ENGINEERING.Technical SuperiorityBEARING1. Identify Application Parameters:Shaft Speed in RPM:Desired Operating Life in Hours:Bearing Loads in herOperating Temperature:-30 to 200 F *200 to 400 F-100 to -30 F *SELECTIONGUIDE2. Select Bearing Type and Bore:Check Ball and Roller Bearing Ratings. Pages 178-186.Selected Bore Size:Bearing Type:BallRoller3.Select Housing Type. Page 187.Housing Selected:4.Select Seal Design. Pages 188-189.Seal Selected:Felt SealOther5.Contact SealSelect Lock Mechanism. Pages 190-191.Shaft Lock Selected:Single Lock Set ScrewDouble Lock Set ScrewSkwezloc (Ball Bearings Only)6. Refer to . Pages 10-13For Ball Bearing Nomenclature and Pictorial index to locate DimensionalSpecifications.Refer to . Pages 96-97For Roller Bearing Nomenclature and Pictorial index to locate DimensionalSpecifications.Bearing Selected:7. For Application Parameters outside capabilities of selected components.*Contact Application Engineering (630-898-9620) or you can fax theApplication Worksheet on Page 207 to (630-898-6064).For Ordering Information. Contact Customer Service (800-354-9820)176
TABLE OF CONTENTSBall Bearing Selection . Pages 178-181Tapered Roller Bearing Selection . Pages 182-183Sample Calculations . Pages 184-186Housing Selection . Pages 187Seal Selection. Pages 188-189Lock Selection . Pages 190-191Bearing Basics . Pages 192-193Vibration Analysis.Ball Bearings . Page 194Roller Bearings . Page 195Lubrication . Page 196Recommendations . Page 197Fittings . Page 198-199Installation.Shaft Mounting Procedures .RPB Taper Roller Bearing Cartridge.Removal and Replacement .Recommended Shaft Tolerances.Bore Tolerances .High Speed- High Load Applications .Set Screw and Capscrew Information .Page 200Page 203Page 204Page 204Page 205ER, SC, and ERCI Housing Recommendations . Page 206Application Worksheet . Page 207Refer to Application Section . Pages 128-143to review a variety of Operational Conditions177
BALL BEARING RATING & SELECTIONBearing Life CalculationWhile both Ball and Roller bearings may be considered as possibledesigns on a given application, the formulas and calculations are differentand will be treated separately. Typically, Ball bearings are usuallyspecified on applications with lighter loads but have a higher speedcapacity. As Ball bearings usually cost less for a given shaft size theyare considered first. If the desired life or load capacity cannot be achievedwith a ball bearing then a tapered roller bearing should be considered(see page 182 for Tapered Roller bearing life calculations).CPL10LnaFaFr-BEARING SYMBOLS FOR LIFE CALCULATIONBasic Dynamic Rating (lbs)C0 - Static Rating (lbs)Equivalent Radial Load (lbs)n - Speed (RPM)Rated Life (Hours)K - Geometry FactorAdjusted Rated LifeX - Radial FactorApplied Thrust Load (lbs)Y - Thrust FactorApplied Radial Load (lbs)e - Geometry RatioThe following formula provided by the Anti Friction BearingManufacturers Association (ABMA) provide a method for calculatingestimated fatigue life of Ball Bearings.L10 (C/P)Mounted ball bearings are typically “slip fitted” to the shaft and rely ondesign features such as the inner race length and locking device forsupport. ABMA recommends an a3 factor of .456 for “slip fit” ballbearings.*Shock and Vibration* — Vibration and shock loading can act as anadditional loading to the steady expected applied load. When shockor vibration is present, the following a3, Life Adjustment Factors arerecommended. The shock factor is used in combination with the “slipfit” factor.Table No. 2Ball Bearing Life Calculation3a3 Life Adjustment Factor for Operating Conditions.This factor should take into account the adequacy of lubricant, presenceof foreign matter, conditions causing changes in material properties,and unusual loading or mounting conditions. Assuming a properlyselected bearing having adequate seals and lubricant operating below250 F and tight fitted to the shaft, the a3 factor should be 1.0.16667xnWhere:L10 The number of hours that 90% of a group of identical bearingsunder ideal conditions will operate at a specific speed and load conditionbefore fatigue failure is expected to occur.C The Basic Dynamic Load Rating in Lbs.Shock/Vibration FactorSteady LoadingLight Shock/VibrationModerate Shock/Vibration18.104.22.168The a3 factor takes into account a wide range of application andmounting conditions as well as bearing features and design. Accuratedetermination of this factor is normally achieved through testing andin-field experience. Sealmaster offers a wide range of options whichcan maximize bearing performance. Consult SEALMASTERApplication Engineering for more information. *See samplecalculations on page 184.SelectionSelect an initial bearing size and calculate the expected L10 life. Ifthe life is not acceptable, select another bearing size as appropriateand recalculate the Lna life. Continue this iterative process until anappropriate Lna life is obtained.P The equivalent Radial Load in Lbs.n Shaft speed in RPM.Combined Load CalculationAdditionally, the ABMA provides application factors for Ball Bearingswhich need to be considered to determine an adjusted Rated Life (Lna).Lna a1 x a2 x a3 x L10- For applications with only a radial load present P FrWhere Fr Applied radial load in pounds.Where:Lna Adjusted Rated Life.a1 Reliability Factor.Adjustment factor applied where estimated fatigue life is based onreliability other than 90% (See Table No 1).Table No. 1Life Adjustment Factor for ReliabilityREALIABILITY .330.215a2 Material Factor.Life adjustment for Bearing race material. All SEALMASTER Ball bearingraces are manufactured from 52100 Vacuum Degassed Bearing steel.Therefore the a2 factor is 1.0 for all SEALMASTER Ball Bearings. It isimportant to check with all manufacturers to ensure that properadjustments are made when other bearing steels are used.178For applications where combined radial and thrust loads are presentthe equivalent radial load (P) must be calculated before applying theL10 life formula.- For applications with only a thrust load presentContact SEALMASTER Application Engineering.Calculate (P) equivalent radial Load.1. Use Table 4 to identify the relative axial load factor (ND2).2. Determine the relative axial load (RAL):RAL FaND-applied thrust load2-relative axial load factor3. Match the nearest relative axial load value in Table #3 to thecorresponding “e” value. For precise calculation, linearly interpolatethe values for “e” for your exact relative axial load value.4. Calculate Fa/Fr and compare value to the “e” value found in step#3 above.5. Choose values for “X” and “Y” based on step #3 & 4 and fromTable No. 3. Linear interpolation is recommended for exactcalculations.6. Calculate equivalent radial load using the following equation:P XFr YFa7. Calculate the adjusted life (Lna) using the life calculation formulaabove.Refer to Page 182 for Relevant Disclaimer.
BALL BEARING RATING & SELECTIONExplanation of Rating Selection:1. For standard and medium duty spherical outerrace inserts as well as “AR” bearings, match thebearing insert number to the insert number onthe ratings chart (i.e. 2-15, AR-2-15, 2-15D, and2-15T all use 2-15 insert rating.)Ball Bearing Selection New Applications:Using variations of the life formulasand application information, it ispossible to select bearings basedon desired life, load applied, andshaft speed. This method can beapplied where axial load is lessthan or equal to 1/2 the radialload.1. Determine required applicationhours (Lna).2. Calculate L10 using adjustmentfactors:LL10 a x ana x af233. Calculate Basic Dynamic RadialRating (Creq).Creq P x(L10 x N16,667)1/34. Use Table No. 4, find a basicDynamic Radial Rating Valuegreater than or equal to Creqcalculated in step # 3.5. Select any bearing from the rowin step # 4 or larger. If Creq isgreater than the largest BasicDynamic Radial Rating Value ofTable No. 4, go to Roller BearingSelection on page 182.6. If Ball bearing is selected,proceed with housing, seal, lockselection pages 187-191.Typical operating temperaturerange for standard bearings is -20 to 200 F. For operatingtemperatures outside this rangecontact application engineering.For Maximum speed information,see tables on pages 180 and 181.Table No. 3Equivalent Load CalculationData - Ball 10300.15500.25749.65999.05eFa/Fr ex0.190.220.260.280.300.340.380.420.441y0Fa/Fr exy2.301.991.711.550.56 1.451.311.151.041.00Table No. 4MEDIUM DUTYINSERT #ER 2-342-362-372-385218Contact SEALMASTER Engineering for additionaldetails.Load Ratings - Ball BearingsSTANDARD mm11 1/161 1/830mm1 3/161 1/41 1/41 5/161 3/835mm1 7/161 1/21 9/1640mm1 5/81 11/161 3/445mm1 13/161 7/81 15/1650mm222 1/855mm2 3/162 1/42 5/1660mm2 3/82 7/162 1/22 11/1670mm2 7/82 15/1675mm380mm3 3/163 1/43 3/83 7/163 1/290mm3 15/1642. For “ER’, “RB” and “TXP” inserts, match bearinginsert number to “ER” number (i.e. ER-23 &TXP 23 both use an ER-23 insert R-52ER-54ER-55ER-63ER-64SHAFTSIZEINSERT #THRUSTRATING1444RELATIVEAXIALLOADFACTORND 5671.2996117730mm1 3/1653063-13578234931.7424170935mm1 7/1653073-17734044672.250022541 1/240mm3-185308790151392.500023501 11/161 3/445mm3-1113-1125309788952162.500023501 15/1650mm3-1155310975266013.3160288655mm2 3/1653113-231178981503.969041052 7/162 1/265mm2 14839112245.237152072 15/1675mm380mm3 44966.692474743 7/163-3721566163017.74407839100mm3 15/1644 7/164 4823326715.625016697179
BALL BEARING RATING TABLESGOLDLINE BALL BEARING RATING TABLESThis chart displays the Goldline Ball Bearing load capacities for a given L10 life, speed, and shaft size. The shaded area indicates themaximum speed ratings for SKWEZLOC and double lock bearings (applicable on sizes available). All speeds listed are for the standard feltseal. See Seal Selection for alternate seals, pages 188-189.Values in the table represent loads at ideal conditions with press fit mounting to the shaft. ABMA recommends de-rating of slip fit mountedbearings. To obtain de-rated load, divide the load in the table by 1.3. Values in the table represent equivalent radial loads only. For combinedload determination, see page 178. Areas designated by “-” exceed maximum value for standard bearings. Consult SEALMASTER ApplicationEngineering for load and speed applications not covered in this table.Double Lock and SKWEZLOC use same bearing insert ratings as single lock inserts shown below.For RB, TX, and ETX inserts use standard duty load ratings for the appropriate shaft size.Table No. 5STANDARD DUTYLoad Ratings - Ball BearingsMEDIUM DUTYSHAFT INSERTSHAFT INSERT L10ER 0005/82-010 ER-105000011/16 2-011 ER-111000003/42-012 ER-1220mm 5204 ER-204500013/16 2-013100002-014 ER-147/83000015/16 2-015 ER-155000025mm 5205 ER-20510000012-1ER-161 1/16 2-11 ER-17 15/16 3-015 50001000013-1ER-181 1/82-12ER-19 25mm 5305 300001 3/16 2-135000030mm 5206 ER-2061000001 1/4R 1-145000ER-20 30mm 53062-141 1/410000ER-21 1 3/16 3-131 5/16 2-15300002-16ER-221 3/85000035mm 5207 ER-2071000001 7/16 2-17ER-235000100001 1/22-18ER-24 1 7/16 3-171 9/16 2-19ER-25 35mm 5307 300005000040mm 5208 ER-20810000050001 5/8 2-110 ER-26 1 1/23-181 11/16 2-111 ER-27 45mm 5308 10000300001 3/4 2-112 ER-285000045mm 5209 ER-2091000001 13/16 2-1131 11/16 3-111 50001 7/8 2-114 ER-30 1 3/4 3-112 100001 15/16 2-115 ER-31 45mm 5309 300005000050mm 5210 ER-2101000001-2500022-2ER-321 15/16 3-115100002 1/82-22ER-3450mm 53103000055mm 5211 ER-211500002 3/162-23ER-35100000REVOLUTIONS PER MINUTE501505001000 1750 2000 2500 3500 4500 5000 5500 6000 6500 7500 8000 852676418 347 332 308 276332 276 264 245 219230 191 183 170 152194 161 154 143 128154 128 122 114 102654 543 519 482 431519 431 412 383 342360 299 286 265 237304 252 241 224 200241 200 191 178 159864 717 686 636 569686 569 544 505 452475 394 377 350 313401 333 318 295 264318 264 253 234 2101096 910 870 808 722870 722 691 641 573603 501 479 445 397509 422 404 375 335404 335 321 298 2661180 979 937 870 777937 777 744 690 617650 539 516 479 428548 455 435 404361435 361 345 320 2861178 978 935 868 776935 776 742 689 616649 538 515 478 427547 454 434 403 360434 360 345 320 2861457 1209 1156 1073 10101156 959 918 852 802802 665 636 591 556676 561 537 498 469537 445 426 395 690548380320254689547379320254-Notes:1.For high load-high speed applications, see engineering section, page 204.2.180Typical operating temperature range for standard bearings is -20 to 200 F. For operating temperatures outside this range contact applicationengineering.
BALL BEARING RATING TABLESGOLDLINE BALL BEARING RATING TABLESThis chart displays the Goldline Ball Bearing load capacities for a given L10 life, speed, and shaft size. The shaded area indicates themaximum speed ratings for SKWEZLOC and double lock bearings (applicable on sizes available). All speeds listed are for the standard feltseal. See Seal Selection for alternate seals, pages 188-189.Values in the table represent loads at ideal conditions with press fit mounting to the shaft. ABMA recommends de-rating of slip fit mountedbearings. To obtain de-rated load, divide the load in the table by 1.3. Values in the table represent equivalent radial loads only. For combinedload determination, see page 178. Areas designated by “-” exceed maximum value for standard bearings. Consult SEALMASTER ApplicationEngineering for load and speed applications not covered in this table.Double Lock and SKWEZLOC use same bearing insert ratings as single lock inserts shown below.For RB, TX, and ETX inserts use standard duty load ratings for the appropriate shaft size.Table No. 5 (Continued) Load Ratings - Ball BearingsSTANDARD DUTYSHAFT INSERTER #SIZE#2 1/42-24ER-362 5/162-2560mm 5212 ER-2122 3/82-26ER-382 7/162-27ER-392 1/2ER-402 11/16 2-211 ER-4370mm 5214 ER-2142 7/82-214 ER-462 15/16 2-215 ER-4775mm 5215 ER-215380mm3 3/1652162-33ER-48ER-216ER-513 1/43 3/83 7/162-342-362-37ER-52ER-54ER-553 1/290mm2-385218-3 15/164ER-63ER-64----MEDIUM DUTYSHAFT INSERT L10SIZE#HOURS500055mm 5311100002 3/16 3-23300005000010000050002 7/16 3-27100002 1/23-2865mm 5313 300005000010000023-211 500011/16 5314 100003000070mm5000010000050003-215215/16 5315 100003000075mm3-3500003100000500080mm 5316100003 3/16 3-33300005000010000050003 7/16 3-371000030000500001000005000100mm 53203 15/16 3-315 100003000043-45000010000050004 7/16 3-4743-415 100003000015/1650000100000REVOLUTIONS PER 60247815381220846714567163312968997586023000 3500 4000 45001221 1160 1109969921 881672638611567538 515450427 4091447 13751149 10917567966726385065331537 14601220 11598468036787135665381916 18031521 14311055 9928908376647062056 19351632 15361132 106595489875771323741884130611028743707 35462942 28142040 19511721 16461366 13064891 4646 44443882 3688 35272692 2557 24462270 2157 20631802 1712 1637-Notes:1.For high load-high speed applications, see engineering section, page 204.2.Typical operating temperature range for standard bearings is -20 to 200 F. For operating temperatures outside this range contact applicationengineering.181
ROLLER BEARING RATING & SELECTIONThis section outlines the formula used to select bearing size or calculateexpected bearing life for RPB type Tapered Roller Bearings.Tapered Roller Bearings are excellent for applications where radial and/or thrust load ratings exceed the capabilities of a Ball Bearing. Note:Maximum speeds are lower for Tapered Roller Bearings than BallBearings.Combined Load CalculationFor applications where combined radial and thrust loads are presentthe equivalent radial load (P) must be calculated before applying theL10 life formula.For applications with only a radial load present P FrWhere Fr Applied radial load i