All Product Types > ENGINEERED BEARINGS > Ball Bearings > Precision Ball Bearings > Fafnir® Single Row Imperial Ball Screw Support Bearings (MM9-H) > Part Number MM9321WI 3H QUM  

Part Number MM9321WI 3H QUM, Fafnir® Single Row Imperial Ball Screw Support Bearings (MM9-H)

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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.




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

Specifications

Rows per Set
Quadruplex

Design Units
Metric

d - Bore
101.600 mm

Ball Type
STEEL

Cage Type
CR - Phenolic Outer Land Riding Cage

Manufacturing Part Number
MM9321WI 3HQUM


Dimensions

D - Outer Diameter
145 mm
5.7087 in

Bearing Width
22.23 mm
0.8750 in

Total Width
88.92 mm
3.5 in

Contact Angle
60 º


Basic Load Ratings

C0 - Static Radial Rating (per row)
115700 N
26000 lbf

Ce - Dynamic Radial Rating (per row)1
57400 N
12900 lbf

C1 ISO - Dynamic Radial Rating (per row)
51800 N
11630 lbf
1 Based on 106 revolutions of calculated fatigue life.


Factors

Limiting Speed (Grease) (per row)
1000 rpm

Limiting Speed (Oil) (per row)
2000 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
122.796 mm
4.8345 in

Da - Outer Ring Backing Diameter
123.825 mm
4.875 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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