The Bow Spring Selection guide is a quick reference to determine the proper bow spring for a given casing size to hole size combination. The guide applies to all centralizers and turbolizer. The bow spring designation forms the last two digits of the product number.

BOW SPRING SELECTION GUIDE
Casing
Size
O.D.
(Inches) 		Hole Size (inches) Casing
Size
O.D.
(Inches)
4 1/2
5 3/4
6 1/8
6 1/2
7 3/8
8 3/8
8 3/4
9 1/2
10 1/2
12
14
17
19 1/2
22
24
26
Thru Thru Thru Thru Thru Thru Thru Thru Thru Thru Thru Thru Thru Thru - -
4 3/4
6
6 3/8
6 3/4
7 7/8
8 5/8
9
10
11
12 1/4
15 1/2
18 5/8
20 1/2
23
-
-
2 3/8
30
36
46
46
57
57
85
85
85
85
 
 
 
 
 
 
2 3/8
2 7/8
16
30/36
36
46
46
57
57
85
85
85
 
 
 
 
 
 
2 7/8
3 1/2
*12
25
30
36
46
46
57
85
85
85
 
 
 
 
 
 
3 1/2
4 1/2
 
*12/16
*16
25
36
46
46
57
57/85
85
 
 
 
 
 
 
4 1/2
5
 
*12
*12/16
*16
30/36
36
46
46/57
57
85
85
 
 
 
 
 
5
5 1/2
 
 
 
*12
25
30/36
36
46
57
85
85
 
 
 
 
 
5 1/2
6 5/8
 
 
 
 
*12
*16/25
25
36
46
57
85
 
 
 
 
 
6 5/8
7
 
 
 
 
 
*16
25
36
46
57
85
 
 
 
 
 
7
7 5/8
 
 
 
 
 
*12
*12
25/30
36
57
85
 
 
 
 
 
7 5/8
8 5/8
 
 
 
 
 
 
 
 
30
46
57/85
85
 
 
 
 
8 5/8
9 5/8
 
 
 
 
 
 
 
 
*12
36
46/57
85
 
 
 
 
9 5/8
10 3/4
 
 
 
 
 
 
 
 
 
25
46
85
 
 
 
 
10 3/4
11 3/4
 
 
 
 
 
 
 
 
 
 
36/46
57
 
 
 
 
11 3/4
13 3/8
 
 
 
 
 
 
 
 
 
 
 
46
 
 
 
 
13 3/8
16
 
 
 
 
 
 
 
 
 
 
 
25/36
57
85
 
 
16
18 5/8
 
 
 
 
 
 
 
 
 
 
 
 
 
46/57
57
85
18 5/8
20                             46 57 20

Notes:

  1. (*) Close tolerance-internal stop collar
  2. Where two bow sping sizes are indicated, lower should be used for smaller hole sizes or with light wt. csg. and 2/jnt. installation.

Ordering Suggestions
To assure the correct size and type of equipment is obtained, please specify:

  1. Casing O.D. on which the equipment will be used
  2. Product number or complete description of the item(s)
  3. Hole size or casing I.D. in which the equipment will be placed
  4. Any restriction through which the equipment will be run
  5. If casing or tubing is externally "upset"