Cap seal providing low friction and long service life over a wide range of light- to medium-duty bi-directional service applications. The K8E retrofits into standard O-ring grooves designed for no back-up, single, or two back-up rings without modification. The specially designed filled-PTFE cap resists extrusion and twisting of the O-ring under higher pressure.
mineral oil-based fluids, fire-resistant water-based hydraulic fluids including HFA and HFB, biodegradable fluids, vegetable oils, bio-diesels, and most modern hydraulic fluids
Permachem 6150
5,000psi (350bar)
6,000psi (420bar)
-40°F to 400°F (-40°C to 210°C)
13ft/s (4m/s)
same as Permachem 6643
Additional standard materials available: PTFE, filled PTFE®, engineered thermoplastics, high-performance polyurethanes, NBR (Nitrile), FKM, Viton®, HNBR, EPDM, Aflas®, Hytrel®, Silicone, low- and high-temperature, FDA-compliant seal material grades and proprietary specialized Duralast™, Duraloy™, and Permachem™ materials.
Important Note: Maximum values above depend on extrusion gap, clearances, seal material, media, temperatures, pressures, surface speed, dynamic running surface finish and working environment. Seals cannot be operated at their upper ratings at the same time. Pressure ratings can be increased by reducing clearances. For pressure above specified operating pressure, surface speed above 5ft/s (1.3m/s), or for any advice, please contact engineering@ahpseals.com
Size Table (Inch)Standard sizes listed below are preferred sizes for new design applications; however, we offer any other seal size as required. Seals are available for any shaft diameter size in 0.001 inch increments without tooling charges, including Functional Range.
A
Bore Diameter
CS
Cross-section
D
Groove
Diameter
B
Piston
Diameter
Tolerance
L
designed for
no back-up
ring groove
L
designed
for 1 back-up
ring groove
L
designed
for 2 back-up
rings groove
C
R1
Radius
R
Radius
Standard Range
Functional Range
Tolerance
*
D=
B=
D, B
Tolerances +0.005/-0
min.
max.
max.
0.250-0.499"
0.250 - 3.000"
+0.001/-0
0.065
A - 0.130
A - 0.002
-0.001/+0
0.090
0.140
0.205
0.040
0.015
0.005
0.500-0.999"
0.310 - 4.000"
+0.002/-0
0.098
A - 0.196
A - 0.002
-0.002/+0
0.140
0.170
0.240
0.060
0.020
0.005
1.000 - 1.499"
0.430 - 6.000"
+0.002/-0
0.139
A - 0.278
A - 0.003
-0.002/+0
0.190
0.210
0.275
0.080
0.040
0.005
1.500 - 4.999"
0.810 - 10.000"
+0.003/-0
0.203
A - 0.406
A - 0.004
-0.003/+0
0.280
0.310
0.410
0.090
0.050
0.005
5.000 - 20.999"
4.500 - 26.000"
+0.005/-0
0.287
A - 0.574
A - 0.005
-0.004/+0
0.380
0.410
0.540
0.130
0.070
0.005
≥21.000"
consult AHPSeals engineering
*Standard cross-sections(CS) listed and non-standard sizes can be provided for any shaft size up to 63 inches. Surface finish: Shaft (A) plunge ground, zero lead, Ra 8-16µin using elastomer seals, Ra 6-12µin using PTFE seals. Housing (D,L) Ra 32-63µin,shaft material hardness 55-65RC. See Technical Info for more specific information.
Size Table (Metric)Standard sizes listed below are preferred sizes for new design applications; however, we offer any other seal size as required. Seals are available for any shaft diameter size in 0.01 mm increments without tooling charges, including Functional Range.
A
Bore Diameter (mm)
Tol. H8
CS
Cross-section
D
Groove Diameter
Tol. h8
B
Piston Diameter
Tol. h8
L
designed for
no back-up
ring groove
L
designed
for 1 back-up
ring groove
L
designed
for 2 back-up
rings groove
C
R1
R
Standard Range
Functional Range
*
D=
B=
Tolerances +0.12/-0
min.
max.
max.
6.00 - 12.99
6.00 - 75.00
1.65
A - 3.30
A - 0.05
2.50
3.60
5.30
1.00
0.40
0.12
13.00 - 24.99
8.00 - 100.00
2.50
A - 5.00
A - 0.05
3.65
4.35
6.10
1.50
0.60
0.12
25.00 - 37.99
11.00 - 150.00
3.53
A - 7.06
A - 0.07
4.95
5.30
7.00
2.00
1.00
0.12
38.00 - 126.99
25.00 - 250.00
5.16
A - 10.32
A - 0.10
7.50
8.00
10.50
2.30
1.30
0.12
127.00 - 539.99
110.00 - 660.00
7.30
A - 14.60
A - 0.13
9.80
10.40
13.70
3.30
1.80
0.12
≥ 540.00
consult AHPSeals engineering
*Standard cross-sections (CS) listed and non-standard sizes can be provided for any shaft size up to 1600mm. Surface finish: Shaft (A) plunge ground, zero lead, Ra 0.2-0.4µm using elastomer seals, Ra 0.15-30µm using PTFE seals. Housing (D,L) Ra 0.8-1.6µm, shaft material hardness 55-65RC. See Technical Info for more specific information.
