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PartsTable / COMPONENT / MILC5501TYPE3CLASSASIZE20
MILC5501TYPE3CLASSASIZE20 ✓ 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

PLUG,PROTECTIVE,DUST AND MOISTUR. Key specifications include material: ALUMINUM ALLOY 3003, drive_type: SERRATED OR SQUARE HEAD OR HEX SOCKET, design_type: THREADED, overall_diameter: 2.625 INCHES NOMINAL IN, surface_treatment: CHROMATE OR ANODIZE, nondefinitive_spec/std_data: 3 TYPE AND A CLASS AND 20 SIZE. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-804-1248, 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
MILC5501TYPE3CLASSASIZE20
NSN: 5340-00-804-1248
FSC: 5340
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialALUMINUM ALLOY 3003
drive_typeSERRATED OR SQUARE HEAD OR HEX SOCKET
design_typeTHREADED
overall_diameter2.625 INCHES NOMINAL IN
surface_treatmentCHROMATE OR ANODIZE
nondefinitive_spec/std_data3 TYPE AND A CLASS AND 20 SIZE
material_document_and_classificationQQ-A-250/2 FED SPEC SINGLE MATERIAL RESPONSE
thread_size_and_series/type_designator1-5/8-12 UN
surface_treatment_document_and_classificationMIL-C-5541, CLASS 1A MIL SPEC SINGLE TREATMENT RESPONSE OR MIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE A
NSN5340-00-804-1248
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: MILC5501TYPE3CLASSASIZE20 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: 2.625 INCHES NOMINAL IN
•
DRIVE TYPE: SERRATED OR SQUARE HEAD OR HEX SOCKET
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-C-5541, CLASS 1A MIL SPEC SINGLE TREATMENT RESPONSE OR MIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE A
•
MATERIAL: ALUMINUM ALLOY 3003
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-A-250/2 FED SPEC SINGLE MATERIAL RESPONSE
•
THREAD SIZE AND SERIES/TYPE DESIGNATOR: 1-5/8-12 UN
•
DESIGN TYPE: THREADED
•
SURFACE TREATMENT: CHROMATE OR ANODIZE
TECHNICAL CHARACTERISTICS (FLIS)
OVERALL DIAMETER2.625 INCHES NOMINAL IN
DRIVE TYPESERRATED OR SQUARE HEAD OR HEX SOCKET
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-C-5541, CLASS 1A MIL SPEC SINGLE TREATMENT RESPONSE OR MIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE A
MATERIALALUMINUM ALLOY 3003
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-A-250/2 FED SPEC SINGLE MATERIAL RESPONSE
THREAD SIZE AND SERIES/TYPE DESIGNATOR1-5/8-12 UN
DESIGN TYPETHREADED
SURFACE TREATMENTCHROMATE OR ANODIZE
NONDEFINITIVE SPEC/STD DATA3 TYPE AND A CLASS AND 20 SIZE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 29
5340PL1866828Interchangeable
interchangeable cross-reference
interchangeable
81584Interchangeable
interchangeable cross-reference
interchangeable
10160009Interchangeable
interchangeable cross-reference
interchangeable
M5501/1-4Interchangeable
interchangeable cross-reference
interchangeable
10117358Interchangeable
interchangeable cross-reference
interchangeable
5-4Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MILC5501TYPE3CLASSASIZE20?
MILC5501TYPE3CLASSASIZE20 is a PLUG,PROTECTIVE,DUST AND MOISTUR.
What parts can replace MILC5501TYPE3CLASSASIZE20?
There are 29 known substitutes for MILC5501TYPE3CLASSASIZE20: 5340PL1866828, 81584, 10160009 and 26 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MILC5501TYPE3CLASSASIZE20?
MILC5501TYPE3CLASSASIZE20 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-804-1248. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026