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As a policy of continual improvement, RMF reserves the right to alter the specification without prior notice.
201.028 REV 1 Date of Issue: 18 June 2018
Other Standards
Although the ISO 4406:1999 standard is being used extensively within the hydraulics industry other standards are
occasionally required and a comparison may be requested.
The following table gives a very general comparison but often no direct comparison is possible due to the
different classes and sizes involved.
ISO4409:1999 DEF.STD 05/42
Table A Table B
NAS 1638
ISO 11218
SAE 749
13/11/8 2
14/12/9 3 0
15/13/10 4 1
16/14/9 400F
16/14/11 5 2
17/15/9 400
17/15/10 800F
17/15/12 6 3
18/16/10 800
18/16/11 1300F
18/16/13 7 4
19/17/11 1300 2000F
19/17/14 8 5
20/18/12 2000
20/18/13 4400F
20/18/15 9 6
21/19/13 4400 6300F
21/19/16 10
22/20/13 6300
22/20/17 11
23/21/14 15000
23/21/18 12
24/22/15 21000
25/23/17 100000