Part Number MM55BS120 TUH, Fafnir® Single Row Ball Screw Support Bearings (MM-BS) On The Timken Company

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All Product Types > ENGINEERED BEARINGS > Ball Bearings > Precision Ball Bearings > Fafnir® Single Row Ball Screw Support Bearings (MM-BS) > Part Number MM55BS120 TUH


	Part Number MM55BS120 TUH, Fafnir® Single Row Ball Screw Support Bearings (MM-BS)

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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.

Unit of Measure: Imperial Metric Both

Specifications · Dimensions · Basic Load Ratings · Factors · Abutment and Fillet Dimensions

Specifications

Manufacturing Part Number		MM55BS120TUH

Rows per Set		Triplex

Design Units		Metric

d - Bore		55 mm

Ball Type		STEEL

Cage Type		CR - Phenolic Outer Land Riding Cage

Dimensions

D - Outer Diameter		120 mm 4.7244 in

Bearing Width		22.5 mm 0.8858 in

Total Width		67.5 mm 2.6574 in

Contact Angle		60 º

Basic Load Ratings

C0 - Static Radial Rating (per row)		133400 N 30000 lbf

Ce - Dynamic Radial Rating (per row)		75600 N 17000 lbf

C1 ISO - Dynamic Radial Rating (per row)		68200 N 15330 lbf

Factors

Limiting Speed (Grease) (per row)		1700 rpm

Limiting Speed (Oil)		3400 rpm

Abutment and Fillet Dimensions

R - Inner Ring "To Clear" Radius¹

1 mm
0.039 in

r - Outer Ring "To Clear" Radius²

1 mm
0.039 in

da - Inner Ring Backing Diameter

96.403 mm
3.7954 in

Da - Outer Ring Backing Diameter

97.719 mm
3.8472 in

¹ Maximum housing fillet radius that bearing corners will clear.
² Maximum shaft fillet radius that bearing corners will clear.

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Part Number MM55BS120 TUH, Fafnir® Single Row Ball Screw Support Bearings (MM-BS)

Manufacturing Part Number

Rows per Set

Design Units

d - Bore

Ball Type

Cage Type

D - Outer Diameter

Bearing Width

Total Width

Contact Angle

C0 - Static Radial Rating (per row)

Ce - Dynamic Radial Rating (per row)

C1 ISO - Dynamic Radial Rating (per row)

Limiting Speed (Grease) (per row)

Limiting Speed (Oil)

R - Inner Ring "To Clear" Radius1

r - Outer Ring "To Clear" Radius2

da - Inner Ring Backing Diameter

Da - Outer Ring Backing Diameter

R - Inner Ring "To Clear" Radius¹

r - Outer Ring "To Clear" Radius²