Double-Row. Type TNA

Tapered Roller Bearings

Double-Row. Type TNA

Tapered double outer (TDO) bearings, often designated as type TNA (Tapered Double Outer), are a type of double-row tapered roller bearing designed to accommodate both radial and axial loads in both directions. These bearings have two double cups on the outer part of the bearing and two single cones on the rotating shaft, separated by a spacer.

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Parameter

part Number		Bearing Dimensions				Load Ratings	Bearing weight
Inner	outer					Load Ratings
					Double
		Bore d	0.D. D	width T	0uter Ring width C
						Dynamic（1)

		mm in.	mm in.	mm in.	mm in.	N lbf	kg lbs.
NA05075	05185D	19.050 47.000 31.750 25.212				46500	0.23 0.51
		0.7500 1.8504 1.2500 0.9926				10500
NA17098	17245D	24.981 62.000 39.688 36.258				75300	0.62 1.36
NA17098	17245D	0.9835 2.4409 1.5625 1.4275				16900	0.62 1.36
NA41125	41294D	28.575 74.612 55.565 41.275				121000	1.12 2.45
		1.1250 2.9375 2.1876 1.6250				27300
NA26118	26284D	29.987 71.973 42.760 36.512				102000	0.84 1.87
		1.1806 2.8336 1.6835 1.4375				23000
NA08125	08231D	31.750 58.738 32.542 24.608				55200	0.35 0.79
		1.2500 2.3125 1.2812 0.9688				12400
NA43131	43319D	33.337 80.962 55.562 39.688				135000	1.28 2.82
		1.3125 3.1875 2.1875 1.5625				30400
NA14138	14276D	34.925 69.012 46.040 38.100				95100	0.70 1.56
		1.3750 2.7170 1.8126 1.5000				21400
NA28138	28318D	34.976 80.035 46.040 34.925				111000	1.04 2.32
		1.3770 3.1510 1.8126 1.3750				24800
NA44143	44363D	36.512 92.075 55.562 39.688				147000	1.73 3.85
		1.4375 3.6250 2.1875 1.5625				32900
NA13687	13621D	38.100 69.012 46.035 38.100				98700	0.67 1.48
		1.5000 2.7170 1.8124 1.5000				22200
NA44156	44348D	39.687 88.500 55.562 39.688				147000	1.48 3.26
		1.5625 3.4843 2.1875 1.5625				32900
NA44156	44363D	39.687 92.075 55.562 39.688				147000	1.65 3.65
		1.5625 3.6250 2.1875 1.5625				32900
NA357	353D	40.000 90.119 50.800 44.450				142000	1.54 3.39
NA357	353D	1.5748 3.5480 2.0000 1.7500				32000	1.54 3.39
NA44163	44363D	41.275 92.075 55.562 39.688				174000	1.61 3.57
		1.6250 3.6250 2.1875 1.5625				39100
NA22171	22325D	43.658 82.550 44.450 34.925				135000	1.01 2.21
		1.7188 3.2500 1.7500 1.3750				30300
NA18685	18620D	44.450 79.375 41.272 33.338				90600	0.80 1.75
		1.7500 3.1250 1.6249 1.3125				20400
NA438	432D	44.450 95.250 61.915 50.800				221000	2.00 4.41
		1.7500 3.7500 2.4376 2.0000				49700
NA53176	53376D	44.450 95.250 65.090 44.450				174000	1.92 4.21
		1.7500 3.7500 2.5626 1.7500				39200
NA53176	53390D	44.450 98.425 65.090 44.450				174000	2.10 4.62
		1.7500 3.8750 2.5626 1.7500				39200
NA366	363D	50.000 90.000 50.010 42.070				177000	1.18 2.61
		1.9685 3.5433 1.9689 1.6563				39900
NA3780	3729D	50.800 93.264 65.088 52.388				213000	1.83 4.02
		2.0000 3.6718 2.5625 2.0625				47800
NA455	452D	50.800 107.950 65.090 53.975				236000	2.76 6.10
		2.0000 4.2500 2.5626 2.1250				53100
NA55200	55444D	50.800 112.712 65.088 46.038				185000	2.85 6.25
		2.0000 4.4375 2.5625 1.8125				41600
NA539	533D	53.975 111.125 79.375 63.500				300000	3.35 7.39
		2.1250 4.3750 3.1250 2.5000				67400
NA66212	66462D	53.975 117.475 73.025 53.975				259000	3.56 7.82
		2.1250 4.6250 2.8750 2.1250				58300
NA72212	72488D	53.975 123.825 77.788 55.562				287000	4.08 9.00
		2.1250 4.8750 3.0625 2.1875				64600
NA385	384CD	55.000 100.000 52.388 42.862				188000	1.56 3.45
		2.1654 3.9370 2.0625 1.6875				42200
NA397	394D	60.000 110.000 52.388 46.038				172000	2.04 4.51
		2.3622 4.3307 2.0625 1.8125				38700
NA476	472D	60.000 120.000 65.090 53.975				250000	3.45 7.59
		2.3622 4.7244 2.5626 2.1250				56100
NA558	552D	60.325 123.825 79.375 63.500				332000	4.31 9.50
		2.3750 4.8750 3.1250 2.5000				74700
NA78250	78549D	63.500 139.700 77.788 51.803				353000	5.11 11.28
		2.5000 5.5000 3.0625 2.0395				79300
NA569	563D	66.675 127.000 80.962 65.088				342000	4.36 9.64
		2.6250 5.0000 3.1875 2.5625				76900
NA482	472D	69.850 120.000 65.090 53.975				250000	2.93 6.46
		2.7500 4.7244 2.5626 2.1250				56100
NA643	632D	69.850 136.525 95.250 76.200				406000	5.88 12.92
		2.7500 5.3750 3.7500 3.0000				91200
NA484	472D	70.000 120.000 65.090 53.975				250000	2.93 6.44
		2.7559 4.7244 2.5626 2.1250				56100
NA567	563D	73.025 127.000 80.962 65.088				342000	3.86 8.52
		2.8750 5.0000 3.1875 2.5625				76900
NA495A	493D	76.200 136.525 69.850 53.975				269000	4.14 9.12
		3.0000 5.3750 2.7500 2.1250				60500
NA659	654D	76.200 152.400 95.250 76.200				430000	7.61 16.77
		3.0000 6.0000 3.7500 3.0000				96700
NA9378	9320D	76.200 177.800 109.538 74.612				632000	12.34 27.20
		3.0000 7.0000 4.3125 2.9375				142000
NA580	572D	82.550 139.992 82.550 66.675				360000	4.79 10.56
		3.2500 5.5115 3.2500 2.6250				80900
NA749	742D	82.550 155.575 101.600 85.725				656000	8.17 18.01
		3.2500 6.1250 4.0000 3.3750				147000
NA842	834D	82.550 171.450 125.412 100.012				712000	13.10 28.88
		3.2500 6.7500 4.9375 3.9375				160000
NA593	592D	88.900 152.400 82.550 63.500				376000	5.87 12.93
		3.5000 6.0000 3.2500 2.5000				84600
NA759	752D	88.900 161.925 104.775 85.725				570000	8.76 19.28
		3.5000 6.3750 4.1250 3.3750				128000
NA98350	98789D	88.900 200.025 115.888 80.216				708000	16.57 36.50
		3.5000 7.8750 4.5625 3.1581				159000
NA52375	52637D	95.250 161.925 82.547 61.912				389000	6.53 14.41
		3.7500 6.3750 3.2499 2.4375				87500
NA776	774CD	95.250 180.975 104.775 85.725				603000	11.44 25.21
		3.7500 7.1250 4.1250 3.3750				135000
NA691A	672D	100.000 168.275 92.075 69.850				461000	7.62 16.78
		3.9370 6.6250 3.6250 2.7500				104000
NA691	672D	101.600 168.275 92.075 69.850				461000	7.58 16.69
		4.0000 6.6250 3.6250 2.7500				104000
NA780	773D	101.600 180.000 104.775 85.725				603000	10.67 23.56
		4.0000 7.0866 4.1250 3.3750				135000
NA780	774CD	101.600 180.975 104.775 85.725				603000	10.62 23.43
		4.0000 7.1250 4.1250 3.3750				135000
NA861	854D	101.600 190.500 127.000 101.600				797000	14.98 33.03
		4.0000 7.5000 5.0000 4.0000				179000
HH221449NA	HH221410D	101.600 190.500 127.000 104.775				929000	14.81 32.64
		4.0000 7.5000 5.0000 4.1250				209000
NA782	774CD	104.775 180.975 104.775 85.725				603000	10.20 22.50
		4.1250 7.1250 4.1250 3.3750				135000
NA71450	71751D	114.300 190.500 106.362 80.962				633000	11.08 24.43
		4.5000 7.5000 4.1875 3.1875				142000
NA97450	97901D	114.300 228.600 115.888 84.138				655000	19.81 43.70
		4.5000 9.0000 4.5625 3.3125				147000
HM926740NA	HM926710CD	114.300 228.600 115.888 84.138				862000	20.61 45.41
		4.5000 9.0000 4.5625 3.3125				194000
NA48291	48220D	127.000 182.562 85.725 73.025				466000	7.13 15.71
		5.0000 7.1875 3.3750 2.8750				105000
NA48385	48320D	133.350 190.500 85.725 73.025				492000	7.45 16.45
NA48385	48320D	5.2500 7.5000 3.3750 2.8750				111000	7.45 16.45
NA48686	48620D	142.875 200.025 93.665 73.025				499000	8.41 18.56
		5.6250 7.8750 3.6876 2.8750				112000
NA82576	82932D	146.050 236.538 131.762 106.362				897000	20.60 45.41
		5.7500 9.3125 5.1875 4.1875				202000
HM231140NA	HM231116D	146.050 241.300 131.762 106.362				1040000	22.00 48.50
		5.7500 9.5000 5.1875 4.1875				234000
NA82587	82932D	149.225 236.538 131.762 106.362				897000	19.82 43.73
		5.8750 9.3125 5.1875 4.1875				202000
HM231149NA	HM231116D	149.225 241.300 131.762 106.362				1040000	21.24 46.82
		5.8750 9.5000 5.1875 4.1875				234000
M231647	M231616XD	150.967 229.873 108.000 116.000				597000	16.14 35.57
		5.9436 9.0501 4.2520 4.5669				134000
NA99600	99102CD	152.400 254.000 142.875 111.125				1150000	26.54 58.51
		6.0000 10.0000 5.6250 4.3750				258000
NA94650	94118D	165.100 298.450 142.875 111.125				1150000	41.69 91.93
		6.5000 11.7500 5.6250 4.3750				258000
NA87700	87112D	177.800 282.575 107.950 79.375				748000	23.05 50.80
		7.0000 11.1250 4.2500 3.1250				168000
NA94700	94117D	177.800 298.450 142.875 139.700				1150000	40.07 88.35
		7.0000 11.7500 5.6250 5.5000				258000
NA94700	94118D	177.800 298.450 142.875 111.125				1150000	37.85 83.46
		7.0000 11.7500 5.6250 4.3750				258000
NA537075	537103D	190.500 260.350 66.675 50.800				410000	9.54 21.00
		7.5000 10.2500 2.6250 2.0000				92100
NA132083	132126D	203.200 317.500 120.650 88.900				919000	33.51 73.89
		8.0000 12.5000 4.7500 3.5000				207000
HM252343NA	HM252311D	254.000 422.275 173.038 128.588				2610000	85.70 188.93
		10.0000 16.6250 6.8125 5.0625				587000
HM252344NA	HM252315CD	254.000 431.724 173.038 128.588				2690000	96.42 212.55
		10.0000 16.9970 6.8125 5.0625				605000
HM252343NA	HM252315CD	254.000 431.724 173.038 128.588				2610000	92.05 202.94
		10.0000 16.9970 6.8125 5.0625				587000
HM252349NA	HM252311D	260.350 422.275 173.038 128.588				2690000	86.59 190.86
		10.2500 16.6250 6.8125 5.0625				605000
HM252348NA	HM252311D	260.350 422.275 173.038 128.588				2610000	82.22 181.24
		10.2500 16.6250 6.8125 5.0625				587000
HM252349NA	HM252315CD	260.350 431.724 173.038 128.588				2690000	92.94 204.87
		10.2500 16.9970 6.8125 5.0625				605000
HM252348NA	HM252315CD	260.350 431.724 173.038 128.588				2610000	88.57 195.25
		10.2500 16.9970 6.8125 5.0625				587000
NA329116	329173CD	300.787 438.048 161.925 123.825				1880000	73.86 162.84
		11.8420 17.2460 6.3750 4.8750				422000
NA329115	329173CD	300.787 438.048 161.925 123.825				1920000	75.86 167.26
		11.8420 17.2460 6.3750 4.8750				432000
NA329116	329176D	300.787 444.500 161.925 161.925				1880000	83.75 184.65
		11.8420 17.5000 6.3750 6.3750				422000
NA329120	329173CD	304.800 438.048 161.925 123.825				1880000	71.44 157.49
		12.0000 17.2460 6.3750 4.8750				422000
NA329121	329173CD	304.800 438.048 161.925 123.825				1920000	73.44 161.91
		12.0000 17.2460 6.3750 4.8750				432000
NA231400	232026D	355.600 514.350 146.050 107.950				1830000	91.10 200.84
		14.0000 20.2500 5.7500 4.2500				412000
NA285160	285228D	406.400 574.675 157.162 106.362				1930000	112.79 248.66
		16.0000 22.6250 6.1875 4.1875				434000

Introduction

Inner Rings (Cones): TNA bearings have two inner rings, or cones, each mounted on the rotating shaft. These cones have inner raceway surfaces for the tapered rollers.
Outer Cups: The outer part of the bearing consists of two double cups in tandem, providing outer raceway surfaces for the tapered rollers.
Tapered Rollers: Positioned between the inner and outer components, the tapered rollers facilitate the bearing’s ability to support both radial and axial loads.
Spacer: A spacer is used between the two inner cones to set the proper axial clearance and preload. The spacer enhances the rigidity of the bearing assembly.

The TNA configuration is suitable for applications where axial loads need to be accommodated in both directions. These bearings are commonly used in heavy machinery, industrial gearboxes, and other applications where higher load-carrying capacities and increased rigidity are essential.

Proper selection and maintenance of TNA bearings are crucial for ensuring optimal performance and longevity in a given application. Considerations such as load capacity, speed, and specific application requirements should guide the selection process. Regular maintenance, proper installation, and adequate lubrication are also vital for extending the bearing’s service life.

TNA bearings provide versatility and efficiency in applications requiring robust performance under demanding conditions, making them suitable for various industrial sectors.

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Tapered Roller Bearings

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