2 classifications and standard specifications of bearings for special environments table 1 summarizes the standard specifications of bearings for special environments for custom specifications please contact ntn engineering table 1 bearings for special environments classifications and standard specifications classification operating environment magnetic temperature atmosphere vacuum corrosives field 150°c bearing specification inner ring/outer ring martensite stainless steel mos2 coating martensite stainless steel pb coating martensite stainless steel ball martensite stainless steel mos2 coating martensite stainless steel pb coating martensite stainless steel ag coating martensite stainless steel martensite stainless steel special ptfe coating martensite stainless steel special ptfe coating special balls vacuum environments 300°c 400°c 70°c martensite stainless steel 200°c clean environments 260°c martensite stainless steel special ptfe coating 300°c 80°c contaminant-free envi
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3 performance and technical data of various bearings 3.1 vacuum bearings table 2 performance of vacuum bearings excellent allowable temperature range °c good fair not recommended bearing type mos2-coated bearings pb-coated bearings ag-coated bearings allowable vacuum range pa 10-5 1 10-5 10-5 load-carrying low-torque electrical capacity performance out particle outgassing conductivity 150 300 400 200 bearings with vacuum 10-5vapor pressure grease optional to atmospheric note ratings represent relative performance among vacuum bearings test data results of durability evaluation figures 2 through 6 provide sample evaluations of coating-dependent durability 10 9 mos2 sp tested bearing internal rotor external rotor cage ptfe resin heater pb ip total number of revolutions under load rev 10 8 tested bearing loading spring 10 7 ag ip ultra-clean fig 2 durability tester for high-vacuum bearing 10 6 mos2 sp ¡test conditions bearing axial load speed degree of vacuum temperature evaluation criter
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¡test conditions frictional torque 10-1n mm bearing axial load speed degree of vacuum temperature angular contact ball bearings full complement type 10n 2 500min-1 around 10-5 pa room temperature 10 22 7 100 80 60 40 20 0 106 107 108 total number of revolutions rev 1 5 10 life h 50 100 500 fig 4 evaluation of durability of ag ip bearing ¡test conditions frictional torque 10-1n mm bearing axial load speed degree of vacuum temperature angular contact ball bearings cage leaded copper alloy 10n 7 500min-1 around 10-5 pa room temperature 10 22 7 100 80 60 40 20 0 106 107 108 109 total number of revolutions rev 5 10 50 100 life h 500 1000 fig 5 evaluation of durability of pb ip bearing ¡test conditions frictional torque 10-1n mm bearing axial load speed degree of vacuum temperature angular contact ball bearings cage ptfe resin 10n 7 500min-1 around 10-5 pa room temperature 10 22 7 100 80 60 40 20 10 106 107 108 109 total number of revolutions rev 10 50 100 life h 500 1000 5000 fig 6 evaluat
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¡test conditions bearing deep groove ball bearings axial load 10n speed 50min-1 minimum particle size measured 0.38 µm degree of vacuum around 10-5 pa 8 22 7 ¡test conditions bearing deep groove ball bearings axial load 10n minimum particle size measured 0.1 µm temperature room temperature 8 22 7 company a ntn ultraclean bearings clean bearings company b ntn bearings clean grease with low out bearings particle grease 150 1500min 1 room temperature 150 5000min 1500min 1 1 room temperature 0 100 200 300 400 500 5000min 1 0 10000 20000 30000 40000 relative number of particles pieces/400 h number of particles pieces/30 min fig 9 measurement of out particle by ultra-clean bearing in vacuum fig 10 measurement of out particles by bearing with low out particle grease at atmospheric pressure ¡test conditions ntn bearings with low out particle grease for vacuum environment e company d company c company bearings with general fluorine grease 0 2000 4000 6000 8000 bearing deep groove ball bearings
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3.2.2 results of durability evaluation figures 14 through 16 provide evaluations of bearing durability ¡test conditions bearing axial load speed degree of vacuum temperature deep groove ball bearings 10n 360min-1 around 10-5 pa room temperature 8 22 7 ¡test conditions bearing axial load radial load speed temperature deep groove ball bearings 67n 67n 10000min-1 100°c 20 47 14 company a clean bearings b company ntn bearings clean grease with low out bearings particle grease ntn ultra-clean bearings 0 500 1000 1500 2000 2500 0 500 1000 1500 2000 time h time h fig 14 evaluation of durability of ultra-clean bearing fig 16 evaluation of durability of bearing with low out particle grease ¡test conditions long life ultraclean bearings atmosphere vacuum deep groove ball bearings 8 22 7 axial load 10n speed 2500min-1 atmospheric pressure/vacuum around 10-5 pa room temperature bearing ultra-clean bearings atmosphere 300°c vacuum 0 500 1000 1500 2000 time h fig 15 evaluation of durability of long-
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3.3 bearings for corrosive environments table 4 performance of bearings for corrosive environments applicable temperature range °c pps resin room temperature rolling bearing to 150°c load-carrying capability yes 10 hydrochloric acid 35 sulfuric acid 35 nitric acid 10 acetic acid 10 potassium hydroxide 10 sodium hydroxide 30 aqueous ammonia table 5 corrosion resistance of bearings for corrosive environments good fair not recommended inner ring outer ring pps resin cage ptfe resin rolling elements ceramic glass polyimide polyamide resin resin optional optional 3.4 electrically conductive bearings ¡test conditions bearing speed deep groove ball bearings 150min-1 140 120 k 100 resistance value 80 60 40 20 0 0 100 200 time h 300 400 500 electrically conductive grease ep-2 electrically conductive normal grease 30 42 7 speed temperature 50n room temperature fig 19 durability with electrically conductive grease ep-2 4 material characteristics table 6 comparison of characteristics of ceramic s
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5 applications table 7 summarizes typical applications of ntn bearings designed for extreme environments table 7 typical applications of bearings for extreme environments for vacuum environments equipment machine/device application vacuum grease ag coating pb coating mos2 coating for clean environments ultraclean long-life low out ultra-clean particle grease low out particle vacuum grease for corrosive environments pps resin manipulators aerospace geosynchronous satellites artificial satellites vacuum vacuum pumps actuators control mechanisms antenna deployment mechanisms main shafts stepper motors for vacuum environments main shafts electron beam drawing equipment guide rollers cvd systems sputtering systems transfer mechanisms transfer mechanisms rotary mechanisms transfer mechanisms rotating shafts valve actuator mechanisms transfer/rotary mechanisms rotary mechanisms transfer mechanisms guide rollers semiconductor fabrication evaporation systems etching systems cleaning equipment l
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6.2 ultra-clean bearings b r boundary dimensions mm bearing numbers d 8 9 10 12 13 10 13 14 16 12 15 17 19 17 19 22 19 22 24 22.225 22 26 30 35 24 28 32 28 32 35 30 35 40 37 42 47 42 47 52 47 55 62 d b 2 2.5 3 4 5 3 4 5 5 3 5 6 6 5 6 7 6 7 8 rs min1 allowable radial load 3 n kgf 0.10 0.16 0.16 0.26 0.35 0.17 0.27 0.36 0.41 0.18 0.38 0.62 1.34 0.40 1.06 1.72 0.54 1.72 2.53 1.68 1.37 2.45 2.84 5.67 1.44 2.84 3.82 1.82 3.18 4.98 2.53 3.79 6.35 3.70 4.90 7.87 4.90 6.45 10.10 5.25 10.56 13.20 1 1.6 1.6 2.5 3.4 1.7 2.6 3.5 4 1.8 3.7 6.1 13.1 3.9 10.4 16.9 5.3 16.9 24.8 16.5 13.4 24 27.8 55.6 14.1 27.8 37.4 17.8 31.2 48.8 24.8 37.1 62.2 36.3 48 77.1 48 63.2 99 51.5 103.5 129.4 basic load ratings dynamic5 n 305 490 500 745 1 010 550 830 1 020 1 350 640 1 040 1 690 1 800 1 240 1 720 2 570 1 530 2 570 3 050 2 560 2 070 3 500 3 950 6 300 2 220 3 950 4 700 2 810 4 300 5 950 3 600 5 250 7 400 4 900 7 200 9 900 5 400 7 750 10 800 5 550 10 200 15 000 static n 140 224 235 360 490 276 430 505 680 365 5
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6 dimensions 6.3 long life ultra-clean bearings b r boundary dimensions mm bearing numbers d d 19 22 22 24 26 30 35 28 32 28 32 35 30 35 40 37 42 47 42 47 52 47 55 b 6 7 7 8 8 9 11 8 10 7 9 11 7 10 12 9 12 14 9 12 15 9 13 rs min1 basic load ratings allowable radial load 2 dynamic3 static n kgf 1.34 1.72 1.72 2.53 2.45 2.84 5.67 2.84 3.82 1.77 3.18 4.98 2.29 3.79 6.35 3.26 4.90 7.87 4.35 5.51 10.01 4.75 9.20 n 1 800 2 570 2 570 3 050 3 500 3 950 6 300 3 950 4 700 2 810 4 300 5 950 3 600 5 250 7 400 4 900 7 200 9 900 5 400 7 750 10 800 5 550 10 200 n 885 1 400 1 400 1 590 1 960 2 390 3 500 2 390 2 750 2 000 2 830 3 600 2 580 3 350 4 600 3 700 5 050 6 650 4 550 5 850 7 850 5 000 8 300 r d d 6 7 8 10 12 0.3 0.3 0.3 0.3 0.3 0.6 0.6 0.3 0.6 0.3 0.3 0.6 0.3 0.3 0.6 0.3 0.6 1.0 0.3 0.6 1.0 0.3 1.0 mt2-5pt-seb26j1zz1c3/0g mt2-5pt-seb27j1zz1c3/0g mt2-5pt-seb08j1zz1c3/0g mt2-5pt-seb28j1zz1c3/0g mt2-5pt-seb000j1zz1c3/0g mt2-5pt-seb200j1zz1c3/0g mt2-5pt-seb300j1zz1c3/0g mt2-5pt-seb001j1zz1c3/0g mt2
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6 dimensions 6.5 bearings with low out particle grease for vacuum environment b r d boundary dimensions mm bearing numbers d 12 13 13 14 16 12 15 17 19 17 19 22 19 22 24 22.225 22 26 30 35 24 28 32 28 32 35 30 35 40 37 42 47 42 47 52 4 5 4 5 5 4 5 6 6 5 6 7 6 7 8 7.142 6 8 9 11 6 8 10 7 9 11 7 10 12 9 12 14 9 12 15 b rs min1 basic load ratings dynamic2 static n n 360 490 430 505 680 365 530 865 885 715 910 1 400 865 1 400 1 590 1 400 1 270 1 960 2 390 3 500 1 460 2 390 2 750 2 000 2 830 3 600 2 580 3 350 4 600 3 700 5 050 6 650 4 550 5 850 7 850 5 000 8 300 11 300 4 r 5 d d 6 0.2 0.2 0.2 0.2 0.3 0.15 0.2 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.6 0.6 0.3 0.3 0.6 0.3 0.3 0.6 0.3 0.3 0.6 0.3 0.6 1.0 0.3 0.6 1.0 f-604zz1c3/lx23q8 seb24j1zz1c3/lx23q12 seb95aj1zz1c3/lx23q20 f-605zz1c3/lx23q8 seb25j1zz1c3/lx23q24 f-wbc6-12zz1c3/lx23q7 seb96j1zz1c3/lx23q30 seb06j1zz1c3/lx23q15 seb26j1zz1c3/lx23q31 seb97j1zz1c3/lx23q6 seb07j1zz1c3/lx23q24 seb27j1zz1c3/lx23q19 seb98j1zz1c3/lx23q22 seb08j1z
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handling precautions 1 bearing components have been thoroughly degreased do not touch any bearing component with bare hands doing so may cause rusting of the bearing always wear clean lint-free gloves when installing a bearing 2 do not rinse a bearing with an organic solvent doing so may lead to lubricant leakage or damage to the lubricant film 3 do not unpack a vacuum-packed or heat-packed bearing until immediately before installation otherwise the bearing may rust or become contaminated with dust if the bearing will not be used for an extended period store it in a dry closed container such as a desiccator 18
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