Parker Hannifin Corporation
Tube Fittings Division
Columbus, Ohio
http://www.parker.com/tfd
N3
4300
Catalog
O-Rings and Seals
Dimensions for reference only, subject to change.
O-Ring Material Selection
Standard O-rings supplied with Parker tube fittings and adapt-
ers are 90 durometer hard nitrile (Buna-N). These O-rings are
well suited for most industrial hydraulic and pneumatic systems.
They have high extrusion resistance making them suitable for
very highpressure static applications.Optional high temperature
fluorocarbon, Parker compound #V0894, is also available for
higher temperature specifications.
O-rings for other than normal hydraulicmedia or higher tempera-
ture applications can be selected from the following chart. The
Table U6 — O-Ring Selection
1)
These Parker “Chromassure” color assurance O-rings are available from the Parker Hannifin O-Ring Division. They help
eliminate assembly errors, reduce warranty costs and liability risks, and assure safety in aftermarket business.
2)
Formerly SAE Type I.
3)
Formerly SAE Type II.
4)
Formerly SAE Type III.
5) “
FKM” is the ASTM designation for fluorocarbon. Its ISO designation is “FPM”.
Note: Use 90 durometer hard O-rings for applications with 1500 psi or higher pressures.
chart should be used only as a general guide. Before making
final selection for a given application, it is recommended that
appropriate tests be conducted to assure compatibility with the
fluid, temperature, pressureandother environmental conditions.
For fluids not shown in the chart, please contact the Tube
Fittings Division.
Polymer
(
Abbreviation)
Recommended for
Not Recommended
for
Parker
Compound
No.
Color
SAE
J515
Type
Hardness
Shore "A"
Temperature
Range (°F)
Comments
Nitrile-
Butadiene
(
NBR)
Petroleum base oils
and fluids, mineral
oils, ethylene glycol
base fluids, silicone
and di-ester base
lubricants, air, water
under 150°F, and
natural gas.
Phosphate ester
base hydraulic fluids,
automotive brake
fluids, strong acids,
ozone, freons, ke-
tones, halogenated
hydrocarbons, and
methanol.
NBR Black CH
2)
90 -30
° to 250° F Standard from stock
N0674 Black –
70 -30
° to 250° F
N0103 Black –
70 -65
° to 225° F
N1059 Black CH
2)
90 -30
° to 275° F Low compression set
N0507 Black –
90 -65
° to 180° F Orange identification dot
N0304 Black –
75 -65
° to 225° F
N0508 Black –
75 -35
° to 250° F Meets FDA requirements
for food products
N0756 Black –
75 -65
° to 275° F CNG applications. Standard
from stock
Ethylene-
Propylene
(
EPDM)
Phosphate ester
base hydraulic fluids,
hot water, steam to
400
°F, silicone oils
and greases, dilute
acids and alkalis,
ketones, alcohols
and automotive
brake fluids.
Petroleum base oils
and di-ester base
lubricants.
E0540 Black CA
3)
80 -65
° to 275° F
E0893 Purple
1)
CA
3)
80 -65
° to 275° F
E0962 Black –
90 -65
° to 275° F CO2 climate control systems.
H2 fuel cells.
Neoprene (CR)
Refrigerants (freons,
ammonia), high
aniline point petro-
leum oils, mild acids,
and silicate ester
lubricants.
Phosphate ester
fluids and ketones.
C0873 Black –
70 -45
° to 250° F
C0944 Red
1)
–
70 -45
° to 250° F
Fluorocarbon
(
FKM
5
or FPM)
Petroleum base oils
and fluids, some
phosphate ester
base fluids, silicone
and silicate ester
base lubricants,
di-ester base
lubricants, acids
and halogenated
hydrocarbons.
Ketones, skydrol
fluids, amines
(
VDMH), anhydrous
ammonia, low
molecular weight
esters and ethers,
and hot hydroflu-
oric or chlorosulfonic
acids.
V0747 Black –
75 -15
° to 400° F
V0884 Brown
1)
–
75 -15
° to 400° F
V0894 Brown
1)
HK
4)
90 -15
° to 400° F Standard from stock.
Silicone (Si)
Dry heat (air to
400
°F) and high
aniline point oils.
Most petroleum
fluids, ketones, water
and steam.
S0604 Rust
1)
–
70 -65
° to 450° F
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