Aerospace Sealing: AMS 7276 FKM O-Rings, NAS 1613 Seals & AS9100 Standards
Author: Site Editor Publish Time: 2026-05-25 Origin:
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Aerospace Sealing Standards Overview
Aerospace sealing components are among the most tightly controlled in the engineering world. Failure of a seal in flight-critical systems can be catastrophic. This guide covers the key standards and qualification requirements.
Key Aerospace Standards
| Standard | Description |
|---|
| AMS 7276 | General specification for FKM O-rings — most referenced in aerospace |
| AMS 3679 | FKM compounds for aerospace fuel system applications |
| NAS 1613 | Revolution seal (radial shaft seal) for aerospace — single and double lip |
| AS9100 | Quality management system for aerospace — supersedes ISO 9001 |
| NADCAP | Accreditation for special process suppliers (heat treatment, plating, testing) |
FKM O-Rings for Aerospace (AMS 7276)
AMS 7276 defines FKM O-rings meeting aerospace requirements for fuel, hydraulic, and pneumatic systems. Key requirements include:
- Temperature range: −26°C to +200°C (special grades to −40°C)
- Fuel resistance: Tested against aviation fuels (JP-4, JP-5, JP-8, Jet A)
- Fluid resistance: Skydrol (phosphate ester hydraulic fluid), mineral-based oils
- Low temperature compression set: Must meet AMS 6276 performance after −26°C conditioning
- Lot traceability: Full material lot traceability mandatory
AMS 7276 FKM Classes
| Class | Temperature Range | Typical Application |
|---|
| Class I | −26°C to +200°C | Standard aerospace applications |
| Class II | −40°C to +200°C | High-altitude, cold start applications |
Aerospace Radial Shaft Seals (NAS 1613)
- Single lip and double lip configurations
- Case hardened and stainless steel materials available
- Internal or external pressure differential capabilities defined by type
- Speed rating (RPM) specified per seal size
- Temperature rating per type classification
Quality System Requirements
To supply aerospace sealing components, manufacturers need:
- AS9100 certification — quality management for aerospace (required by most primes)
- First Article Inspection (AS9102) — comprehensive dimensional and material verification
- PPAP (Production Part Approval Process) — though AS9102 often supersedes automotive PPAP
- Material certifications — from raw material supplier to finished part
- Lot traceability — every O-ring must be traceable to production lot
Sourcing Aerospace Seals from Asia
Most Chinese manufacturers produce industrial-grade FKM — not AMS-grade. To source from China for aerospace:
- Source FKM compounds from approved aerospace material manufacturers (Viton® from Chemours, Solvay Tecnoflon)
- Commission a NADI-capcredited test lab for independent verification
- Request First Article Inspection (FAI) per AS9102 format
- Ensure your supplier’s quality system is documented and auditable
- Consider using an authorized distributor for higher-tier aerospace requirements
Anlintech supplies standard FKM industrial seals. For true aerospace AMS 7276 requirements, we can connect you with qualified supply chain partners or recommend an authorized distributor.
