PartsTable
Technical Data Sheet

MIL-R-25988/4 — O-RING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

MIL-R-25988/4: O-RING.

The O-RING is a the manufacturer industrial component. Key specifications include material: RUBBER FLUOROSILICONE CLASS FQ, center_hole_diameter: 3.581 INCHES MINIMUM AND 3.637 INCHES MAXIMUM IN, cross-sectional_height: 0.135 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5331-01-005-3218, 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
MIL-R-25988/4
NSN: 5331-01-005-3218
NIINs: 010053218, 010062124, 010063934, 010255805, 010542591, 010584014, 010883432, 010887967, 010922039, 011187702, 011292009, 011292010, 011292011, 011292012, 011292013, 011292014, 011292015, 011292016, 011292017, 011292018, 011292021, 011292022, 011293136, 011293137, 011293138, 011293139, 011293142, 011293145, 011293159, 011332207, 011411818, 011438087, 011554203, 011560092, 011560093, 011690653, 011692889, 011692891, 011708840, 011753482, 011764809, 011893622, 011898268, 011902224, 011912958, 011948661, 011948662, 011948663, 011948664, 011948665, 012006287, 012006288, 012006289, 012006290, 012006291, 012006292, 012006293, 012006294, 012006295, 012006296, 012006297, 012043047, 012068069, 012102834, 012102835, 012102836, 012142703, 012150122, 012165706, 012176839, 012434495, 012594459, 012677409, 012685776, 012722584, 012722585, 013375806, 013608999, 013856054, 014412662, 014844416, 014844419, 014958927, 014959742, 015206700, 015904267
FSC: 5331 — O-ring
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialRUBBER FLUOROSILICONE CLASS FQ
center_hole_diameter3.581 INCHES MINIMUM AND 3.637 INCHES MAXIMUM IN
cross-sectional_height0.135 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN
NSN5331-01-005-3218
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: MIL-R-25988/4 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
•
TEMP RATING: -90.0 FAHRENHEIT AND 350.0 FAHRENHEIT DEGF
•
CROSS-SECTIONAL HEIGHT: 0.100 INCHES MINIMUM AND 0.106 INCHES MAXIMUM IN
•
OUTSIDE DIAMETER: 1.302 INCHES MINIMUM AND 1.334 INCHES MAXIMUM IN
•
HARDNESS RATING: 80.0 SHORE DUROMETER A NOMINAL
•
ELONGATION PERCENTAGE: 125 MAXIMUM
•
CENTER HOLE DIAMETER: 1.102 INCHES MINIMUM AND 1.122 INCHES MAXIMUM IN
•
MATERIAL: RUBBER FLUOROCARBON CLASS FPM
TECHNICAL CHARACTERISTICS
TEMP RATING-90.0 FAHRENHEIT AND 350.0 FAHRENHEIT DEGF
CROSS-SECTIONAL HEIGHT0.100 INCHES MINIMUM AND 0.106 INCHES MAXIMUM IN
OUTSIDE DIAMETER1.302 INCHES MINIMUM AND 1.334 INCHES MAXIMUM IN
HARDNESS RATING80.0 SHORE DUROMETER A NOMINAL
ELONGATION PERCENTAGE125 MAXIMUM
CENTER HOLE DIAMETER1.102 INCHES MINIMUM AND 1.122 INCHES MAXIMUM IN
MATERIALRUBBER FLUOROCARBON CLASS FPM
OTHER ITEMS IN FSC 5331 — O-ring
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5331-00-001-1971 5331-00-001-1979 5331-00-001-3904 5331-00-001-3905 5331-00-001-3906 5331-00-001-3908 5331-00-001-3923 5331-00-001-3924
SUBSTITUTES & CROSS-REFERENCES 8
2-122 L806-80Reference document
Same NSN cross-reference
Reference document — Secondary reference
L1218 2-122Reference document
Same NSN cross-reference
Reference document — Secondary reference
A-122TH1058Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
MIL-DTL-25988/4Reference document
Same NSN cross-reference
Reference document — Identification reference
M25988/4-122Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
122-11648Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is MIL-R-25988/4?
MIL-R-25988/4 is a O-RING.
What parts can replace MIL-R-25988/4?
There are 8 known substitutes for MIL-R-25988/4: 2-122 L806-80, L1218 2-122, A-122TH1058 and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MIL-R-25988/4?
MIL-R-25988/4 is cataloged in the U.S. Government catalog under NSN 5331-01-005-3218. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.