KASTAS BACK-UP RING K81
K81 is a back-up ring designed to reduce the permissible sealing gap of the O-rings both for static and dynamic applications.
PRODUCT ADVANTAGES
• Able to work in high pressures
• Easy assembly
• Able to work in hard conditions
• Wide range of dimensions
• Used for rod and piston
APPLICATION
All types of hydraulic cylinders, injection moulding machines,mining equipment, marine hydraulics, loading platforms, cranes and heavy duty applications.
| MATERIAL | CODE |
| TPE | TP5501 |
| OPERATING CONDITIONS | |||
| MEDIA | Mineral oils (DIN 51524) | HFA and HFB | HFC |
| TEMPERATURE | -40°C +120°C | +5°C +60°C | -30°C +60°C |
| PRESSURE | ≤500 Bar | ≤500 Bar | ≤500 Bar |
| SPEED | ≤1.0 m/sec | ≤1.0 m/sec | ≤1.0 m/sec |
| SURFACE ROUGHNESS | Ra | Rmax |
| Sliding Surface | ≤0.3 μm | ≤3 μm |
| Groove Base | ≤1.8 μm | ≤10 μm |
| Groove Flanks | ≤3 μm | ≤16 μm |
INSTALLATION
Easily assembled into the housing by hand. K81 back-up ring is in non split form. In case of a difficulty during installation the back-up ring can be cut carefully with 30° angle and assembled afterwards.It is very important that the assembly tools must be of soft material and have no sharp edges. Before installation the back-up ring must be oiled with system oil.
NOTES
K81 back-up ring is safely used with 0.20 mm permissible sealing gap up to 500 bar. For special applications PTFE back-up ring is produced on special requests.
| KASTAŞ NO | d(f7)/dp(h9) | Db(H9)/D(H8) | a | B1(-0/+0.2) | B2(-0/+0.2) | O-Ring d2 |
| K81-014 | 14 | 18 | 1.3 | 4.7 | 6 | 2.62 |
| K81-020 | 20 | 25 | 1.3 | 5.2 | 6.5 | 3 |
| K81-025/1 | 25 | 30 | 1.3 | 5.2 | 6.5 | 3 |
| K81-027 | 27 | 32 | 1.3 | 5.2 | 6.5 | 3 |
| K81-035 | 35 | 40 | 1.3 | 5.2 | 6.5 | 3 |
| K81-035/1 | 35.15 | 41 | 1.45 | 5.95 | 7.4 | 3.53 |
| K81-036/1 | 36 | 40 | 1.8 | 5.2 | 7 | 2.62 |
| K81-038 | 38 | 43 | 1.3 | 5.2 | 6.5 | 3 |
| K81-040 | 40 | 45 | 1.3 | 5.2 | 6.5 | 3 |
| K81-043 | 43 | 48 | 1.3 | 5.2 | 6.5 | 3 |
| K81-045 | 45 | 50 | 1.3 | 5.2 | 6.5 | 3 |
| K81-045/1 | 45.15 | 51 | 1.45 | 5.95 | 7.4 | 3.53 |
| K81-049 | 49.3 | 55 | 1.3 | 5.8 | 7.1 | 3.53 |
| K81-050 | 50 | 55 | 1.3 | 5.2 | 6.5 | 3 |
| K81-050/2 | 50 | 60 | 1.7 | 9.1 | 10.8 | 5.7 |
| K81-052 | 52 | 60 | 1.9 | 8.4 | 10.3 | 5 |
| K81-053/1 | 53 | 63 | 1.7 | 9.1 | 10.8 | 5.7 |
| K81-055 | 55 | 63 | 1.9 | 8.4 | 10.3 | 5 |
| K81-055/2 | 55.15 | 61 | 1.45 | 5.95 | 7.4 | 3.53 |
| K81-058 | 58 | 63 | 1.3 | 5.2 | 6.5 | 3 |
| K81-060/1 | 60 | 70 | 1.7 | 9.1 | 10.8 | 5.7 |
| K81-060/2 | 60 | 65 | 1.3 | 5.2 | 6.5 | 3 |
| K81-062 | 62 | 70 | 1.9 | 8.4 | 10.3 | 5 |
| K81-062/1 | 62.2 | 68 | 1.3 | 5.8 | 7.1 | 3.53 |
| K81-062/2 | 62.15 | 71 | 1.7 | 8.6 | 10.3 | 5.33 |
| K81-064 | 64 | 73.3 | 1.5 | 8.9 | 10.4 | 5.7 |
| K81-065 | 65 | 70 | 1.3 | 5.2 | 6.5 | 3 |
| K81-065/1 | 65 | 75 | 1.7 | 9.1 | 10.8 | 5.7 |
| K81-070 | 70 | 75 | 1.3 | 5.2 | 6.5 | 3 |
| K81-070/1 | 70 | 80 | 1.7 | 9.1 | 10.8 | 5.7 |
| K81-072 | 72 | 80 | 1.9 | 8.4 | 10.3 | 5 |
| K81-072/1 | 72.15 | 81 | 1.7 | 8.6 | 10.3 | 5.33 |
| K81-075 | 75 | 80 | 1.3 | 5.2 | 6.5 | 3 |
| K81-075/3 | 75 | 85 | 1.9 | 9.3 | 11.2 | 5.7 |
| K81-079 | 79.8 | 89.1 | 1.5 | 8.9 | 10.4 | 5.7 |
| K81-080 | 80 | 85 | 1.3 | 5.2 | 6.5 | 3 |
| K81-082 | 82 | 90 | 1.9 | 8.4 | 10.3 | 5 |
| K81-082/1 | 82.15 | 91 | 1.7 | 8.6 | 10.3 | 5.33 |
| K81-084 | 84.3 | 90 | 1.3 | 5.8 | 7.1 | 3.53 |
| K81-085 | 85 | 90 | 1.3 | 5.2 | 6.5 | 3 |
| K81-090 | 90 | 95 | 1.3 | 5.2 | 6.5 | 3 |
| K81-090/1 | 90 | 100 | 1.7 | 9.1 | 10.8 | 5.7 |
| K81-092 | 92 | 100 | 1.9 | 8.4 | 10.3 | 5 |
| K81-100 | 100 | 110 | 1.7 | 9.1 | 10.8 | 5.7 |
| K81-100/1 | 100 | 108.2 | 1.9 | 8.4 | 10.3 | 5 |
| K81-100/2 | 100.6 | 110 | 1.7 | 9.1 | 10.8 | 5.7 |
| K81-102 | 102 | 110 | 1.9 | 8.4 | 10.3 | 5 |
| K81-105 | 105 | 110 | 1.3 | 5.2 | 6.5 | 3 |
| K81-107 | 107 | 115 | 1.9 | 8.4 | 10.3 | 5 |
| K81-109 | 109 | 118.3 | 1.9 | 9.27 | 11.14 | 5.7 |
| K81-110 | 110 | 115 | 1.3 | 5.2 | 6.5 | 3 |
| K81-110/1 | 110 | 120 | 1.7 | 9.1 | 10.8 | 5.7 |
| K81-110/2 | 110 | 120 | 1.9 | 9.3 | 11.2 | 5.7 |
| K81-112 | 112 | 120 | 1.9 | 8.4 | 10.3 | 5 |
| K81-115 | 115 | 125 | 1.7 | 9.1 | 10.8 | 5.7 |
| K81-115/1 | 115 | 124.3 | 1.5 | 8.9 | 10.4 | 5.7 |
| K81-115/2 | 115 | 125 | 1.9 | 9.3 | 11.2 | 5.7 |
| K81-117 | 117 | 125 | 1.9 | 8.4 | 10.3 | 5 |
| K81-118 | 118.2 | 127.5 | 1.5 | 8.9 | 10.4 | 5.7 |
| K81-120 | 120 | 125 | 1.3 | 5.2 | 6.5 | 3 |
| K81-120/1 | 120 | 130 | 1.7 | 9.1 | 10.8 | 5.7 |
| K81-122 | 122 | 130 | 1.9 | 8.4 | 10.3 | 5 |
| K81-125 | 125 | 135 | 1.9 | 9.3 | 11.2 | 5.7 |
| K81-130 | 130 | 140 | 1.7 | 9.1 | 10.8 | 5.7 |
| K81-130/1 | 130.7 | 140 | 1.9 | 9.3 | 11.2 | 5.7 |
| K81-138 | 138.4 | 150 | 2.5 | 11.6 | 14.1 | 6.99 |
| K81-140 | 140 | 150 | 1.7 | 9.1 | 10.8 | 5.7 |
| K81-145 | 145 | 160 | 2.1 | 13 | 15.1 | 8.4 |
| K81-150 | 150.7 | 160 | 1.9 | 9.3 | 11.2 | 5.7 |
| K81-150/1 | 150 | 160 | 1.7 | 9.1 | 10.8 | 5.7 |
| K81-151 | 151 | 160 | 1.9 | 8.8 | 10.7 | 5.33 |
| K81-153 | 153.3 | 165 | 2 | 11.1 | 13.1 | 6.99 |
| K81-155 | 155 | 170 | 2.1 | 13 | 15.1 | 8.4 |
| K81-155/1 | 155 | 165 | 1.7 | 9.1 | 10.8 | 5.7 |
| K81-155/2 | 155 | 165 | 1.9 | 9.3 | 11.2 | 5.7 |
| K81-158 | 158.4 | 170 | 2.5 | 11.6 | 14.1 | 6.99 |
| K81-161 | 161.8 | 170 | 1.9 | 8.4 | 10.3 | 5 |
| K81-165 | 165 | 180 | 2.1 | 13 | 15.1 | 8.4 |
| K81-170 | 170.7 | 180 | 1.9 | 9.3 | 11.2 | 5.7 |
| K81-175 | 175 | 190 | 2.1 | 13 | 15.1 | 8.4 |
| K81-181 | 181.8 | 190 | 1.9 | 8.4 | 10.3 | 5 |
| K81-185 | 185 | 200 | 2.1 | 13 | 15.1 | 8.4 |
| K81-188 | 188.4 | 200 | 2.5 | 11.6 | 14.1 | 6.99 |
| K81-190 | 190.7 | 200 | 1.9 | 9.3 | 11.2 | 5.7 |
| K81-192 | 192.6 | 202 | 1.9 | 9.3 | 11.2 | 5.7 |
| K81-198 | 198.4 | 210 | 2.5 | 11.6 | 14.1 | 6.99 |
| K81-201 | 201.8 | 210 | 1.9 | 8.4 | 10.3 | 5 |
| K81-205 | 205.7 | 215 | 1.9 | 9.3 | 11.2 | 5.7 |
| K81-210 | 210.7 | 220 | 1.9 | 9.3 | 11.2 | 5.7 |
| K81-216 | 216.6 | 225.8 | 1.9 | 8.8 | 10.7 | 5.33 |
| K81-220 | 220.7 | 230 | 1.9 | 9.3 | 11.2 | 5.7 |
| K81-220/1 | 220.3 | 232 | 2 | 11.1 | 13.1 | 6.99 |
| K81-225 | 225 | 240 | 2.1 | 13 | 15.1 | 8.4 |
| K81-228 | 228.4 | 240 | 2.5 | 11.6 | 14.1 | 6.99 |
| K81-235 | 235 | 250 | 2.1 | 13 | 15.1 | 8.4 |
| K81-240 | 240.7 | 250 | 1.9 | 9.3 | 11.2 | 5.7 |
| K81-241 | 241.8 | 250 | 1.9 | 8.4 | 10.3 | 5 |
| K81-245 | 245 | 260 | 2.1 | 13 | 15.1 | 8.4 |
| K81-245/1 | 245.7 | 255 | 1.9 | 9.3 | 11.2 | 5.7 |
| K81-260 | 260.7 | 270 | 1.9 | 9.3 | 11.2 | 5.7 |
| K81-290 | 290.7 | 300 | 1.9 | 9.3 | 11.2 | 5.7 |
| K81-295 | 295.7 | 305 | 1.9 | 9.3 | 11.2 | 5.7 |