsr tvpa h40 l055 bearing series pre. To understand it better, lets take an example of inch bearing. In applications over the limiting speed, please cons ult nachi for assistance. Timken is your singlesource for friction management, with a full range of bearings and related accessories including greases, seals, tools, training, repair services and condition monitoring systems. To facilitate international bearing interchangeability and economical bearing production, bearing boundary dimensions have been standardized by the international standards. Skf y bearings insert bearings the designations for skf y bearings differ somewhat from those described in the basic designation system and are covered in the relevant product section. A rolling bearings major dimensions, known as boundary dimensions, are.
Read online bearing designation systems book pdf free download link book now. Wherever possible two or three subclassifications of bearing shall be accommodated under one major classification to ensure better utilization of the scheme. The bearing dimension tables show the rotating speed limits of standard rolling c ontact bearings as a criterion of bearing type selection. Bearing designations the designations of the bearings consist of a combination of numbers and letters. To download a pdf document of this catalogue and for information. For most nsk bearing types, the basic designation is made up of numbers, but some are alphanumeric. How to identify bearings by bearing number calculation. Sep 06, 2017 designation of bearings, bearing specification. The complete skf bearing nomenclature may consist of a basic designation with or without one or more supplementary designations. All books are in clear copy here, and all files are secure so dont worry about it. The abma part numbering system applies to new bearing. Products for railway applications schaeffler group. This number is multiplied by five to give the bore size. What is rqd rock quality designation and how to calculate it.
Product designations for skf rolling bearings typically contain information. The direction of a survey line can either be established with relation to each other or with relation to any meridian. In addition to assisting in bearing identification it helps to cross refer. Special bearings are available for the chain and mast guide, steel mill, rear wheel and pinion applications. How the designation system works bearing types radial bearings, width b, t thrust bearing, height h outside diameter d bearing size d5 30 mm bore diameter. Parameters for dimensions and structure of bearing designations.
Gurney also developed duplex bearings a matched pair of counterbored bearings which were a major contribution to the accuracy of high speed machine tool spindles. Bearings in this catalog are arranged by bearing type, with a size andor numerical listing. The designations of most skf rolling bearings follow a system that may consist of a basic designation with or without one or more prefixes andor suffixes basic bearing designation system. Within both the metric and inch systems, different part number systems have been developed. Designed to take large axial loads as well as radial loads. Series 320x,329,330,331,332 with bore diameters of up to 200 mm have the p6x tolerance as standard 312a. Bearing designation and identification bearing designation must allow the identification of every bearing so that the bearings marked by the same symbol could be dimensionally and operationally exchangeable. Cylindrical and tapered roller bearings ntn bearing corp. Instead of the prefix r, the following designation can also be used at nsk.
A new inch part numbering system was developed by the american bearing manufacturers association abma to address the expansion in the number of new applications and tapered roller bearing designs. Ball and roller bearings cad data of model numbers given in the catalog is available as an electronic catalog. To provide the highest levels of service, skf endeavours to have its standard assortment match virtually all cus. Skf bearing designation nomenclature nodes bearing. Jrk inner ring with rolling element and cage assembly if the prefix r cannot be used as. He originated the gurney radialthrust angularcontact bearing todays 7000 series in 1905, and the gurney radialtype r bearing same designation today in 1909. Iso designations, wherever applicable, shall be indicated. Series of a bearing denotes the toughness of the bearing. The part numbering systems for singlerow tapered roller bearings type ts are internationally recognized. The designation for the nsk bearing bore indicates the bearing s bore size.
Bearings used at high rotating speeds should generally have high accuracy. In my previous article, i discussed different types of bearings in compass surveying. Each coated steel sheet product has its own coating weight designation system, which is defined in the appropriate astm standard. Introduction coating weight mass measurement systems. We also strictly adhere to the timken quality management system in every plant worldwide, so each bearing product meets the. The designations of most skf rolling bearings follow a system that consists of a basic designation with or without one or more prefixes andor suffixes, as shown in the table and the examples below. Designation of bearings guide to compass surveying. Generally, the basic designation consists of an identification code of the bearing type, the dimensional series code and the bore diameter identification code. Several part number systems have been developed that can be classified according to metric or inch systems. Skf bearing designations not covered by the basic system.
Nsk bearing designation nomenclature prefixes suffixes. Thus, we can identify now that in case of bearing 6305zz, the second digit 3 means the bearing is of medium toughness. Design variant designation and comparison of tolerance class designations for singlerow tapered roller bearings. R bearing ring with rolling element and cage assembly of separable roller bearings.
Each bearing listing includes the appropriate dimensions. The designations for certain skf bearing types are either not covered, or are only partially covered. Din6231993 designation system for rolling bearings the document describes fundamental principles, designation and marking for rolling bearings. Bearing arrangements for tilting mechanisms and track stabilisation 36 bearing arrangements for the main bolsters 37 bearing arrangements for tilt drives 38 bearing arrangements for torsion bars, antiroll bars, suspension struts 39 bearing arrangements for gauge adjustment systems 40 bearing arrangements for braking systems 42. In order to promote public education and public safety, equal justice for all, a better informed citizenry, the rule of law, world trade and world peace, this legal document is hereby made available on a noncommercial basis, as it is the right of all humans to. This kind of ball bearing has a spherical outer race, allowing the axis of the bearing to wander around. In this article, we will discuss in brief different designations given to the bearings depending on measurement of angles. The contents cover basic designations for ball and roller bearing series and their prefixes and suffixes. Home decorating style 2020 for steel designation system pdf, you can see steel designation system pdf and more pictures for home interior designing 2020 83441 at manuals library. How to identify bearings by bearing number calculation and. The iso dimensional system specifies the following dimensions for rolling bearings. Stephen snyder began manufacturing filling slot radial.
There are hundreds of thousands of fag bearings part numbers, they are indicating different bearing types and structures, if you want to choose a suitable bearing for your industry machines, the first step is to identify the meaning of bearing designation and suffix. Bearing tolerances or dimensional accuracy and running accuracy, are regulated by iso and jis b 1514 standards rolling bearing tolerances. On system design jim waldo sun microsystems, inc 1 network drive burlington, ma 01803 1 781 442 0497 jim. The bearing rings themselves usually only feature the basic designation and some supplementary designations, such as radial clearance and accuracy.
Timken ball bearing housed units help improve efficiencies through. After r, the size of the bearing will be given in 116 th of an inch. Documents sold on the ansi standards store are in electronic adobe acrobat pdf format, however some iso and iec standards are available from amazon in hard copy format. Basic bearing designation system free download as pdf file. It is necessary, however, to deviate from this system and to interpolate numbers in the case of some carbon ranges and for variations in manganese, phosphorus or sulfur within the same carbon range. The system covers designations for singlerow bearings, doublerow bearings, and bearings with flanged outer rings.
Bearing in surveying definition, types and designation of. An example and the applicable options for spherical roller bearings are given below. The identification code of bearing type is listed in table 2. Bearing arrangements for gauge adjustment systems 40 bearing arrangements for braking systems 42 bearing arrangements for railcar bodies 45 bearing arrangements for connection of railcar bodies and bogies 46. Radial ball bearing nomenclature and numbering system. The designations of most skf rolling bearings follow a bearing designation system. This part numbering system has become the international standard for inchsized bearings. For example, in the grade designation 1035 represents a carbon range of 0. L19 6203 basic bearing series and size designation. Basic bearing designation system for rolling bearings. Nsk and rhp bearings designation systems the objective of this publication is to introduce and explain the designation systems used to identify nsk and rhp bearings. Bearing dimensions and designations parameters for.