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Technical Data Sheet
NAS842-5A ✓ 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, thread_class: 2A A, overall_diameter: 0.680 INCHES MINIMUM AND 0.940 INCHES MAXIMUM IN, features_provided: SHOULDER. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-804-1239, 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
NAS842-5A
NSN: 5340-00-804-1239
FSC: 5340
CAGE: 80205 — NATIONAL AEROSPACE STANDARDS COMMITTEE AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA INC NOT FOR RFQ OR SOLICITATION USE (USA)
SPECIFICATIONS
materialALUMINUM ALLOY 3003
drive_typeSERRATED OR SQUARE HEAD OR HEX SOCKET
design_typeTHREADED
thread_class2A A
overall_diameter0.680 INCHES MINIMUM AND 0.940 INCHES MAXIMUM IN
features_providedSHOULDER
surface_treatmentCHROMATE OR ANODIZE
nondefinitive_spec/std_data1 TYPE AND C CLASS
material_document_and_classificationQQ-A-250/2 FED SPEC SINGLE MATERIAL RESPONSE
thread_size_and_series/type_designator1/2-20 NF
surface_treatment_document_and_classificationMIL-C-5541, CLASS 1A MIL SPEC SINGLE TREATMENT RESPONSE OR MIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE A
NSN5340-00-804-1239
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: NAS842-5A 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
THREAD CLASS: 2A A
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
OVERALL DIAMETER: 0.680 INCHES MINIMUM AND 0.940 INCHES MAXIMUM IN
THREAD SIZE AND SERIES/TYPE DESIGNATOR: 1/2-20 NF
DESIGN TYPE: THREADED
DRIVE TYPE: SERRATED OR SQUARE HEAD OR HEX SOCKET
MATERIAL: ALUMINUM ALLOY 3003
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-A-250/2 FED SPEC SINGLE MATERIAL RESPONSE
TECHNICAL CHARACTERISTICS (FLIS)
THREAD CLASS2A A
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-C-5541, CLASS 1A MIL SPEC SINGLE TREATMENT RESPONSE OR MIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE A
OVERALL DIAMETER0.680 INCHES MINIMUM AND 0.940 INCHES MAXIMUM IN
THREAD SIZE AND SERIES/TYPE DESIGNATOR1/2-20 NF
DESIGN TYPETHREADED
DRIVE TYPESERRATED OR SQUARE HEAD OR HEX SOCKET
MATERIALALUMINUM ALLOY 3003
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-A-250/2 FED SPEC SINGLE MATERIAL RESPONSE
FEATURES PROVIDEDSHOULDER
NONDEFINITIVE SPEC/STD DATA1 TYPE AND C CLASS
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
NAS847Upgraded Successor
successor cross-reference
successor
MIL-C-5501/7Upgraded Successor
successor cross-reference
successor
M5501/7-F24Upgraded Successor
successor cross-reference
successor
AEP1543-2Upgraded Successor
successor cross-reference
successor
EC14Upgraded Successor
successor cross-reference
successor
36B505139P4Upgraded Successor
successor cross-reference
successor
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is NAS842-5A?
NAS842-5A is a PLUG,PROTECTIVE,DUST AND MOISTUR.
What parts can replace NAS842-5A?
There are 12 known substitutes for NAS842-5A: NAS847, MIL-C-5501/7, M5501/7-F24 and 9 more. Substitute compatibility should be verified for your specific system.
What is the NSN for NAS842-5A?
NAS842-5A is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-804-1239. This indicates validated use in U.S. government and defense supply chains.
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