Fafnir® Single Row Ball Screw Support Bearings (MM-BS) On The Timken Company

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Timken® angular contact ball bearings are designed for combination radial and axial loading. Single-row bearings have high thrust capacity in one direction. Some single-row bearings are specifically designed for duplex mounting in sets for maximum performance.

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Rows per Set

d - Bore (mm)

D - Outer Diameter (in)

D - Outer Diameter (mm)

Bearing Width (in)

Bearing Width (mm)

Total Width (in)

Total Width (mm)

Ce - Dynamic Radial Rating (per row) (lbf)

Ce - Dynamic Radial Rating (per row) (N)

Limiting Speed (Grease) (per row) (rpm)

Limiting Speed (Oil) (rpm)

Part Number	Rows per Set	d - Bore	D - Outer Diameter	Bearing Width	Total Width	Contact Angle	C0 - Static Radial Rating (per row)	Ce - Dynamic Radial Rating (per row)	Ball Type	CAD

MM50BS100 DUL	N/A Duplex	N/A 50 mm	N/A 3.937 in100 mm	N/A 0.8858 in22.5 mm	N/A 1.7716 in45 mm	N/A 60 º	N/A 21000 lbf93400 N	N/A 16010 lbf71200 N	N/A STEEL	N/A
MM50BS100 TUL	N/A Triplex	N/A 50 mm	N/A 3.937 in100 mm	N/A 0.8858 in22.5 mm	N/A 2.6574 in67.5 mm	N/A 60 º	N/A 21000 lbf93400 N	N/A 16010 lbf71200 N	N/A STEEL	N/A
MM50BS100 QUL	N/A Quadruplex	N/A 50 mm	N/A 3.937 in100 mm	N/A 0.8858 in22.5 mm	N/A 3.5432 in90 mm	N/A 60 º	N/A 21000 lbf93400 N	N/A 16010 lbf71200 N	N/A STEEL	N/A
MM55BS90 SUH	N/A Single	N/A 55 mm	N/A 3.5433 in90 mm	N/A 0.5906 in15 mm	N/A 0.5906 in15 mm	N/A 60 º	N/A 13700 lbf60900 N	N/A 9310 lbf41400 N	N/A STEEL	N/A
MM55BS90 DUH	N/A Duplex	N/A 55 mm	N/A 3.5433 in90 mm	N/A 0.5906 in15 mm	N/A 1.1812 in30 mm	N/A 60 º	N/A 13700 lbf60900 N	N/A 9310 lbf41400 N	N/A STEEL	N/A
MM55BS90 TUH	N/A Triplex	N/A 55 mm	N/A 3.5433 in90 mm	N/A 0.5906 in15 mm	N/A 1.7718 in45 mm	N/A 60 º	N/A 13700 lbf60900 N	N/A 9310 lbf41400 N	N/A STEEL	N/A
MM55BS90 QUH	N/A Quadruplex	N/A 55 mm	N/A 3.5433 in90 mm	N/A 0.5906 in15 mm	N/A 2.3624 in60 mm	N/A 60 º	N/A 13700 lbf60900 N	N/A 9310 lbf41400 N	N/A STEEL	N/A
MM55BS90 SUM	N/A Single	N/A 55 mm	N/A 3.5433 in90 mm	N/A 0.5906 in15 mm	N/A 0.5906 in15 mm	N/A 60 º	N/A 13700 lbf60900 N	N/A 9310 lbf41400 N	N/A STEEL	N/A
MM55BS90 DUM	N/A Duplex	N/A 55 mm	N/A 3.5433 in90 mm	N/A 0.5906 in15 mm	N/A 1.1812 in30 mm	N/A 60 º	N/A 13700 lbf60900 N	N/A 9310 lbf41400 N	N/A STEEL	N/A
MM55BS90 TUM	N/A Triplex	N/A 55 mm	N/A 3.5433 in90 mm	N/A 0.5906 in15 mm	N/A 1.7718 in45 mm	N/A 60 º	N/A 13700 lbf60900 N	N/A 9310 lbf41400 N	N/A STEEL	N/A
MM55BS90 QUM	N/A Quadruplex	N/A 55 mm	N/A 3.5433 in90 mm	N/A 0.5906 in15 mm	N/A 2.3624 in60 mm	N/A 60 º	N/A 13700 lbf60900 N	N/A 9310 lbf41400 N	N/A STEEL	N/A
MM55BS90 SUL	N/A Single	N/A 55 mm	N/A 3.5433 in90 mm	N/A 0.5906 in15 mm	N/A 0.5906 in15 mm	N/A 60 º	N/A 13700 lbf60900 N	N/A 9310 lbf41400 N	N/A STEEL	N/A
MM55BS90 DUL	N/A Duplex	N/A 55 mm	N/A 3.5433 in90 mm	N/A 0.5906 in15 mm	N/A 1.1812 in30 mm	N/A 60 º	N/A 13700 lbf60900 N	N/A 9310 lbf41400 N	N/A STEEL	N/A
MM55BS90 TUL	N/A Triplex	N/A 55 mm	N/A 3.5433 in90 mm	N/A 0.5906 in15 mm	N/A 1.7718 in45 mm	N/A 60 º	N/A 13700 lbf60900 N	N/A 9310 lbf41400 N	N/A STEEL	N/A
MM55BS90 QUL	N/A Quadruplex	N/A 55 mm	N/A 3.5433 in90 mm	N/A 0.5906 in15 mm	N/A 2.3624 in60 mm	N/A 60 º	N/A 13700 lbf60900 N	N/A 9310 lbf41400 N	N/A STEEL	N/A
MM55BS120 SUH	N/A Single	N/A 55 mm	N/A 4.7244 in120 mm	N/A 0.8858 in22.5 mm	N/A 0.8858 in22.5 mm	N/A 60 º	N/A 30000 lbf133400 N	N/A 17000 lbf75600 N	N/A STEEL	N/A
MM55BS120 DUH	N/A Duplex	N/A 55 mm	N/A 4.7244 in120 mm	N/A 0.8858 in22.5 mm	N/A 1.7716 in45 mm	N/A 60 º	N/A 30000 lbf133400 N	N/A 17000 lbf75600 N	N/A STEEL	N/A
MM55BS120 TUH	N/A Triplex	N/A 55 mm	N/A 4.7244 in120 mm	N/A 0.8858 in22.5 mm	N/A 2.6574 in67.5 mm	N/A 60 º	N/A 30000 lbf133400 N	N/A 17000 lbf75600 N	N/A STEEL	N/A
MM55BS120 QUH	N/A Quadruplex	N/A 55 mm	N/A 4.7244 in120 mm	N/A 0.8858 in22.5 mm	N/A 3.5432 in90 mm	N/A 60 º	N/A 30000 lbf133400 N	N/A 17000 lbf75600 N	N/A STEEL	N/A
MM55BS120 SUM	N/A Single	N/A 55 mm	N/A 4.7244 in120 mm	N/A 0.8858 in22.5 mm	N/A 0.8858 in22.5 mm	N/A 60 º	N/A 30000 lbf133400 N	N/A 17000 lbf75600 N	N/A STEEL	N/A
MM55BS120 DUM	N/A Duplex	N/A 55 mm	N/A 4.7244 in120 mm	N/A 0.8858 in22.5 mm	N/A 1.7716 in45 mm	N/A 60 º	N/A 30000 lbf133400 N	N/A 17000 lbf75600 N	N/A STEEL	N/A
MM55BS120 TUM	N/A Triplex	N/A 55 mm	N/A 4.7244 in120 mm	N/A 0.8858 in22.5 mm	N/A 2.6574 in67.5 mm	N/A 60 º	N/A 30000 lbf133400 N	N/A 17000 lbf75600 N	N/A STEEL	N/A
MM55BS120 QUM	N/A Quadruplex	N/A 55 mm	N/A 4.7244 in120 mm	N/A 0.8858 in22.5 mm	N/A 3.5432 in90 mm	N/A 60 º	N/A 30000 lbf133400 N	N/A 17000 lbf75600 N	N/A STEEL	N/A
MM55BS120 SUL	N/A Single	N/A 55 mm	N/A 4.7244 in120 mm	N/A 0.8858 in22.5 mm	N/A 0.8858 in22.5 mm	N/A 60 º	N/A 30000 lbf133400 N	N/A 17000 lbf75600 N	N/A STEEL	N/A
MM55BS120 DUL	N/A Duplex	N/A 55 mm	N/A 4.7244 in120 mm	N/A 0.8858 in22.5 mm	N/A 1.7716 in45 mm	N/A 60 º	N/A 30000 lbf133400 N	N/A 17000 lbf75600 N	N/A STEEL	N/A

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No Preference
0.3937
0.4331
0.5906
0.7874
0.8662
0.8858
0.9055
1.1811
1.1812
1.2993
1.5748
1.7324
1.7716
1.7718
1.811
2.3622
2.3624
2.6574
2.7165
3.1496
3.5432
3.622

No Preference
10
11
15
20
22
22.5
23
30
33
40
44
45
46
60
67.5
69
80
90
92