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4B21109-109A — COVER,ACCESS

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

4B21109-109A: COVER,ACCESS.

The COVER,ACCESS is a the manufacturer industrial component. Key specifications include width: 8.000 INCHES NOMINAL IN, length: 14.000 INCHES NOMINAL IN, material: ALUMINUM ALLOY 2024, surface_treatment: PAINT, fsc_application_data: LANDING GEAR SEQUENCING CONTROL BOX, securing_device_type: TURNLOCK FASTENER. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-150-8360, 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
4B21109-109A
NSN: 5340-00-150-8360
FSC: 5340 — Hardware, Commercial
CAGE: 98897 — LOCKHEED MARTIN CORP (USA)
SPECIFICATIONS
width8.000 INCHES NOMINAL IN
length14.000 INCHES NOMINAL IN
materialALUMINUM ALLOY 2024
surface_treatmentPAINT
fsc_application_dataLANDING GEAR SEQUENCING CONTROL BOX
securing_device_typeTURNLOCK FASTENER
peripheral_shape_styleRECTANGLE, FOUR HOLES
mounting_opening_shape_styleUNTHREADED HOLE
distance_between_holes_along_width5.600 INCHES NOMINAL IN
distance_between_holes_along_length13.050 INCHES NOMINAL IN
material_document_and_classificationQQ-A-250/5,T3 FED SPEC SINGLE MATERIAL RESPONSE
distance_from_first_hole_centerline_to_end_along_width3.000 INCHES NOMINAL IN
NSN5340-00-150-8360
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 4B21109-109A 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
•
DISTANCE FROM FIRST HOLE CENTERLINE TO END ALONG WIDTH: 3.000 INCHES NOMINAL IN
•
FSC APPLICATION DATA: LANDING GEAR SEQUENCING CONTROL BOX
•
LENGTH: 14.000 INCHES NOMINAL IN
•
DISTANCE BETWEEN HOLES ALONG LENGTH: 13.050 INCHES NOMINAL IN
•
DISTANCE BETWEEN HOLES ALONG WIDTH: 5.600 INCHES NOMINAL IN
•
MOUNTING OPENING SHAPE STYLE: UNTHREADED HOLE
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-A-250/5,T3 FED SPEC SINGLE MATERIAL RESPONSE
•
SECURING DEVICE TYPE: TURNLOCK FASTENER
TECHNICAL CHARACTERISTICS
DISTANCE FROM FIRST HOLE CENTERLINE TO END ALONG WIDTH3.000 INCHES NOMINAL IN
FSC APPLICATION DATALANDING GEAR SEQUENCING CONTROL BOX
LENGTH14.000 INCHES NOMINAL IN
DISTANCE BETWEEN HOLES ALONG LENGTH13.050 INCHES NOMINAL IN
DISTANCE BETWEEN HOLES ALONG WIDTH5.600 INCHES NOMINAL IN
MOUNTING OPENING SHAPE STYLEUNTHREADED HOLE
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-A-250/5,T3 FED SPEC SINGLE MATERIAL RESPONSE
SECURING DEVICE TYPETURNLOCK FASTENER
DISTANCE FROM FIRST HOLE CENTERLINE TO END ALONG LENGTH0.470 INCHES NOMINAL IN
SURFACE TREATMENTPAINT
OTHER ITEMS IN FSC 5340 — Hardware, Commercial
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5340-00-000-0068 5340-00-000-0132 5340-00-000-8150 5340-00-001-1251 5340-00-001-1264 5340-00-001-1265 5340-00-001-1266 5340-00-001-1275
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 4B21109-109A?
4B21109-109A is a COVER,ACCESS.
What is the NSN for 4B21109-109A?
4B21109-109A is cataloged in the U.S. Government catalog under NSN 5340-00-150-8360. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
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.