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Technical Data Sheet
MS27990-4C ✓ Verified by PartsTable
· ORING SEAL
WHAT YOU NEED TO KNOW
Material determines chemical compatibility Standard durometer is 70 Shore A
Wrong material = catastrophic seal failure
PRODUCT OVERVIEW

The ROD,STRAIGHT,HEADLESS is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING OVERALL, overall_length: 84.000 INCHES NOMINAL IN, overall_diameter: 0.125 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-136-2766, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
MS27990-4C
NSN: 5340-00-136-2766
FSC: 5340
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
overall_length84.000 INCHES NOMINAL IN
overall_diameter0.125 INCHES NOMINAL IN
NSN5340-00-136-2766
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: MS27990-4C MFR: OEM ⚠ VERIFY BEFORE ORDERING Wrong material = failure. Viton for oil/fuel, EPDM for water/steam, Buna-N for general purpose, Silicone for food-grade. Chemical incompatibility causes swelling, brittleness, or rapid degradation ✓ BROKER TIP Durometer (hardness) affects sealing pressure tolerance. Higher Shore A = harder = higher pressure. Standard durometer is 70A — verify if application requires different hardness PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
OVERALL DIAMETER: 0.125 INCHES NOMINAL IN
MATERIAL: STEEL CORROSION RESISTING OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
OVERALL LENGTH84.000 INCHES NOMINAL IN
OVERALL DIAMETER0.125 INCHES NOMINAL IN
MATERIALSTEEL CORROSION RESISTING OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 23
A-A-55592Upgraded Successor
successor cross-reference
successor
AA55592-12AUpgraded Successor
successor cross-reference
successor
AA55592-9CInterchangeable
interchangeable cross-reference
interchangeable
MS35825-9CInterchangeable
interchangeable cross-reference
interchangeable
MS35825-10CInterchangeable
interchangeable cross-reference
interchangeable
12664Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS27990-4C?
MS27990-4C is a ROD,STRAIGHT,HEADLESS.
What parts can replace MS27990-4C?
There are 23 known substitutes for MS27990-4C: A-A-55592, AA55592-12A, AA55592-9C and 20 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MS27990-4C?
MS27990-4C is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-136-2766. This indicates validated use in U.S. government and defense supply chains.
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