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Technical Data Sheet

MIL-R-25988/3 — O-RING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

MIL-R-25988/3: O-RING.

The O-RING is a the manufacturer industrial component. Key specifications include material: RUBBER FLUOROSILICONE CLASS FQ, hardness_rating: 60.0 SHORE DUROMETER A NOMINAL, center_hole_diameter: 4.952 INCHES MINIMUM AND 5.022 INCHES MAXIMUM IN, cross-sectional_height: 0.100 INCHES MINIMUM AND 0.106 INCHES MAXIMUM IN, material_document_and_classification: MIL-R-25988/3 MIL SPEC SINGLE MATERIAL RESPONSE. This part is cataloged in the U.S.

Government catalog under NSN 5331-00-185-1735, 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-25988/3
NSN: 5331-00-185-1735
NIINs: 001851735, 003048713, 003048714, 003166502, 003219046, 003231702, 006321723, 009738161, 010046433, 010069488, 010310789, 010419661, 010431418, 010661919, 010661920, 010760364, 010832340, 010844744, 010861129, 010879756, 010906792, 010908488, 010953709, 010969533, 010969535, 010982928, 010982929, 010982930, 010982931, 010982932, 010982933, 010982934, 010982935, 010982936, 011012774, 011044898, 011063475, 011083464, 011092475, 011128636, 011132085, 011134763, 011139581, 011144936, 011154757, 011180730, 011188626, 011188627, 011190953, 011191627, 011194401, 011201450, 011292001, 011292003, 011292004, 011292006, 011292007, 011292008, 011293144, 011293146, 011293148, 011293149, 011293150, 011293151, 011293152, 011293153, 011293154, 011293155, 011293156, 011293157, 011293158, 011299439, 011299440, 011299441, 011299442, 011300976, 011308188, 011308189, 011308190, 011308191, 011309658, 011309659, 011309660, 011309661, 011309662, 011309663, 011309664, 011309665, 011320269, 011320270, 011320271, 011320273, 011321757, 011328221, 011328222, 011328223, 011328224, 011330532, 011334327, 011352163, 011409405, 011474759, 011478678, 011489587, 011489588, 011489589, 011489590, 011495966, 011495969, 011581913, 011602062, 011602063, 011630010, 011647433, 011653787, 011690656, 011877675, 011932175, 011936731, 012083677, 012103438, 012172329, 012223152, 012274049, 012328488, 012377499, 012402410, 012452367, 012520348, 012649156, 012690209, 012694377, 012740049, 012744497, 012812315, 012831441, 012845272, 012858825, 012862411, 012887638, 012953717, 013462725, 013467829, 013691886, 013764154, 013856492, 014370082, 014593086, 014691914, 015514047
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
hardness_rating60.0 SHORE DUROMETER A NOMINAL
center_hole_diameter4.952 INCHES MINIMUM AND 5.022 INCHES MAXIMUM IN
cross-sectional_height0.100 INCHES MINIMUM AND 0.106 INCHES MAXIMUM IN
material_document_and_classificationMIL-R-25988/3 MIL SPEC SINGLE MATERIAL RESPONSE
NSN5331-00-185-1735
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: MIL-R-25988/3 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: 0.067 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN
•
HARDNESS RATING: 60.0 SHORE DUROMETER A NOMINAL
•
ELONGATION PERCENTAGE: 125 MAXIMUM
•
CENTER HOLE DIAMETER: 0.734 INCHES MINIMUM AND 0.744 INCHES MAXIMUM IN
•
MATERIAL: RUBBER
TECHNICAL CHARACTERISTICS
CROSS-SECTIONAL HEIGHT0.067 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN
HARDNESS RATING60.0 SHORE DUROMETER A NOMINAL
ELONGATION PERCENTAGE125 MAXIMUM
CENTER HOLE DIAMETER0.734 INCHES MINIMUM AND 0.744 INCHES MAXIMUM IN
MATERIALRUBBER
SUBSTITUTES & CROSS-REFERENCES 5
2-018L1223-60Reference document
Same NSN cross-reference
Reference document — Secondary reference
MIL-DTL-25988/3Reference document
Same NSN cross-reference
Reference document — Identification reference
16606A54-94Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
M25988/3-018Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
3541-31-018Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusCancelled· 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-25988/3?
MIL-R-25988/3 is a O-RING.
What parts can replace MIL-R-25988/3?
There are 5 known substitutes for MIL-R-25988/3: 2-018L1223-60, MIL-DTL-25988/3, 16606A54-94 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MIL-R-25988/3?
MIL-R-25988/3 is cataloged in the U.S. Government catalog under NSN 5331-00-185-1735. This indicates validated use in U.S. government and defense supply chains.
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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.