Guide to Military & Mil-Spec O-Rings and Seals for Defense Applications

Pneu-Draulics supplies O-rings and sealing components for military and aerospace applications that must meet strict material, performance, and documentation requirements. These applications often require compliance with specific military and aerospace standards, including MIL-DTL-25988, AMS 7276, and AMS-P-83461.

Procurement teams must verify material traceability, shelf life, and regulatory compliance when sourcing seals for defense programs. This guide helps procurement teams evaluate material selection, compliance requirements, and supplier capabilities before sourcing.

Common Military Specification Seal Materials and Their Applications

Military and aerospace sealing specifications define not only dimensions but also material performance under specific environmental conditions. Selecting the correct compound depends on temperature range, fluid compatibility, and operating environment.

MIL-DTL-25988 (Fluorosilicone)

MIL-DTL-25988(Fluorosilicone)

Used in fuel and aerospace applications where resistance to jet fuel, oils, and low temperatures is required

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AMS 7276 (FKM)

AMS 7276(FKM)

Common in high-temperature environments requiring resistance to aggressive chemicals and thermal degradation

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AMS-P-83461 (Nitrile)

AMS-P-83461(Nitrile)

Used in hydraulic systems where oil resistance and mechanical durability are required

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Key Considerations When Sourcing Mil-Spec Seals

Selecting seals for military and aerospace applications requires more than matching a part number. Procurement teams should evaluate the following when sourcing Mil-Spec seals:

Material compliance with MIL-SPEC or AMS requirements

DFARS and ITAR considerations, depending on the application

Traceability and documentation availability

Shelf life and storage conditions (AS5316)

Packaging and labeling requirements for government contracts

Authorized Distribution of DFARS-Compliant Parker Hannifin Seals

Pneu-Draulics is an authorized distributor of Parker Hannifin sealing solutions, including DFARS-compliant components for military and aerospace applications. These products are designed for environments requiring chemical resistance, thermal stability, and long service life.

Available product types include O-rings, molded seals, Gask-O-Seals®, and rubber-bonded components used in demanding operating conditions.

Authorized Distribution of DFARS-Compliant Parker Hannifin Seals
Supporting Procurement

Supporting Procurement With CAGE Code 8V217 and Rapid Fulfillment

Pneu-Draulics operates under CAGE Code 8V217 and supports procurement requirements for military and government contracts. The team works with OEMs, MRO providers, and procurement specialists to source DFARS-compliant sealing components and documentation required for contract fulfillment.

Operating under CAGE Code 8V217 allows Pneu-Draulics to participate directly in government procurement systems and support contract-based sourcing requirements. This simplifies vendor qualification and purchasing workflows for defense buyers.

Pneu-Draulics supports sourcing of DFARS-compliant seals and operates as an ITAR-compliant seal manufacturer for regulated applications.

Navigating Standards: AS568, NAS1611, and MS28775 Requirements

Several standards govern the sizing, material, and performance requirements for military and aerospace sealing components.

AS568 O-Rings

AS568 O-Rings

AS568 defines standard O-ring sizes used in aerospace and military applications. The standard specifies cross-sectional dimensions, tolerances, and size-identification codes for interchangeability.

Key parameters include:

  • Dash numbers
  • Dimensional tolerances
  • Inside diameter and cross-section
  • Material and hardness
NAS1611 Aerospace Rings

NAS1611 Aerospace Rings

NAS1611 O-rings are used in aerospace fuel and hydraulic systems and are typically manufactured from ethylene propylene (EPM/EPDM) materials. These seals are commonly specified in applications where exposure to fuel, outdoor conditions, and temperature variation requires stable sealing performance over time.

MS28775 Military Seals

MS28775 Military Seals

MS28775 O-rings are used in aerospace hydraulic systems and are designed to maintain sealing performance under pressure and temperature variation. These seals are typically manufactured from nitrile rubber compounds that meet military material specifications. They are typically selected for hydraulic systems that require consistent sealing under pressure and compatibility with petroleum-based fluids.

AGE CONTROL AND SHELF LIFE (AS5316) FOR MILITARY INVENTORY

Proper storage and age control are critical for elastomer seals used in military applications. SAE AS5316 defines shelf life and storage requirements based on material type.

SAE AS5316 is an Aerospace Standard that defines shelf life and storage requirements for elastomer seals governing the storage, packaging, and age control for aerospace and military applications. The standard establishes the maximum allowable shelf life for military inventory, based on the polymer type, starting from the last day of the quarter in which the seal was manufactured.

Military

The shelf life of elastomeric materials used in the production of O-rings for military purposes includes:

  • 3 years: SBR
  • 5 years: AU
  • 15 years: ACM, AEM, CR, ECO, HNBR, NBR
  • Unlimited: EP, FEPM, FFKM, FKM, FVMQ, IIR, VMQ

These limits are based on testing and examination of rubber seals with extensive shelf age. The recommendations align with the practical and theoretical expectations that materials with an unlimited shelf life are physically stable and do not exhibit a chemical tendency to degrade under atmospheric exposure.

Source DFARS-Compliant Seals with Verified Documentation

Sourcing seals for military and aerospace applications requires alignment with material specifications, storage standards, and documentation requirements. Procurement teams must verify compliance with MIL-SPEC, DFARS, and traceability standards before approving components for use.

Pneu-Draulics supports these requirements through design consultation, sourcing, and supply of compliant sealing components. Contact the team to review specifications or request a quote for DFARS-compliant seals.

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