linear ball bearings ntn type applied shaft diameter mm composition of nominal number kd kd 20 32 45 ll this type composed of an outer ring steel balls and a cage is a cylindrical bearing for the most universal applications which ensures precise and smooth infinite linear motion due to its outer ring of high rigidity tail code shaft diameter 10 80 width outer diameter inscribed circle diameter type code ff ff zw this type composed of a cage and needle rollers ensures smooth reciprocating motion of less friction actor by being inserted between two planes in relative position the cage made of polyamide resin is provided with grooved joint at its both ends so several cages can be jointed together into one unit ff 25 18 zw tail code roller diameter 2 3.5 width roller diameter 10 type code bf rf this type composed of a cage and needle rollers ensures smooth reciprocating motion of less friction factor by being inserted between two planes in relative position press-formed steel plate cage bf
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linear ball bearings solid and drawn cup types ntn linear ball bearings solid and drawn cup types four to nine rows of balls are configured equally in the outer ring outer cylinder the ball rows circulate in axial direction while being guided by the cage thus these bearing types move infinitely on a shaft in axial direction however these bearing types can t rotate shaft and housing requirements any shaft /housing on/in which these bearing types are fitted must meet the requirements specified in table 2 table 2 shaft and housing requirements ball row outer ring characteristics roundness max cylindricality max surface roughness max surface hardness hardened layer depth min shaft it3 it2 0.4a hrc58 64 0.4mm housing it4 it4 1.6a cage fig 1 how to mount the housing for type klm solid type can t be fixed perfectly with interference only and therefore must be fixed in axial direction using a snap ring on the other hand type kh drawn cup type needs no axial fixing by a snap ring because it i
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solid type linear ball bearings type klm type klm s type klm p type klm ll type klm sll type klm pll ntn with seal fw 3 35mm boundary dimensions mm fw d c 0 0.010 0 0.010 0 0.010 0 0.010 0 0.010 0 0.010 0 0.012 0 0.012 0 0.012 basic load ratings dynamic static dynamic static n kgf d1 g h cr cor cr cor bearing numbers number mass of ball kg rows approx c1 0.240 0 0.120 0 0.120 0 0.120 0 0.120 0 0.120 0 0.120 0 0.120 0 0.120 0 0.120 c2 3 4 5 6 8 10 12 13 0 0.008 0 0.008 0 0.009 0 0.009 0 0.009 0 0.009 0 0.009 0 0.009 7 8 10 12 15 15 19 22 23 28 10 12 15 19 17 24 29 32 32 37 51 71 118 13.3 11.3 17.3 21.7 22.7 22.7 26.5 1.1 1.1 1.1 1.3 1.3 1.3 1.6 1.6 1.6 1.6 1.6 1.6 1.85 1.85 1.85 1.85 1.85 1.85 2.2 2.2 2.2 11.5 14.3 14.3 18 21 22 27 27 27 30.5 30.5 30.5 38 38 38 43 43 43 49 49 49 1.2 15.1 50° 0.6 13.0 50° 0.6 10.8 50° 0.6 8.6 50° 0.6 8.2 60° 130 116 234 435 480 540 875 875 875 1 190 1 190 1 190 40 52 90 107 94 187 297 380 455 670 670 670 985 985 985 5 7 12 13 12 24 45 49 55 89 89 89 121
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machined cup linear ball bearings type kh type kh ll ntn with seal fw 6 50mm boundary dimensions mm fw d c a1 cr bearing numbers dynamic basic load ratings static dynamic n kgf cor cr static number of ball rows mass kg cor approx 6 8 10 12 14 16 12 15 17 19 19 21 24 24 28 28 35 35 40 40 52 62 22 24 26 28 28 28 30 30 30 30 40 40 50 50 60 70 4 5 5 6 6 6 7 7 7 7 8 8 8 8 9 9 kh0622 kh0824 kh1026 kh1228 kh1228ll kh1428 kh1630 kh1630ll kh2030 kh2030ll kh2540 kh2540ll kh3050 kh3050ll kh4060 kh5070 380 420 480 605 605 600 775 775 1 050 1 050 1 930 1 930 2 700 2 700 4 250 5 300 225 255 325 495 495 505 600 600 880 880 1 560 1 560 2 450 2 450 4 000 5 700 39 43 49 62 62 61 79 79 107 107 197 197 275 275 435 540 23 26 33 51 51 51 61 61 90 90 159 159 250 250 410 580 4 4 4 5 5 5 5 5 6 6 6 6 7 7 8 9 0.007 0.012 0.015 0.018 0.018 0.021 0.027 0.027 0.033 0.033 0.066 0.066 0.095 0.095 0.18 0.24 20 25 30 40 50 note 1 showing a-value from the side face with stamped mark thereon 2 imported product from ina
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linear ball bearings stroke type ntn linear ball bearings stroke type the bearing cage with multiple ball rows several balls per row configured circumferentially therein can move within the outer ring in both circumferential and axial directions thus this bearing type can rotate and reciprocate but at a limited stroke on a shaft shaft and housing requirements table 3 specifies the requirements for shaft and housing which of the outer surfaces are used as the direct raceway table 3 shaft and housing requirements characteristics roundness max cylindricality max surface roughness max surface hardness hardened layer depth min shaft it2 it2 0.2a hrc58 64 0.4mm housing it4 it4 1.6a bearing construction maximum available length of the reciprocal stroke is two times as long as the stroke at which the cage can reciprocate within the outer ring the outer ring is provided at its both ends with a snap ring acting as a stopper and a wave spring is provided between the snap ring and the cage to damp
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machined ring linear ball bearings type kd type kd ll ntn type kd open type type kd ll with seal fw 10 80mm boundary dimensions mm type kd type kd ll t t d1 c1 max c1 max stroke stroke bearing numbers basic load ratings dynamic static dynamic static n kgf ll cr cor cr cor mass approx fw d f6 h5 c1 type kd type kd type kd kg type kd ll 10 19 12 23 16 28 20 32 25 37 30 45 35 52 40 60 45 65 30 32 37 45 45 65 70 80 80 1.7 1.7 1.7 2.2 2.2 2.7 2.7 2.7 2.7 3.2 3.2 3.2 3.2 3.2 0.4 0.4 0.5 0.5 0.6 0.7 0.7 0.7 0.7 1 1 1 1 1.2 1.5 1.5 1.5 2 2 2.5 2.5 2.5 2.5 3 3 3 3 3 22.7 24.5 29.1 35.8 35.8 53.5 58.5 68.3 68.3 86.4 86.4 86.4 86.4 86 27 30 33 55 55 81 90 103 103 136 136 136 136 129 15.5 17.1 21.1 26.8 26.8 45.1 50.1 59.9 59.9 77.4 77.4 77.4 77.4 77 19 22 26 46 46 73 79 93 93 125 125 122 122 116 kd101930 kd122332 kd162837 kd203245 kd253745 kd304565 kd355270 kd406080 kd456580 kd5072100 kd5580100 kd6085100 kd7095100 kd101930ll kd122332ll kd162837ll kd203245ll kd253745ll kd304565ll kd355270ll kd406
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machined ring linear ball bearings ntn b-247
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linear flat rollers ntn stopper fig 5 b-249
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linear flat rollers type ff type ff zw ntn dw 2 3.5mm boundary dimensions dynamic mm dw1 b b l lw a cr basic load ratings static dynamic static n kgf cor cr cor bearing numbers number of rolls abutment dimensions mm e h 0.1 0 0.1 0 0.1 0 0.1 0 0.1 0 0.1 0 0.1 0 0.1 0 mass kg approx 0 0.2 0 0.2 0 0.2 0 0.2 0 0.2 0 0.2 0 0.2 0 0.2 2 2 2.5 2.5 3 3 3.5 3.5 10 10 15 15 20 20 25 25 55 45 35 25 32 32 45 45 60 60 75 75 6.8 6.8 9.8 9.8 13.8 13.8 17.8 17.8 2 2 2.4 2.4 3 3 3.2 3.2 8 500 15 500 17 100 29 300 31 000 53 500 50 000 86 000 19 700 39 500 41 400 82 500 79 500 145 000 132 000 265 000 865 1 580 1 740 2 980 3 150 5 450 5 100 8 800 2 010 4 000 4 200 8 450 8 100 14 800 13 500 27 000 ff2010 ff2025zw ff2515 ff2535zw ff3020 ff3045zw ff3525 ff3555zw 7 14 8 16 9 18 10 20 10.3 25.3 15.3 35.3 20.4 45.4 25.4 55.4 1.7 1.7 2.2 2.2 2.7 2.7 3.2 3.2 0.0020 0.0043 0.0038 0.0082 0.0089 0.019 0.017 0.035 note 1 the dimensional tolerance for needle roller diameter dw is 0 to -2 m b -250
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linear roller bearings ntn linear roller bearings this roller bearing with cylindrical rollers having the function capable of circulating within the raceway block ensures smooth infinite linear motion on a flat surface the cylindrical rollers are retained and guided by the cage and the ribs of the raceway block the cage is of such a construction as not allow adjacent rollers to contact with one another hence the friction coefficient is low requirements and tolerances for raceway surface and mounting surface table 2 shows the requirements and tolerances for the raceway surface on which linear roller bearing rolls and the bearing mounting surface where adhesion of a hard foreign matter to the raceway surface is forecast the raceway surface must be protected with a proper protective cover the reference surface for mounting is the back face and opposite face to ntn mark table 2 requirements for raceway surface and mounting surface characteristics raceway surface roughness max raceway surfa
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linear roller bearings type rlm ntn section z z h 16 38mm boundary dimensions mm h c l lw e f g lt e g k cr bearing numbers dynamic basic load ratings static dynamic static n kgf cor cr cor required case depth on track mass kg approx min mm 16 25 19 27 26 40 62 69 86 8 10 14 14 14 20 17 19 m4 35.5 12.5 6 3.2 3.2 4.5 4.5 4.5 6.5 rlm16 rlm19 rlm26 62 69 86 15 400 26 100 34 000 58 000 1 570 2 670 3 450 5 900 0.3 0.3 0.4 0.4 0.4 0.5 0.11 0.16 0.41 0.53 0.70 1.3 25.5 20.6 m4 43.4 15.5 6 28 44 68 51 30 30 30 41 m6 52.4 21 m6 67.9 21 m6 91.8 21 m8 85.7 31 10 10 10 14 50 000 106 000 62 500 142 000 80 000 195 000 5 100 10 800 6 400 14 500 8 150 19 900 26 40 102 26 40 126 38 52 134 rlm26 102 rlm26 126 rlm38 134 124 000 270 000 12 700 27 500 b-253
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