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

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.

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 3.9370 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 3.9370 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 3.9370 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

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 3.9370 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 3.9370 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 3.9370 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 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 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 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 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 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 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