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Technical Data Sheet
4A249 ✓ 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: ZINC, drive_type: SCREW SLOT, design_type: THREADED, overall_diameter: 0.500 INCHES NOMINAL IN, special_features: COLOR IS GRAY; PACKAGE QUANTITY IS 1000; UNIT OF MEASURE FOR THIS ITEM IS NPT (NATIONAL PIPE THREAD), end_item_identification: S-843/TRB-44A,SHELTER,NONEXPANDABLE A. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-01-543-3483, 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
4A249
NSN: 5340-01-543-3483
FSC: 5340
CAGE: 25795 — W.W. GRAINGER, INC. DIV GOVERNMENT SALES DIVISION (USA)
SPECIFICATIONS
materialZINC
drive_typeSCREW SLOT
design_typeTHREADED
overall_diameter0.500 INCHES NOMINAL IN
special_featuresCOLOR IS GRAY; PACKAGE QUANTITY IS 1000; UNIT OF MEASURE FOR THIS ITEM IS NPT (NATIONAL PIPE THREAD)
end_item_identificationS-843/TRB-44A,SHELTER,NONEXPANDABLE A
part_name_assigned_by_controlling_agencyCLOSURE PLUG
NSN5340-01-543-3483
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 4A249 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: 0.500 INCHES NOMINAL IN
DESIGN TYPE: THREADED
MATERIAL: ZINC
DRIVE TYPE: SCREW SLOT
TECHNICAL CHARACTERISTICS (FLIS)
SPECIAL FEATURESCOLOR IS GRAY; PACKAGE QUANTITY IS 1000; UNIT OF MEASURE FOR THIS ITEM IS NPT (NATIONAL PIPE THREAD)
OVERALL DIAMETER0.500 INCHES NOMINAL IN
PART NAME ASSIGNED BY CONTROLLING AGENCYCLOSURE PLUG
DESIGN TYPETHREADED
MATERIALZINC
END ITEM IDENTIFICATIONS-843/TRB-44A,SHELTER,NONEXPANDABLE A
DRIVE TYPESCREW SLOT
VERIFIED SUBSTITUTES & CROSS-REFERENCES 9
52699Interchangeable
interchangeable cross-reference
interchangeable
AMS-QQ-A-200/3Interchangeable
interchangeable cross-reference
interchangeable
LS2403Interchangeable
interchangeable cross-reference
interchangeable
PL-52699 PIECE 13Interchangeable
interchangeable cross-reference
interchangeable
50102Interchangeable
interchangeable cross-reference
interchangeable
PL-52699 PIECE 12Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 4A249?
4A249 is a PLUG,PROTECTIVE,DUST AND MOISTUR.
What parts can replace 4A249?
There are 9 known substitutes for 4A249: 52699, AMS-QQ-A-200/3, LS2403 and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 4A249?
4A249 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-01-543-3483. This indicates validated use in U.S. government and defense supply chains.
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