components needle rollers/snap rings/seals
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needle rollers ntn needle rollers ntn needle rollers are all made of high carbon chrome bearing steel fine-finished by grinding and polishing after heat-treated and the hardness thereof ranges from hrc60 to 65 these needle rollers are supplied as not only rolling element but also pin and shaft individuals needle roller tolerances any needle rollers are manufactured with dimensional accuracy and profile accuracy conforming to jis b 1506 rollers for roller bearings table 2 table 2 needle roller tolerances unit m end face profile of needle roller f-type needle roller bearing with flat end face is standard type while a-type with round end face is semistandard type in addition to these two types another needle roller type nominal number with tail code e capable of damping edge load is also available feel free to contact ntn for the detail thereof characteristics tolerance for mean value of diameter dw mutual deviation of diameter dw roundness of diameter dw variation in diameter tolerance
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needle rollers ntn application of needle rollers when composing a full-complement roller type needle roller bearing using standard needle rollers shaft diameter d housing hole diameter d circumferential clearance c and radial clearance r must be determined respectively these can be calculated as follows from needle roller diameter dw and number of rollers z refer to fig 2 determine the minimum value of circumferential clearance c using formula 1 and select radial clearance r according to applicable shaft diameter and operating conditions in reference to table 5.1 as the guideline of 5.1 bearing radial clearance page a30 in general full-complement roller type bearing needs radial clearance larger than that in needle roller and cage assembly type roller bearing c 0.005 0.020 z mm minimum value 1 the maximum value of housing bore diameter d required to retain needle rollers in a housing by a keystone can be determined from the minimum diameter value dw min of the roller and the num
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needle rollers type f type a ntn type f type a dw 1.5 4.5mm boundary dimensions mm dw lw bearing numbers mass kg flat type disk type per 1 000 pcs boundary dimensions mm dw lw bearing numbers mass kg flat type disk type per 1 000 pcs 5.8 6.8 1.5 7.8 9.8 11.8 13.8 6.8 7.8 9.8 2 11.8 13.8 15.8 17.8 19.8 7.8 9.8 11.8 13.8 2.5 15.8 17.8 19.8 21.8 23.8 9.8 11.8 13.8 3 15.8 17.8 19.8 21.8 f1.5 f1.5 f1.5 f1.5 f1.5 f1.5 f2 f2 f2 f2 f2 f2 f2 f2 f2.5 f2.5 f2.5 f2.5 f2.5 f2.5 f2.5 f2.5 f2.5 f3 f3 f3 f3 f3 f3 f3 5.8 6.8 7.8 9.8 11.8 13.8 6.8 7.8 9.8 11.8 13.8 15.8 17.8 19.8 7.8 9.8 11.8 13.8 15.8 17.8 19.8 21.8 23.8 9.8 11.8 13.8 15.8 17.8 19.8 21.8 a1.5 a1.5 a1.5 a1.5 5.8 6.8 7.8 9.8 0.080 0.090 0.104 0.131 0.159 0.186 0.158 0.183 0.232 0.281 0.330 0.379 0.428 0.477 0.284 0.351 0.438 0.514 0.591 0.668 0.745 0.821 0.898 0.556 0.671 0.784 0.897 1.01 1.12 1.23 4.5 4 3.5 3 23.8 25.8 27.8 11.8 13.8 15.8 17.8 19.8 21.8 23.8 25.8 29.8 31.8 34.8 13.8 15.8 17.8 19.8 21.8 23.8 25.8 27.8 29.8 31.8 34.8 37.8
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needle rollers ntn dw 4.5 5mm boundary dimensions mm dw lw bearing numbers mass kg flat type disk type per 1 000 pcs 23.8 25.8 29.8 4.5 31.8 34.8 37.8 39.8 44.8 19.8 21.8 23.8 25.8 5 29.8 31.8 34.8 37.8 39.8 49.8 f4.5 f4.5 f4.5 f4.5 f4.5 f4.5 f4.5 f4.5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 23.8 25.8 29.8 31.8 34.8 37.8 39.8 44.8 19.8 21.8 23.8 25.8 29.8 31.8 34.8 37.8 39.8 49.8 a4.5 a4.5 a4.5 a4.5 a4.5 a4.5 a4.5 a4.5 a5 a5 a5 a5 a5 a5 a5 a5 a5 a5 23.8 25.8 29.8 31.8 34.8 37.8 39.8 44.8 19.8 21.8 23.8 25.8 29.8 31.8 34.8 37.8 39.8 49.8 2.86 3.11 3.62 3.87 4.25 4.63 4.88 5.51 2.89 3.20 3.52 3.82 4.45 4.74 5.11 5.55 5.85 7.33 b-225
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snap rings ntn snap rings these snap rings are used exclusively for fixing or guiding a needle roller bearing ring or cage in axial direction furthermore these snap rings have the profile identical to c-type concentric snap ring specified in jis b 2806 and in addition snap rings with smaller section height b and also available in smaller dimension range are manufactured according to application of needle roller bearings these snap rings are manufactured using hard steel wire rod and after manufactured chemical conversion treatment is applied to the surface thereof composition of nominal number the snap ring nominal number is composed of type code wr or br and dimension code the dimension code represents applicable shaft diameter in type wr and applicable housing bore diameter in type br wr 38 dimension code type code fig 3 types of snap ring two types of snap ring are available one is type wr designed for application to shaft and another is type br for application to bearing housing al
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snap rings for shaft type wr ntn bearing numbers d1 boundary dimensions mm d3 max b s 0.06 limiting speeds r/min bearing numbers d1 boundary dimensions mm d3 max b s 0.06 limiting speeds r/min d2 d2 wr 4 wr 5 wr 6 wr 7 wr 8 wr 9 wr10 wr11 wr12 wr13 wr14 wr15 wr16 wr17 wr18 wr19 wr20 wr21 wr22 wr23 wr24 wr25 wr26 wr28 wr29 wr30 wr32 wr35 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 28 29 30 32 35 3.7 4.7 5.6 6.5 7.4 8.4 9.4 10.2 11.2 12.2 13.1 14 15 16 17 17.9 18.7 19.7 20.7 21.7 22.5 23.5 24.5 26.5 27.5 28.5 30.2 33.2 0.8 1 1.1 1.2 1.3 1.3 1.3 1.3 1.3 1.3 1.5 0.5 0.5 0.7 0.7 1 1 1 1 1 1 1.2 3.8 4.8 5.7 6.7 7.6 8.6 9.6 10.5 11.5 12.5 13.5 14.4 15.4 16.4 17.4 18.4 19.2 20.2 21.2 22.2 23 24 25 27 28 29 30.8 33.8 0 0.16 0 0.13 0 0.11 0 0.09 275 000 192 000 141 000 134 000 108 000 80 000 68 000 64 500 53 000 49 600 45 900 44 500 38 000 34 500 30 000 28 900 26 200 23 400 20 800 19 500 18 100 16 400 14 800 15 400 14 400 13 200 13 300 10 700 wr 37 wr 38 wr 40 wr 42 wr 43 wr 4
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snap rings for shaft type wr ntn bearing numbers d1 boundary dimensions mm d3 max b s 0.06 limiting speeds r/min bearing numbers d1 boundary dimensions mm d3 max b s 0.06 limiting speeds r/min d2 d2 wr105 wr110 wr115 wr120 wr125 wr130 wr135 wr140 wr145 wr150 wr155 wr160 wr165 wr170 wr175 wr180 wr185 wr190 wr195 wr200 wr210 wr220 wr225 wr230 wr240 wr250 wr260 wr265 105 110 115 120 125 130 135 140 145 150 155 160 165 170 175 180 185 190 195 200 210 220 225 230 240 250 260 265 101.7 106.7 111.7 116.7 121.7 126.7 131.6 136.6 141.6 146.6 151.6 156.6 161.6 166.6 171.6 175.6 180.6 185.6 190.6 195.6 205.6 215.6 220.6 225.6 235.6 245.6 253 258 3.4 3.4 3.4 3.4 3.4 3.4 4 4 4 4 4 4 4 4 4 5 5 5 5 5 5 5 5 5 5 5 7.5 7.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 3 3 3 3 3 3 3 3 3 3 3 4 4 102.7 107.7 112.7 117.7 122.7 127.7 132.4 137.4 142.4 147.4 152.4 157.4 162.4 167.4 172.4 177 182 187 192 197 207 217 222 227 237 247 255 260 0 0.32 0 0.29 0 0.25 0 0.22 1 390 1 240 1 100 1 000 920 8
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snap rings for housing type br ntn bearing numbers d1 boundary dimensions mm d3 min b s 0.06 bearing numbers d2 d1 boundary dimensions mm d3 min b s 0.06 d2 br 7 br 8 br 9 br10 br11 br12 br13 br14 br15 br16 br17 br18 br19 br20 br21 br22 br23 br24 br25 br26 br27 br28 br29 br30 br31 br32 br33 br34 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 7.5 8.5 9.5 10.6 11.6 12.7 13.8 14.8 15.8 16.8 17.8 18.9 19.9 21 22 23 24 25.2 26.2 27.2 28.2 29.2 30.2 31.4 32.4 33.4 34.4 35.4 1 1 1.1 1.2 1.3 1.3 1.3 1.3 1.3 1.6 1.6 1.75 1.75 1.75 1.75 1.75 1.75 1.75 1.75 1.75 1.75 1.75 1.75 2.3 2.3 2.3 2.3 2.3 0.8 0.8 0.8 0.8 1 1 1 1 1 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.5 1.5 1.5 1.5 1.5 7.3 8.3 9.3 10.4 11.4 12.4 13.5 14.5 15.5 16.5 17.5 18.5 19.6 20.6 21.6 22.6 23.6 24.8 25.8 26.8 27.8 28.8 29.8 31 32 33 34 35 0.16 0 0.13 0 0.11 0 0.09 0 br35 br36 br37 br38 br39 br40 br41 br42 br43 br44 br45 br46 br47 br48 br49 br50 br52 br53 br54 br55 br57 br58 br60 b
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snap rings for housing type br ntn bearing numbers d1 boundary dimensions mm d3 min b s 0.06 bearing numbers d2 d1 boundary dimensions mm d3 min b s 0.06 d2 br 66 br 68 br 70 br 72 br 73 br 74 br 75 br 76 br 77 br 78 br 79 br 81 br 82 br 83 br 85 br 86 br 88 br 90 br 92 br 93 br 95 br 97 br 98 br100 br102 br103 br105 br107 66 68 70 72 73 74 75 76 77 78 79 81 82 83 85 86 88 90 92 93 95 97 98 100 102 103 105 107 68.3 70.3 72.3 74.6 75.6 76.6 77.6 78.6 79.6 80.6 81.6 83.6 84.6 85.6 87.6 88.6 91 93 95 96 98 100 101 103 105.3 106.3 108.3 110.3 2.3 2.3 2.3 2.8 2.8 2.8 2.8 2.8 2.8 2.8 2.8 2.8 2.8 2.8 2.8 2.8 3.4 3.4 3.4 3.4 3.4 3.4 3.4 3.4 3.4 3.4 3.4 3.4 1.5 1.5 1.5 2 2 2 2 2 2 2 2 2 2 2 2 2 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 67.5 69.5 71.5 73.8 74.8 75.8 76.8 77.8 78.8 79.8 80.8 82.8 83.8 84.8 86.8 87.8 90 92 94 95 97 99 100 102 104.3 105.3 107.3 109.3 0.22 0 0.19 0 br108 br110 br112 br113 br115 br117 br118 br120 br123 br125 br127 br130 br133 br135 br137 br140 br143 br150 br153
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snap rings ntn bearing numbers d1 boundary dimensions mm d3 min b s 0.06 d2 br195 br200 br205 br210 br215 br220 br225 br230 br240 br250 br260 br270 br280 br300 br320 br325 br350 br355 br360 br375 br380 br385 br395 br400 br415 br420 br440 195 200 205 210 215 220 225 230 240 250 260 270 280 300 320 325 350 355 360 375 380 385 395 400 415 420 440 199.5 204.5 209.5 214.5 219.5 224.5 229.5 234.5 244.5 254.5 267 277 287 307 327 332 357 362 367 382 387 392 402 407 422 427 447 5 5 5 5 5 5 5 5 5 5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 3 3 3 3 3 3 3 3 3 3 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 198 203 208 213 218 223 228 233 243 253 265 275 285 305 325 330 355 360 365 380 385 390 400 405 420 425 445 0.40 0 0.36 0 0.32 0 0.29 0 b-231
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seals ntn seals seals these are the special-purposed seals for needle roller bearings whose cross sectional height is designed so small as to match applicable needle roller bearings these contact seals are made of synthetic rubber reinforced with steel plate being then used in operating temperature range of -25 to +120°c and under continuous running at 100°c and less further feel free to contact ntn for the use of these seals under special operating condition e.g operating temperature of over 120°c fitting relations the seal contact surface must be finished by grinding after hardened to get its good sealing performance in addition harmful flaw and indent are not allowed to exist on the seal contact surface where the inner ring raceway surface is used as seal contact surface a wide inner ring must be used when fitting a seal in a bearing it is desirable to taper the shaft end face or the housing end face so as to protect the seal lip and outer surface from damaging as illustrated in fig
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seals type g type gd ntn type g type gd bearing numbers boundary dimensions mm b d d1 +0.2 0 mass 10-3 kg g gd bearing numbers boundary dimensions mm b d d1 +0.2 0 mass 10-3 kg g gd type g type gd type g type gd g 4 g 5 g 5 g 6 g 6 g 7 g 7 g 8 g 8 g 9 g 9 g10 g10 g12 g12 g12 g13 g14 g14 g14 g15 8 2 9 2 10 2 10 2 12 2 11 2 14 2 12 3 15 3 13 3 16 3 14 3 17 3 16 3 18 3 19 3 19 3 20 3 gd14 21 3 gd14 22 3 gd14 21 3 gd15 20 3 21 3 22 3 21 3 23 3 22 3 24 3 25 3 23 3 25 3 24 3 4 5 5 6 6 7 7 8 8 9 9 10 10 12 12 12 13 14 14 14 15 15 16 16 16 17 17 18 8 9 10 10 12 11 14 12 15 13 16 14 17 16 18 19 19 20 21 22 21 23 22 24 25 23 25 24 0.119 0.035 0.098 0.028 0.081 0.023 2 0.18 2 0.19 2 0.22 2 0.21 2 0.38 2 0.25 2 0.52 3 0.41 3 0.74 3 0.44 3 0.69 3 0.50 3 0.87 3 0.56 3 0.86 3 0.94 3 0.87 3 0.96 0.99 3 1.1 3 1.3 3 1.0 3 1.3 3 1.3 3 1.3 3 1.6 3 1.3 3 1.5 3 1.2 1.1 1.2 1.0 1.3 1.1 1.3 1.6 1.1 1.4 1.2 g18 26 4 gd18 26 g19 27 4 gd19 4 18 19 20 20 21 22 22 24 25 25 25 26 28 28 29 29 30 30 32 32 35 35 37 38
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seals type g type gd ntn type g type gd bearing numbers boundary dimensions mm b d d1 +0.2 0 mass 10-3 kg g gd type g type gd g43 53 g45 g45 4 gd43 53 52 55 58 62 4 4 4 4 5 43 45 45 50 50 53 52 55 58 62 0.173 0.053 4 4 4 4 4.8 3.8 5.2 4.5 4.3 3.8 5.5 5.2 52 4 gd45 55 4 gd45 g50 58 4 gd50 g50 62 5 gd50 5 10.4 10 note 1 the outer diameter tolerance is the mean value of the measured values at two measuring points b-234
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