6-4
Parker Hannifi n Corporation • O-Ring Division
2360 Palumbo Drive, Lexington, KY 40509
Phone: (859) 269-2351 • Fax: (859) 335-5128
www.parkerorings.com
Back-Up Rings
Parker O-Ring Handbook
I.D.W
T Ref.
A
.010 R. Max.
Section W-W
A
R
Parker Parbak
8-Series Dimensions
Notes: 1. Parbak sizes are designed to correspond with the Parker 2-xxx, 3-xxx and AS568A series O-ring with which they are used.
2. Complete call-out consists of the digit 8, the dash number for the size wanted and the rubber material. Example: N1444-90 8-009.
Table 6-1: Parker Parbak 8-Series Dimensions
Parker Parbaks were developed primarily for service in petro-
leum based hydraulic fl uids, at -4°C to 121°C (-40°F to 250°F).
Parker’s standard Parbak compound N1444-90, provides the
maximum benefi ts in back-up ring service. Compounds for
use in other fl uids and for temperatures up to 204°C (400°F)
are available upon request.
Parbaks will stretch up to 50%, and are quickly and easily
installed. Advantages of the contour design are obtained
regardless of how Parbaks are installed — they may be in-
stalled with the concave face in either direction, toward or
away from the O-ring.
004 .096 .005 .087 .049 .045 .003 .053 .003
005 .127
006 .140
007 .171
008 .202
009 .234
010 .265
011 .327
012 .390
013 .455 .005
014 .518 .005
015 .580 .007
016 .643 .009
017 .705
018 .768
019 .830
020 .893
021 .955 .009
022 1.018 .010
023 1.080 .010
024 1.143 .010
025 1.205 .011
026 1.268 .011
027 1.330 .011
028 1.393 .013
029 1.518 .013
030 1.643 .013
031 1.768 .015
032 1.893 .015
033 2.018 .018
034 2.143
035 2.268
036 2.393
037 2.518 .018
038 2.643 .020
039 2.768 .020
040 2.893 .020 .087 .049 .045 .003 .053 .003
041 3.018 .024 .087 .049 .045 .003 .053 .003
042 3.268 .024
043 3.518 .024
044 3.768 .027
045 4.018 .027
046 4.268 .030
047 4.518 .030
048 4.768 .030
049 5.018 .037
050 5.268 .037 .087 .049 .053
102 .077 .005 .129 .053 .086
103 .109
104 .140
105 .171
106 .202
107 .234
108 .265
109 .327
110 .390
111 .452
112 .515 .005
113 .577 .007
114 .640 .009
115 .702 .009
116 .765 .009
117 .831 .010
118 .893
119 .956
120 1.018
121 1.081
122 1.143 .010
123 1.206 .012
124 1.268
125 1.331
126 1.393
127 1.456
128 1.518 .012 .129 .053 .045 .003 .086 .003
Parker Parbak 8-Series Dimensions
Dash
No.
I.D.
(in.)
Tol.
±
R
±.010
T
(Ref.)
A
(in.)
Tol.
±
W
(in.)
Tol.
±
Dash
No.
I.D.
(in.)
Tol.
±
R
±.010
T
(Ref.)
A
(in.)
Tol.
±
W
(in.)
Tol.
±