O-Ring Specifications
Complete dimensional data and specifications for O-rings including tolerances, groove design requirements, and material options.
Dimensions
📏 Imperial Measurements
| AS568 Size: | |
| Inner Diameter (ID): | " |
| Cross-Section (CS): | " |
| Outer Diameter (OD): | " |
| ID Tolerance: | " |
| CS Tolerance: | " |
📐 Metric Measurements
| AS568 Size: | |
| Inner Diameter (ID): | mm |
| Cross-Section (CS): | mm |
| Outer Diameter (OD): | mm |
| ID Tolerance: | mm |
| CS Tolerance: | mm |
Cross Reference Information
Equivalent Part Numbers
| Manufacturer |
Part Number |
Material Code |
Hardness |
Notes |
| Parker |
|
Various |
70-90A |
Most common equivalent |
| National |
|
Various |
70-90A |
Oil seal manufacturer |
| SKF |
|
Various |
80-90A |
Bearing application focus |
| Apple Rubber |
|
Various |
70-90A |
Custom compounds available |
Groove Design Specifications
🔧 Static Seal Groove
| Groove Width: | " |
| Groove Depth: | " |
| Compression: | % |
| Stretch: | % |
| Corner Radius: | " |
⚙️ Dynamic Seal Groove
| Groove Width: | " |
| Groove Depth: | " |
| Compression: | % |
| Stretch: | % |
| Surface Finish: | Ra |
Complete Groove Design Guide
Available Materials for
Material Options and Pricing for
| Material |
Hardness |
Color Options |
Stock Status |
Price Range (1-99 pcs) |
Volume Pricing (100+) |
| Nitrile (NBR) |
70A, 80A, 90A |
Black, Brown |
✅ In Stock |
$ |
20-30% discount |
| Viton (FKM) |
75A, 90A |
Black, Brown, Green |
✅ In Stock |
$ |
25-35% discount |
| EPDM |
70A, 80A |
Black, White, Red |
✅ In Stock |
$ |
20-30% discount |
| Silicone |
70A, 80A |
Clear, White, Red |
🔶 2-3 days |
$ |
25-35% discount |
| HNBR |
80A, 90A |
Black |
🔶 7-10 days |
$ |
30-40% discount |
Legend: ✅ In Stock | 🔶 Special Order | Prices shown per piece
Pressure Ratings by Material
Maximum Pressure Ratings for by Material and Hardness
| Material |
70A Hardness |
80A Hardness |
90A Hardness |
Backup Ring Required |
| NBR |
|
|
|
Above 1,500 PSI |
| FKM |
N/A |
|
|
Above 2,000 PSI |
| EPDM |
|
|
N/A |
Above 1,200 PSI |
| HNBR |
N/A |
|
|
Above 3,000 PSI |
* Pressure ratings based on static sealing at room temperature. Dynamic applications and elevated temperatures may require lower pressures.
Installation Guidelines for
🔧 Pre-Installation
- Inspect O-ring for cuts, nicks, or contamination
- Clean groove thoroughly with lint-free cloth
- Check groove dimensions against specifications
- Verify proper material selection for application
- Apply compatible lubricant if specified
⚙️ Installation Process
- Handle O-ring carefully to avoid stretching
- Install without twisting or rolling
- Ensure even compression in groove
- Check for proper seating before assembly
- Avoid sharp edges during installation
Common Issues with
Troubleshooting Guide for O-Rings
| Problem |
Possible Cause |
Solution |
Prevention |
| Leakage at low pressure |
Insufficient compression |
Check groove depth, use softer durometer |
Verify groove design calculations |
| Extrusion damage |
Excessive clearance or pressure |
Reduce clearance, add backup ring |
Use harder durometer for high pressure |
| Installation damage |
Sharp edges, improper handling |
Chamfer edges, use installation tools |
Design proper lead-in chamfers |
| Premature aging |
Wrong material, high temperature |
Select temperature-appropriate material |
Review application temperature requirements |
Quality Standards & Testing
📋 Dimensional Standards
- AS568A specifications
- ISO 3601-1 compliance
- ±0.005" ID tolerance
- ±0.003" CS tolerance
🧪 Material Testing
- ASTM D2000 automotive
- ASTM D1414 compression set
- ASTM D412 tensile properties
- ASTM D471 fluid resistance
✅ Certifications
- RoHS compliant materials
- REACH regulation compliant
- FDA CFR 177.2600 (food grade)
- USP Class VI (medical)