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Association
& Quality
Mil-Spec O-Rings — Defense & Military Seals
O-rings and seals supplied to military specifications for ground, naval, missile, weapons, and aircraft systems. We quote to MIL, AMS, and AS568 callouts in nitrile, fluorocarbon, fluorosilicone, EPDM, silicone, and FFKM — ITAR registered, AS9100 certified, with domestic manufacturing and full lot traceability available.
ITAR Registered
AS9100 · NADCAP
MIL / AMS / QPL Callouts
Domestic Mfg & Traceability
Defense systems we seal
- Ground vehicles — tracked & wheeled, hydraulics
- Naval & marine — surface and subsurface
- Missiles, munitions & weapons systems
- Military aircraft & rotorcraft (see aerospace)
- C5ISR, radar & field electronics enclosures
Defense procurement lives and dies by the callout. A military o-ring is defined not just by its size but by the specification it is built and certified to — the material spec, the size standard, the quality system behind it, and the traceability that proves it. We supply o-rings and seals to military specifications across the services, quote against your MIL, AMS, QPL, or NSN callout, and back the part with the documentation defense programs require. For aircraft and rotorcraft sealing, see our dedicated aerospace o-rings & seals page.
Common military o-ring specifications
The specifications below are the ones most often called out on defense drawings for elastomer o-rings and packings. Send us the spec (and dash number, if you have it) and we will quote to it.
| Specification | Material / scope | Typical use | GOR compound |
|---|---|---|---|
| MIL-DTL-83248 / M83248 | Fluorocarbon (FKM), 75 & 90 durometer | High-temperature, fuel & fluid resistance | FKM → |
| AMS-P-83461 / MIL-P-83461 | Fluorocarbon (FKM) packings, improved performance | Hydraulic & pneumatic dynamic seals | FKM → |
| MIL-P-25732 | Nitrile (NBR), hydrocarbon-resistant | Petroleum hydraulic & fuel, −65°F | NBR → |
| MIL-DTL-25988 | Fluorosilicone (FVMQ) | Fuel + extreme cold (aircraft, missiles) | FVMQ → |
| AMS 7276 / AMS 7280 | Fluorocarbon (FKM) material | High-temp fuel, oil, engine areas | FKM → |
| AMS 7257 | Perfluoroelastomer (FFKM), peroxide-cured | Extreme heat + aggressive chemical service | FFKM → |
| A-A-59588 (was ZZ-R-765) | Silicone (VMQ) rubber | Wide-temp static, environmental seals | VMQ → |
| MS28775 / MS29561 / MS9388 | O-ring size & packing part-number systems | Standard hydraulic & pneumatic dash sizes | AS568 → |
| MIL-G-5514 / SAE AS4716 | Gland (groove) design standards | Design reference for o-ring glands | Groove design → |
Don’t see your callout? We work from any MIL-DTL, MIL-PRF, AMS, QPL, NSN, or controlled-drawing reference. Send it with your RFQ →
Select a military seal by application
Defense material selector
Match the system and the fluid or environment to the compound, then confirm against the program’s material spec.
| System / platform | Fluid or environment | Recommended compound | Material |
|---|---|---|---|
| Ground-vehicle & equipment hydraulics | Petroleum hydraulic fluid (MIL-PRF-5606/-83282) | Nitrile (NBR) or FKM | NBR → |
| Fuel systems (ground, air, missile) | Hydrocarbon fuels + wide temperature | Fluorosilicone (FVMQ) | FVMQ → |
| Engine / high-temperature | Heat, fuel, synthetic lubricants | FKM or FFKM | FKM → |
| Aircraft hydraulics (phosphate ester) | Skydrol / Hyjet | EPDM | EPDM → |
| Weapons, optics, electronics enclosures | Wide temp, ozone, environmental sealing | Silicone (VMQ) or FKM | VMQ → |
| Extreme chemical / high-temp (CBRN, propulsion) | Aggressive media + heat | FFKM (perfluoroelastomer) | FFKM → |
Domestic sourcing, ITAR & traceability
Built for defense supply-chain requirements
Defense programs carry sourcing and documentation requirements that commercial parts cannot meet on their own. We are ITAR registered, operate an AS9100 / ISO 9001 quality system with NADCAP accreditation, and support DFARS and Buy American domestic-content sourcing — with domestic manufacturing available on request for o-rings and seals.
Every order can ship with the documentation your program requires: certificates of conformance (C of C), material certifications, and full lot traceability. We can quote against your NSN, CAGE-referenced drawing, or QPL callout, and support first article inspection (AS9102 FAI) when specified.
Defense applications we support
- Military ground vehicles — tracked and wheeled platform hydraulics, fuel, and powertrain seals
- Naval & marine — surface and subsurface systems, seawater and fuel resistance
- Missiles & munitions — propulsion, actuation, and environmental seals, including extreme-temperature service
- Weapons systems — recoil, hydraulic, and environmental sealing
- Military aircraft & rotorcraft — fuel, hydraulic, and engine seals (see aerospace)
- C5ISR, radar & field electronics — enclosure environmental sealing and EMI/RFI gaskets
- Depot & MRO — sustainment and overhaul seals across legacy and current platforms
Why source mil-spec seals from us
ITAR registered
Registered for controlled defense articles and technical data.
AS9100 & NADCAP
AS9100 / ISO 9001 quality system with NADCAP accreditation.
Domestic & DFARS
Domestic manufacturing available; DFARS and Buy American capable.
Full traceability
C of C, material certs, lot traceability, and FAI on request.
Mil-spec o-ring FAQ
What is a mil-spec o-ring?
A mil-spec o-ring is an o-ring manufactured and certified to a United States military specification that defines its material, properties, dimensions, and quality requirements. Common examples include MIL-DTL-83248 (M83248) for fluorocarbon o-rings, MIL-P-25732 for nitrile hydraulic o-rings, and MIL-DTL-25988 for fluorosilicone. The specification, not just the size, defines the part — so defense drawings call out both a size (often an AS568 or MS dash number) and a material specification.
What does M83248 (MIL-DTL-83248) cover?
MIL-DTL-83248, with part numbers in the M83248 series, covers fluorocarbon (FKM) o-rings for high-temperature and fluid-resistant military applications. It is commonly specified in two hardness classes — roughly 75 and 90 durometer — for static and dynamic sealing where heat and fuel or fluid resistance are required. It is one of the most frequently called-out military o-ring specifications.
Are your mil-spec o-rings ITAR compliant and made in the USA?
We are ITAR registered, which is required to handle controlled defense articles and technical data. We support Buy American and DFARS domestic-content sourcing, and offer domestic manufacturing on request for o-rings and seals. Standard inventory is available for prototyping and lower-criticality needs, and custom or controlled-drawing production can be sourced domestically when the program requires it.
Can you supply o-rings against an NSN or QPL callout?
Yes. We can quote against a National Stock Number (NSN), a CAGE-referenced controlled drawing, a Qualified Products List (QPL) callout, or any MIL/AMS specification. Provide the callout and the size or dash number and we will quote the matching compound and documentation. Certificates of conformance, material certifications, and first article inspection (AS9102) are available when specified.
What documentation can you provide with a defense order?
We can supply certificates of conformance (C of C), material certifications, and full lot traceability with each order, plus first article inspection reports (AS9102 FAI) when required by the program. Note your documentation requirements on the RFQ so they are quoted and included from the start.
Which o-ring material is best for military fuel systems?
Fluorosilicone (FVMQ, per MIL-DTL-25988) is the standard choice where a fuel seal also sees extreme cold, such as aircraft and missile fuel systems, because it combines fuel resistance with low-temperature flexibility. For fuel at high temperature without the extreme-cold requirement, fluorocarbon (FKM) is used. For petroleum hydraulic fluid and fuel in ground equipment, nitrile (NBR, per MIL-P-25732) is the cost-effective workhorse.
Get defense sealing support
Request a quote
Send your MIL/AMS spec, NSN, QPL callout, or controlled drawing. We quote standard and custom mil-spec o-rings with the documentation your program requires.
Request a Quote →Talk to engineering
Need help matching a legacy callout to a current material, or selecting a compound for a new program? Our team can help.
Contact Us →Trade names referenced (e.g. Skydrol and Hyjet for phosphate-ester hydraulic fluids; Viton, the common name for fluorocarbon FKM) identify generic fluid and material chemistries; trademarks are the property of their respective owners and used for identification only. Specification numbers are cited for reference — verify the current revision and superseding documents against your controlled drawing and program requirements before release. Material recommendations are general engineering guidance and are compound- and grade-dependent.
