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, locknut and washer, stabilizing ring, and triple ring seals.
  • To order pillow block housing only, use the numbers listed in the "Housing Only" column. These units include: cap, base, cap bolts, triple ring seals and stabilizing ring.
  • Assembly and pillow blocks 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., SDAFS 22220).

Note: Speed ratings are found in dimension tables in the spherical roller bearing section.
Unit of Measure

Specifications

Bearing Number

 N/A 22318

Diameter S-2

 N/A 4 1/8 in

Diameter S-3

 N/A 3.3750 in

A

 N/A 4.75 in

B

 N/A 15.5 in

C

 N/A 6.125 in

D

 N/A 2 in

E Max.

 N/A 13.5 in

E Min.

 N/A 12 in

F

 N/A 3.625 in
H1 N/A 9.4375 in

Oil Level K

 N/A 2 in
L2 N/A 6.8750 in

Y

 N/A 2.0469 in

No. of Base Bolts Required

 N/A 4

Size of Base Bolts Required

 N/A 3/4

Bolt Hole Length

 N/A 1.5 in

Bolt Hole Width

 N/A 0.75 in

Locknut

 N/A AN18

Lockwasher

 N/A W18
Housing Only3 N/A SDAF318
Stabilizing Ring 1 Req'd4 N/A SR-21-18

Triple Seal 2 Req’d at S-2

 N/A LOR112

Triple Seal 2 Req’d at S-3

 N/A LOR191

Full Timken Part Number

 N/A SDAF22318

Basic Load Ratings

C0 - Static Radial Rating

 N/A 148000 lbf659000 N

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

 N/A 136000 lbf606000 N

Factors

e - ISO Factor5 N/A 0.32
Y0 - ISO Factor6 N/A 2.04
Y1 - ISO Factor7 N/A 2.09
Y2 - ISO Factor8 N/A 3.11

Reference Thermal Speed Rating (Grease)

 N/A 2900 rpm
Reference Thermal Speed Rating (Oil)9 N/A 3400 rpm
Cg - Geometry Factor10 N/A 0.0685
  • 1 Tolerance -0 to + 0.4 mm (-0 to +1/64 in)
  • 2 Tolerance -0 to + 0.4 mm (-0 to +1/64 in)
  • 3 "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.
  • 4 Stabilizing ring is used for fixed (FX) block; do not use for float (FL) mounting.
  • 5 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 6 These factors apply for both inch and metric calculations. See engineering
  • 7 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 8 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 9 See thermal speed ratings in the engineering section.
  • 10 Geometry constant for Lubrication Life Adjustment Factor a3l.