The Timken Company
The Timken Company
4500 Mt Pleasant St. NW
N. Canton, OH 44720
Phone: (234) 262-3000
E-Mail: CustomerCAD@timken.com • Web site: www.timken.com
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  • Each assembly includes the housing cap and base, cap bolts, bearing, bearing adapter, locknut and lockwasher, stabilizing ring and triple ring seals.
  • If only the pillow block is desired, use the numbers listed in column "Housing Only" column. These units include: cap, base, cap bolts, triple ring seals and stabilizing ring.
  • Assembly and pillow blocks as described on this page constitute fixed units.
  • To order float units, specify part number plus suffix "Float" or "FL".
  • If one end closed assembly is required, specify “CL” in assembly number when ordering.
  • All assemblies shown are furnished in cast iron. If cast steel is desired, add the letter "S" to the alpha prefix (e.g., SAFS 23024).
  • Please note that for applications SAF23048 and larger, the shaft size must be included in the part description when ordering (e.g., SAF23048-8 15/16).

When ordering non-standard pillow block assemblies specify the shaft size.
Unit of Measure

Specifications

Bearing Number

 N/A 23028K

Diameter S-1

 N/A 4.8750 in

A

 N/A 5.25 in

B

 N/A 16.5 in

C

 N/A 4.75 in

D

 N/A 2 1/8 in

E Max.

 N/A 14.5 in

E Min.

 N/A 13.25 in

F

 N/A 2.75 in

H

 N/A 10 1/4 in

L

 N/A 7.375 in

Bolt Hole Length

 N/A 1.375 in

Bolt Hole Width

 N/A 0.75 in

No. of Base Bolts Required

 N/A 4
Adapter Assembly Number1 N/A SNW-3028 x 4-7/8
Housing Only2 N/A SAF028K x 4-7/8
Stabilizing Ring 1 Req'd3 N/A SR-0-20

Triple Seal Req'd

 N/A LOR 121

Seal Type

 N/A Triple Ring Seal

Full Timken Part Number

 N/A SAF23028K4-7/8

Basic Load Ratings

C0 - Static Radial Rating

 N/A 180000 lbf802000 N

C1(2) - Dynamic Radial Rating (Two-Rows)

 N/A 124000 lbf551000 N

Factors

e - ISO Factor4 N/A 0.22
Y0 - ISO Factor5 N/A 3.03
Y1 - ISO Factor6 N/A 3.1
Y2 - ISO Factor7 N/A 4.61

Reference Thermal Speed Rating (Grease)

 N/A 2300 rpm
Reference Thermal Speed Rating (Oil)8 N/A 2800 rpm
Cg - Geometry Factor9 N/A 0.0819
  • 1 Includes sleeve, locknut and lockwasher. Add shaft size to order.
  • 2 "Housing Only" includes: cap, base, cap bolts, triple ring seals and stabilizing ring as required. When ordering non-standard housing only specify the shaft size.
  • 3 Stabilizing ring is used for fixed (FX) block; do not use for float (FL) mounting.
  • 4 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 5 These factors apply for both inch and metric calculations. See engineering
  • 6 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 7 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 8 See thermal speed ratings in the engineering section.
  • 9 Geometry constant for Lubrication Life Adjustment Factor a3l.