warranty ntn warrants to the original purchaser only that the delivered product which is the subject of this sale a will conform to drawings and specifications mutually established in writing as applicable to the contract and b be free from defects in material or fabrication the duration of this warranty is one year from date of delivery if the buyer discovers within this period a failure of the product to conform to drawings or specifications or a defect in material or fabrication it must promptly notify ntn in writing in no event shall such notification be received by ntn later than 13 months from the date of delivery within a reasonable time after such notification ntn will at its option a correct any failure of the product to conform to drawings specifications or any defect in material or workmanship with either replacement or repair of the product or b refund in part or in whole the purchase price such replacement and repair excluding charges for labor is at ntn s expense all warr
|
bearing fits ntn 6.5 interference calculation 1 load and required interference when radial load acts on a bearing the interference required to prevent a clearance between its inner ring and a steel solid shaft can be expressed in formulas 6.1 and 6.2 for fr 0.3 cor d b fr 0.25 d b fr where dt required effective interference for temperature difference m t difference between bearing temperature and ambient temperature °c d bearing bore diameter mm 3 fitting surface roughness and required interference the fitting surface is smoothed surface roughness is made less by bearing fits so that the interference reduces correspondingly the interference reduced value differs depending on the fitting surface roughness and generally the following reduction values must be prospected for ground shafts 1.0 to 2.5mm for lathe-turned shafts 5.0 to 7.0 mm 4 maximum interference bearing ring fitted with interference on a shaft or in a housing results in tensile stress or compressive stress over-interf
|
needle roller and cage assemblies ntn bc bc ew fw ew fw type kmj type kmj s type kj s fw 32 38mm boundary dimensions mm fw ew bc basic load ratings dynamic static dynamic static n kgf cr cor cr cor limiting speeds r/min grease oil approx bearing numbers mass kg 37 37 37 37 32 38 38 38 39 39 39 40 40 40 40 40 41 35 41 41 42 42 42 42 42 36 42 42 37 42 42 44 38 43 43 13 17 26 27 14 20 26 16 18 20 13 17 26 27 30 14 15 40 16 18 20 30 45 46 13 17 27 18 17 27 0.2 0.55 0.2 0.55 0.2 0.55 0.2 0.55 0.2 0.55 14 500 19 200 24 900 29 600 19 800 25 100 31 500 22 600 24 000 26 800 15 200 20 000 26 100 32 000 26 100 19 400 20 900 43 000 24 100 24 700 28 500 39 500 42 500 23 000 33 000 46 000 57 500 30 500 41 000 54 000 32 000 35 000 40 000 25 100 36 000 50 000 65 000 50 000 30 500 33 500 84 000 36 000 37 000 44 500 68 000 74 000 1 480 1 950 2 540 3 000 2 020 2 560 3 200 2 310 2 450 2 740 1 550 2 040 2 660 3 250 2 660 1 980 2 130 4 400 2 450 2 510 2 910 4 050 4 300 5 200 1 620 2 080 3 300 2 680 2 130 3
|
drawn cup needle roller bearings sealed type type hk l type hmk l type hk ll type hmk ll type bk l ntn type hk l type hmk l type hk ll type hmk ll opened end and single-side seal type opened end and double-side seal type fw 25 50mm boundary dimensions mm c1 0 0.2 basic load ratings dynamic static dynamic static n kgf c3 max cr cor cr cor fw d c2 0 0.2 limiting speeds r/min grease bearing numbers open end single seal open end double seal closed end single seal 25 33 33 35 37 37 18 23 21 26 20 15 800 21 800 17 300 23 600 13 000 2.7 18 100 24 200 31 000 27 500 14 000 2.7 19 700 20 200 36 000 38 500 15 100 2.7 21 100 23 100 41 000 2.7 21 600 33 000 31 500 48 000 21 000 31 500 27 600 32 500 19 500 30 000 34 500 47 000 38 000 22 800 35 000 26 200 54 500 61 000 26 000 40 000 32 500 67 500 43 000 53 000 63 000 82 500 1 610 2 220 1 760 2 410 1 320 1 850 2 470 3 150 2 800 1 430 2 000 2 060 3 650 3 900 1 540 2 150 2 350 4 150 2 210 3 350 3 200 4 900 2 140 3 200 2 820 3 350 1 990 3 050 3 500 4 800
|
machined-ring needle roller bearings inch series without inner ring type mr ntn fw 15.875 63.500mm boundary dimensions dynamic mm 25.4mm fw d +0.027 +0.016 n c rs min 1 cr basic load ratings static dynamic static kgf cor cr cor limiting speeds r/min grease oil approx 15.875 8 28.5751 8 28.5751 8 31.7501 4 31.7501 4 34.9251 8 34.9251 8 38.1001 2 38.1001 2 41.2751 8 41.2751 8 44.4501 4 44.4501 4 47.6251 8 47.6251 8 52.3882 16 52.3882 16 55.5622 16 55.5622 16 58.7382 16 58.7382 16 61.9122 16 65.0882 16 65.0882 16 76.2003 76.2003 82.5503 4 19.05 4 25.401 19.05 4 25.401 19.05 4 25.401 19.05 4 25.401 25.401 31.751 4 25.401 31.751 4 25.401 31.751 4 25.401 31.751 4 25.401 31.751 4 25.401 31.751 4 31.751 4 25.401 31.751 4 38.101 2 44.451 4 38.101 2 0.6 0.6 1 1 1 1 1 1 1 1 1 1 1 1 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 2 16 700 21 500 19 500 25 000 21 900 28 200 23 000 29 500 32 500 40 500 35 000 43 500 37 000 46 500 41 000 51 000 43 500 54 500 44 500 55
|
b-114
|
needle roller bearings with thrust cylindrical roller bearings ntn dynamic ca basic load ratings static dynamic static n kgf axial coa ca coa limiting dimensions r/min grease oil bearing numbers type nkxr type nkxr z abutment dimensions mm da ras min max mass approx kg type nkxr type nkxr z 12 900 13 400 20 200 27 300 27 800 31 000 43 000 45 500 48 000 28 600 31 000 46 500 68 000 72 500 87 000 121 000 135 000 150 000 1 310 1 370 2 060 2 780 2 840 3 150 4 350 4 650 4 900 2 920 3 150 4 700 6 900 7 400 8 900 12 400 13 800 15 300 2 800 2 500 2 100 1 800 1 500 1 400 1 200 1 100 1 000 11 000 10 000 8 500 7 000 6 000 5 500 4 800 4 400 4 000 nkxr15t2 nkxr17t2 nkxr20t2 nkxr25t2 nkxr30t2 nkxr35t2 nkxr40t2 nkxr45t2 nkxr50t2 nkxr15t2z nkxr17t2z nkxr20t2z nkxr25t2z nkxr30t2z nkxr35t2z nkxr40t2z nkxr45t2z nkxr50t2z 25 27 32 39 44 49 56 61 66 0.3 0.3 0.3 0.6 0.6 0.6 0.6 0.6 0.6 0.048 0.050 0.090 0.128 0.162 0.184 0.226 0.267 0.309 0.052 0.053 0.095 0.135 0.169 0.195 0.237 0.286 0.329 b-149
|
cam followers stud type truck rollers ntn h type kr ll sealed type with cage type krv full complement type type krv ll full complement type with seal type kr h with hexagonal wrench socket basic load ratings dynamicstatic dynamic static n kgf cr cor cr cor load ratings of truck n kgf limiting speeds r /min grease oil maximum tightening torque n m kgf m bearing numbers type nr 1 type krv spherical cylindrical spherical cylindrical outer ring outer ring outer ring outer ring mass stud approx diameter kg mm type nr ll1 type type type krv ll kr krv 1 640 2 500 2 170 3 500 2 650 4 500 4 050 6 500 4 750 1 270 2 610 1 690 3 800 2 260 5 350 4 200 9 350 5 400 168 255 221 360 270 455 415 665 480 130 267 172 385 231 545 560 560 725 725 805 805 1 360 1 360 1 790 1 790 2 220 2 220 3 400 3 400 4 050 4 050 5 150 5 150 6 100 6 100 7 700 7 700 8 200 8 200 57 57 74 74 82 82 110 110 141 141 172 172 216 216 267 267 291 291 139 139 183 183 226 226 350 350 415 415 525 525 620 620 785 785 835 835 27 000 25
|
thrust cylindrical roller bearing type 811 type 812 r ntn t dw r d d1 d d1 dc dc1 eb ea type 811 type 812 bearing type k811 type k812 thrust needle roller and cage assy d 140 160mm boundary dimensions dynamic d d d1 0.2 0.5 d1 0.5 0.2 mm t dc1 e11 basic load ratings static dynamic n kgf coa ca limiting speeds static r/min grease oil coa dc a13 dw 0 0.010 b h11 rs min1 ca 140 150 160 180 200 190 200 178 197 188 198 142 143 152 162 31 46 31 31 140 140 150 160 180 200 190 200 12 19 12 12 9.5 13.5 9.5 9.5 1 1.5 1 1 206 000 370 000 214 000 221 000 815 000 1 280 000 870 000 930 000 21 000 83 000 380 350 350 330 1 500 1 400 1 400 1 300 38 000 130 000 21 800 22 600 89 000 95 000 note 1 allowable minimum chamfer dimension r b-218
|
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
|
appendix ntn inch millimeter conversion table inch fraction 1/64 1/32 3/64 1/16 5/64 3/32 7/64 1 8 9/64 5/32 11/64 3/16 13/64 7/32 15/64 1 4 17/64 9/32 19/64 5/16 21/64 11/32 23/64 3 8 25/64 13/32 27/64 7/16 29/64 15/32 31/64 1 2 33/64 17/32 35/64 9/16 37/64 19/32 39/64 5 8 41/64 21/32 43/64 11/16 45/64 23/32 47/64 3 4 49/64 25/32 51/64 13/16 53/64 27/32 55/64 7 8 57/64 39/32 59/64 15/16 61/64 31/32 63/64 1in 25.4mm decimals 0.015625 0.031250 0.046875 0.062500 0.078125 0.093750 0.109375 0.125000 0.140625 0.156250 0.171875 0.187500 0.203125 0.218750 0.234375 0.250000 0.265625 0.281250 0.296875 0.312500 0.328125 0.343750 0.359375 0.375000 0.390625 0.406250 0.421875 0.437500 0.453125 0.468750 0.484375 0.500000 0.515625 0.531250 0.546875 0.562500 0.578125 0.593750 0.609375 0.625000 0.640625 0.656250 0.671875 0.687500 0.703125 0.718750 0.734375 0.750000 0.765625 0.781250 0.796875 0.812500 0.828125 0.843750 0.859375 0.875000 0.890625 0.906250 0.921875 0.937500 0.953125 0.968750 0.984375 0
|
