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Technical Data Sheet
MIL-R-25988B ✓ 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 PACKING SPECIAL is a the manufacturer industrial component. Key specifications include color: BLUE BOTH SIDES, width: 36.000 INCHES NOMINAL IN, length: 36.000 INCHES NOMINAL IN, material: RUBBER FLUOROSILICONE CLASS FQ LOCATION NOT OTHERWISE SPECIFIED, thickness: 0.109 INCHES NOMINAL IN, surface_condition: SMOOTH BOTH SIDES. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-153-1041, 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-25988B
NSN: 5330-00-153-1041
FSC: 5330
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
colorBLUE BOTH SIDES
width36.000 INCHES NOMINAL IN
length36.000 INCHES NOMINAL IN
materialRUBBER FLUOROSILICONE CLASS FQ LOCATION NOT OTHERWISE SPECIFIED
thickness0.109 INCHES NOMINAL IN
surface_conditionSMOOTH BOTH SIDES
environmental_protectionFUEL RESISTANT AND OIL RESISTANT
minimum_tensile_strengthERR-060
nondefinitive_spec/std_data1 CLASS AND 60 GRADE OR 70 GRADE AND II TYPE
nonmetallic_hardness_rating55.0 MINIMUM SHORE DUROMETER A AND 75.0 MAXIMUM SHORE DUROMETER A
departure_from_cited_designatorAS MODIFIED BY LENGTH
material_document_and_classificationMIL-R-25988,TYPE II,CLASS 1,GRADE 60 OR 70 MIL SPEC SINGLE MATERIAL RESPONSE LOCATION NOT OTHERWISE SPECIFIED
NSN5330-00-153-1041
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: MIL-R-25988B 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
NONDEFINITIVE SPEC/STD DATA: 1 TYPE AND 1 CLASS AND 70 GRADE
TECHNICAL CHARACTERISTICS (FLIS)
NONDEFINITIVE SPEC/STD DATA1 TYPE AND 1 CLASS AND 70 GRADE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 19
MIL-R-25988BInterchangeable
interchangeable cross-reference
interchangeable
5-818Interchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-25988/2Interchangeable
interchangeable cross-reference
interchangeable
M25988/2-229Interchangeable
interchangeable cross-reference
interchangeable
S9412-111Interchangeable
interchangeable cross-reference
interchangeable
M25988/2-111Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MIL-R-25988B?
MIL-R-25988B is a PACKING SPECIAL.
What parts can replace MIL-R-25988B?
There are 19 known substitutes for MIL-R-25988B: MIL-R-25988B, 5-818, MIL-DTL-25988/2 and 16 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MIL-R-25988B?
MIL-R-25988B is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-153-1041. This indicates validated use in U.S. government and defense supply chains.
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