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9M9549 — COVER,ACCESS

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

9M9549: COVER,ACCESS.

The COVER,ACCESS is a the manufacturer industrial component. Key specifications include hole_diameter: 0.250 INCHES NOMINAL IN, inside_diameter: 3.125 INCHES NOMINAL IN, flange_thickness: 0.188 INCHES NOMINAL IN, outside_diameter: 4.250 INCHES NOMINAL IN, features_provided: SEALING CAPABILITY, securing_device_type: THREADED FASTENER. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-931-7929, 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
9M9549
NSN: 5340-00-931-7929
FSC: 5340 — Hardware, Commercial
CAGE: 11083 — CATERPILLAR INC DIV CATERPILLAR DEFENSE (USA)
SPECIFICATIONS
hole_diameter0.250 INCHES NOMINAL IN
inside_diameter3.125 INCHES NOMINAL IN
flange_thickness0.188 INCHES NOMINAL IN
outside_diameter4.250 INCHES NOMINAL IN
features_providedSEALING CAPABILITY
securing_device_typeTHREADED FASTENER
peripheral_shape_styleROUND, ONE HOLE
end_item_identificationW/S: TRACTOR, CR, T-11
first_recess_inside_height0.500 INCHES NOMINAL IN
mounting_opening_shape_styleUNTHREADED HOLE
NSN5340-00-931-7929
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 9M9549 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
•
FLANGE THICKNESS: 0.188 INCHES NOMINAL IN
•
FIRST RECESS INSIDE HEIGHT: 0.500 INCHES NOMINAL IN
•
MOUNTING OPENING SHAPE STYLE: UNTHREADED HOLE
•
OUTSIDE DIAMETER: 4.250 INCHES NOMINAL IN
•
FEATURES PROVIDED: SEALING CAPABILITY
•
SECURING DEVICE TYPE: THREADED FASTENER
•
INSIDE DIAMETER: 3.125 INCHES NOMINAL IN
•
PERIPHERAL SHAPE STYLE: ROUND, ONE HOLE
TECHNICAL CHARACTERISTICS
FLANGE THICKNESS0.188 INCHES NOMINAL IN
FIRST RECESS INSIDE HEIGHT0.500 INCHES NOMINAL IN
MOUNTING OPENING SHAPE STYLEUNTHREADED HOLE
OUTSIDE DIAMETER4.250 INCHES NOMINAL IN
FEATURES PROVIDEDSEALING CAPABILITY
SECURING DEVICE TYPETHREADED FASTENER
INSIDE DIAMETER3.125 INCHES NOMINAL IN
PERIPHERAL SHAPE STYLEROUND, ONE HOLE
END ITEM IDENTIFICATIONW/S: TRACTOR, CR, T-11
HOLE DIAMETER0.250 INCHES NOMINAL IN
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 2
P16859Reference document
Same NSN cross-reference
Reference document — Secondary reference
4L8323Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 9M9549?
9M9549 is a COVER,ACCESS.
What parts can replace 9M9549?
There are 2 known substitutes for 9M9549: P16859, 4L8323. Substitute compatibility should be verified for your specific system.
What is the NSN for 9M9549?
9M9549 is cataloged in the U.S. Government catalog under NSN 5340-00-931-7929. 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.