FLUSH GROUND for Versatility, Ease of Assembly, and Simplified Inventory Control

BMBU Series

Flush GroundAngular Contact Ball Bearings

Flush Ground Type

Machined Brass Cage

Improved Lubrication Flow

Any combination of NACHI Flush Ground Angular Contact Ball Bearings will provide the desired clearance. With the Universal Flush Grinding, bearings can be mounted

as DB, DF, and DT pairs, or combined to form triplex and quadraplex sets.

OfficesNACHI AMERICA, INC.Corporate Headquarters715 Pushville RoadGreenwood, IN 46143Phone: 317-530-1001Fax: 317-530-1011

NACHI AMERICA INC. - L.A. OFFICE12652 Alondra BoulevardCerritos, CA 90703Phone: 562-802-0055Fax: 562-802-2455

NACHI MEXICANA, S.A. de C.V.Calle Tequisquipan 2, Aerotech Industrial ParkLocalidad Galeras, Municipio de Colon, Queretaro, Mexico C.P. 76295Phone: 52-442-153-2424Fax: 52-442-153-2435

NACHI AMERICA INC. - MIAMI OFFICE2315 NW 107th Ave.Miami, FL 33172Phone: 305-591-0054Fax: 305-591-3110

BEARING ENGINEERINGPhone: 800-829-5787Email: bearingsengineer@nachiamerica.comwww.nachiamerica.com/Bearings

Technical Information

June 2018CATALOG NO.: NAB 1801-1

Bore (mm)over incl.

10 18 18 ~ 3218 30 20 ~ 4030 40 25 ~ 4540 50 30 ~ 5050 65 35 ~ 6065 80 40 ~ 6580 100 55 ~ 80

100 120 60 ~ 85120 140 75 ~ 105140 150 85 ~ 115

2A (µm)

BMBU Series standard clearance

Note: Values are before mounting under no load condition

LoadBearing Ratings

No. d D B a Dynamic Static7310BMBU 50 110 27 2.0 1.0 20.1 66,300 45,3007311BMBU 55 120 29 2.0 1.0 22.3 76,600 53,3007312BMBU 60 130 31 2.1 1.1 24.4 87,500 61,9007313BMBU 65 140 33 2.1 1.1 26.6 99,100 71,2007314BMBU 70 150 35 2.1 1.1 28.7 111,000 81,1007315BMBU 75 160 37 2.1 1.1 30.9 121,000 91,7007316BMBU 80 170 39 2.1 1.1 33.0 131,000 103,0007317BMBU 85 180 41 3.0 1.1 35.2 141,000 115,0007318BMBU 90 190 43 3.0 1.1 37.3 161,000 139,0007319BMBU 95 200 45 3.0 1.1 39.5 172,000 153,0007220BMBU 100 180 34 2.1 1.1 41.8 129,000 110,0007320BMBU 100 215 47 3.0 1.1 42.7 196,000 180,0007222BMBU 110 200 38 2.1 1.1 46.1 152,000 139,0007322BMBU 110 240 50 3.0 1.1 48.5 231,000 227,0007224BMBU 120 215 40 2.1 1.1 50.3 164,000 156,0007226BMBU 130 230 40 3.0 1.1 55.5 184,000 186,0007228BMBU 140 250 42 3.0 1.1 60.8 189,000 201,0007230BMBU 150 270 45 3.0 1.1 65.6 233,000 263,000

r1 minr min

Boundary Dimensions (mm)

Bearing @ 900 RPM7310BMB 14,905 2,420

2,7963,1943,6174,0524,4174,7825,1475,8776,2784,7097,1545,5488,4325,9866,7166,8998,505

2,1142,4432,7903,1603,5403,8584,1774,4965,1345,4854,1136,2504,8477,3665,2305,8676,0277,430

7311BMB 17,2207312BMB 19,6717313BMB 22,2797314BMB 24,9547315BMB 27,2027316BMB 29,4507317BMB 31,6987318BMB 36,1947319BMB 38,6677220BMB 29,0007320BMB 44,0637222BMB 34,1717322BMB 51,9317224BMB 36,8697226BMB 41,3657228BMB 42,4897230BMB 52,380

Axial Load (lbf) to achieve1 year bearing life (8,760 hours)Single

C (lbf)

Load Rating

r

Axial Load (lbf) to achieve2 year bearing life (17,520 hours)

@ 1200 RPM @ 1800 RPM3,3563,8774,4295,0165,6196,1256,6317,1378,1508,7066,5309,9217,694

11,6938,3019,3149,567

11,794

3,0493,5234,0244,5585,1055,5656,0256,4857,4047,9105,9339,0146,990

10,6247,5428,4628,692

10,716

2,6643,0773,5153,9814,4594,8615,2635,6656,4686,9105,1837,8746,1079,2816,5897,3927,5939,361

@ 900 RPM @ 1200 RPM @ 1800 RPM2,6643,0773,5153,9814,4594,8615,2635,6656,4686,9105,1837,8746,1079,2816,5897,3927,5939,361

Bearing @ 900 RPM7310BMB7311BMB7312BMB7313BMB7314BMB7315BMB7316BMB7317BMB7318BMB7319BMB7220BMB7320BMB7222BMB7322BMB7224BMB7226BMB7228BMB7230BMB

24,14627,89731,86736,09140,42544,06747,70951,35158,63562,64146,98171,38155,35784,12859,72767,01168,83284,856

2,4202,7963,1943,6174,0524,4174,7825,1475,8776,2784,7097,1545,5488,4325,9866,7166,8998,505

2,1142,4432,7903,1603,5403,8584,1774,4965,1345,4854,1136,2504,8477,3665,2305,8676,0277,430

Axial Load (lbf) to achieve1 year bearing life (8,760 hours)Duplex

Axial Load (lbf) to achieve2 year bearing life (17,520 hours)

@ 1200 RPM @ 1800 RPM3,3563,8774,4295,0165,6196,1256,6317,1378,1508,7066,5309,9217,69411,6938,3019,3149,56711,794

3,0493,5234,0244,5585,1055,5656,0256,4857,4047,9105,9339,0146,99010,6247,5428,4628,69210,716

2,6643,0773,5153,9814,4594,8615,2635,6656,4686,9105,1837,8746,1079,2816,5897,3927,5939,361

@ 900 RPM @ 1200 RPM @ 1800 RPM2,6643,0773,5153,9814,4594,8615,2635,6656,4686,9105,1837,8746,1079,2816,5897,3927,5939,361

C (lbf)

Load Rating

r

Bearing @ 900 RPM7310BMB 32,194

37,19642,48948,12253,90058,75663,61268,46878,18083,52162,64195,17573,809

112,17179,63689,34891,776

113,142

5,2276,0396,8997,8138,7529,54010,32911,11712,69413,56110,17115,45311,98418,21312,93014,50714,90218,371

4,5675,2766,0276,8267,6458,3349,0239,71211,08911,8478,88513,50010,46915,91111,29612,67313,01816,048

7311BMB7312BMB7313BMB7314BMB7315BMB7316BMB7317BMB7318BMB7319BMB7220BMB7320BMB7222BMB7322BMB7224BMB7226BMB7228BMB7230BMB

Axial Load (lbf) to achieve1 year bearing life (8,760 hours)Triplex

C (lbf)

Load Rating

r

Axial Load (lbf) to achieve2 year bearing life (17,520 hours)

@ 1200 RPM @ 1800 RPM7,2498,3759,567

10,83512,13613,23014,32315,41617,60318,80614,10421,43016,61925,25617,93120,11820,66425,475

6,5867,6098,6929,844

11,02612,02013,01314,00715,99317,08612,81519,47015,09922,94716,29118,27818,77523,146

5,7536,6477,5938,6009,633

10,50011,36812,23613,97114,92611,19517,00913,19020,04614,23215,96716,40120,220

@ 900 RPM @ 1200 RPM @ 1800 RPM5,7536,6477,5938,6009,633

10,50011,36812,23613,97114,92611,19517,00913,19020,04614,23215,96716,40120,220

Bearing @ 900 RPM7310BMB7311BMB7312BMB7313BMB7314BMB7315BMB7316BMB7317BMB7318BMB7319BMB7220BMB7320BMB7222BMB7322BMB7224BMB7226BMB7228BMB7230BMB

39,34945,46251,93158,81565,87871,81377,74883,68395,553102,08176,561116,32590,211137,09797,333109,203112,171138,284

5,2276,0396,8997,8138,7529,540

10,32911,11712,69413,56110,17115,45311,98418,21312,93014,50714,90218,371

4,5675,2766,0276,8267,6458,3349,0239,712

11,08911,8478,885

13,50010,46915,91111,29612,67313,01816,048

Axial Load (lbf) to achieve1 year bearing life (8,760 hours)Quadplex

Axial Load (lbf) to achieve2 year bearing life (17,520 hours)

@ 1200 RPM @ 1800 RPM7,2498,3759,56710,83512,13613,23014,32315,41617,60318,80614,10421,43016,61925,25617,93120,11820,66425,475

6,5867,6098,6929,84411,02612,02013,01314,00715,99317,08612,81519,47015,09922,94716,29118,27818,77523,146

5,7536,6477,5938,6009,63310,50011,36812,23613,97114,92611,19517,00913,19020,04614,23215,96716,40120,220

@ 900 RPM @ 1200 RPM @ 1800 RPM5,7536,6477,5938,6009,63310,50011,36812,23613,97114,92611,19517,00913,19020,04614,23215,96716,40120,220

C (lbf)

Load Rating

r

r

rr

r

a

d

D

40º

B

¹

¹

A A

2AAA

2A

DB DF