PartsTable
Technical Data Sheet

M25988/1-212 — O-RING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

M25988/1-212: O-RING.

The O-RING is a the manufacturer industrial component. Key specifications include material: RUBBER SYNTHETIC, hardness_rating: 70.0 SHORE DUROMETER A NOMINAL, center_hole_diameter: 0.875 INCHES NOMINAL IN, elongation_percentage: 125 MAXIMUM, cross-sectional_height: 0.141 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5331-00-288-1954, 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
M25988/1-212
NSN: 5331-00-288-1954
NIINs: 002881954, 011000640
FSC: 5331 — O-ring
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialRUBBER SYNTHETIC
hardness_rating70.0 SHORE DUROMETER A NOMINAL
center_hole_diameter0.875 INCHES NOMINAL IN
elongation_percentage125 MAXIMUM
cross-sectional_height0.141 INCHES NOMINAL IN
NSN5331-00-288-1954
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: M25988/1-212 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
•
CROSS-SECTIONAL HEIGHT: 0.135 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN
•
OUTSIDE DIAMETER: 1.137 INCHES NOMINAL IN
•
HARDNESS RATING: 70.0 SHORE DUROMETER A NOMINAL
•
ELONGATION PERCENTAGE: 125 MAXIMUM
•
CENTER HOLE DIAMETER: 0.849 INCHES MINIMUM AND 0.869 INCHES MAXIMUM IN
•
MATERIAL: RUBBER FLUOROSILICONE CLASS FQ
TECHNICAL CHARACTERISTICS
CROSS-SECTIONAL HEIGHT0.135 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN
OUTSIDE DIAMETER1.137 INCHES NOMINAL IN
HARDNESS RATING70.0 SHORE DUROMETER A NOMINAL
ELONGATION PERCENTAGE125 MAXIMUM
CENTER HOLE DIAMETER0.849 INCHES MINIMUM AND 0.869 INCHES MAXIMUM IN
MATERIALRUBBER FLUOROSILICONE CLASS FQ
SUBSTITUTES & CROSS-REFERENCES 3
9469130212Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
MIL-R-25988/1Reference document
Same NSN cross-reference
Reference document — Secondary reference
MIL-DTL-25988/1Reference document
Same NSN cross-reference
Reference document — Identification reference
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 M25988/1-212?
M25988/1-212 is a O-RING.
What parts can replace M25988/1-212?
There are 3 known substitutes for M25988/1-212: 9469130212, MIL-R-25988/1, MIL-DTL-25988/1. Substitute compatibility should be verified for your specific system.
What is the NSN for M25988/1-212?
M25988/1-212 is cataloged in the U.S. Government catalog under NSN 5331-00-288-1954. 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.