Welcome to our oil seal store. Huge amount of different dimensions and materials are on stock!! Don´t hasitate to contact us. We also have o-ring store, bearing store,chain store,
hydraulic and pneumatic seals store, belt store, etc - we can send together. Most of oil seals are on stock, so we are usually shipping within 2 bussiness days.
Longer handling time 10-20 days occures just on sold out items.
We can also use UPS express shipping. Shipping rates are: UPS to USA 30USD, UPS to Europe, U.K, Germany, France 20USD,
UPS to N.a S.America, Canada, Mexico, Brazil, Asia, China, Japan, Australia 50USD
K21 is a single acting piston - rod seal and designed to
have symmetrical lips in order to be used both for rod and piston applications.
PRODUCT ADVANTAGES
• Superior static and dynamic sealing effect
• Wide range of dimensions
• Easy assembly into closed grooves
• Simple groove design
• Economical sealing solution
APPLICATION
Construction machinery , fork-lift trucks , injection
moulding machines , agricultural machinery , loading platforms and standard
cylinders.
MATERIAL CODE
NBR 90 SHORE A NB9001
PU 92 SHORE A PU9201
OPERATING CONDITIONS
NBR
MEDIA Mineral oils(DIN
51524) HFA and HFB HFC
TEMPERATURE -30°C
+105°C +5°C +60°C -30°C +60°C
PRESSURE ≤150
Bar ≤150 Bar ≤150 Bar
SPEED ≤0.5 m/sn ≤0.5 m/sn ≤0.5 m/sn
PU
MEDIA Mineral oils(DIN
51524) HFA and HFB HFC
TEMPERATURE -30°C
+100°C +5°C +50°C -30°C +40°C
PRESSURE ≤400
Bar ≤400 Bar ≤400 Bar
SPEED ≤0.5 m/sn ≤0.5 m/sn ≤0.5 m/sn
Note: The above data are maximum values and cannot be used
at the same time.
SURFACE ROUGHNESS Ra Rmax
Sliding Surface ØD-Ød ≤0.4
μm ≤3.2 μm
Groove Base ØDb-Ødp ≤1.6
μm ≤10 μm
Groove Flanks B ≤3.2
μm ≤16 μm
Note: It is recommended to have 50% to 90% of the working
surface material contact area value.
INSTALLATION
Easily assembled into closed grooves according to the
minimum diameter values that are given in the below table. Open grooves or
special assembly tools should be used for the values that are outside this
table. It is very important that the assembly tools must be of soft material
and have no sharp edges. Before installation the wiper must be oiled with
system oil.
MINUMUM DIAMETER VALUES FOR CLOSED TYPE OF GROOVES
(D-d)/2 (mm) 4 5 6 7.7 10 12.5 15
dmin (mm) 25 30 40 50 80 100 105
NOTES For special applications that require high
temperatures , K21 can be produced in FKM material. The permissible sealing gap
values of K21 piston -rod seal is given in the below table.
PERMISSIBLE SEALING GAP
NBR Smax (mm)
t=(D-d)/2 50
Bar 100 Bar 150 Bar
t≤5 0.40 0.20 0.10
t>5 0.45 0.25 0.15
PU Smax (mm)
t=(D-d)/2 150
Bar 250 Bar 400 Bar
t≤5 0.30 0.20 0.15
t>5 0.35 0.25 0.20
Note: The largest sealing gap value occurring on the
non-pressurized side of the seal does have a vital importance for the function
of the seal and in this respect it is quite important to use the S value lower
than the above indicated numbers.