AS568-354
Standard Imperial O-Ring Size
Dimensions
| Inside Diameter (inch) | 3.650 in |
| Cross Section (inch) | 0.139 in |
| Inside Diameter (mm) | 92.71 mm |
| Cross Section (mm) | 3.53 mm |
| Recommended Groove Depth | 0.104 in |
| Theoretical Static Compression | 25.2% (Target: 15-25%) |
Compression Rate Guidance
- Static seals: 15-25% compression is ideal for most applications.
- Dynamic seals: 10-20% compression to reduce friction and wear.
- Groove width should typically be 1.1 to 1.3 times the O-ring cross section.
- Surface finish: 16-32 microin Ra for static, 8-16 microin Ra for dynamic.
Related Resources
Imperial Size Chart
Browse the full AS568 table when you need adjacent dash numbers or series comparisons.
View AS568 chartSize Converter
Convert this imperial size to metric equivalents before choosing ISO or JIS alternatives.
Open size converterCompression Calculator
Check gland squeeze and confirm whether your groove depth matches the target compression range.
Calculate compressionAS568 PDF Download
Request the printable size chart for engineering review, quoting, or shop-floor reference.
Request AS568 PDF