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676990-3 — COVER,ACCESS

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

676990-3: COVER,ACCESS.

The COVER,ACCESS is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY 2024, hole_diameter: 0.179 INCHES MINIMUM AND 0.185 INCHES MAXIMUM IN, body_thickness: 0.280 INCHES NOMINAL IN, outside_diameter: 1.760 INCHES NOMINAL IN, special_features: FLAT ON ONE SIDE 0.435 IN. FROM CENTER IN, securing_device_type: THREADED FASTENER.

This part is cataloged in the U.S. Government catalog under NSN 5340-01-056-1664, 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
676990-3
NSN: 5340-01-056-1664
FSC: 5340 — Hardware, Commercial
CAGE: 20418 — DRS SUSTAINMENT SYSTEMS, INC. (USA)
SPECIFICATIONS
materialALUMINUM ALLOY 2024
hole_diameter0.179 INCHES MINIMUM AND 0.185 INCHES MAXIMUM IN
body_thickness0.280 INCHES NOMINAL IN
outside_diameter1.760 INCHES NOMINAL IN
special_featuresFLAT ON ONE SIDE 0.435 IN. FROM CENTER IN
securing_device_typeTHREADED FASTENER
peripheral_shape_styleROUND, MULTI HOLES
hole_quantity_along_length3
cross-sectional_shape_styleFLAT
mounting_opening_shape_styleUNTHREADED HOLE
distance_between_hole_centers0.625 INCHES NOMINAL IN
material_document_and_classificationQQ-A-225/6,COND T6 FED SPEC SINGLE MATERIAL RESPONSE
NSN5340-01-056-1664
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 676990-3 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
•
HOLE QUANTITY ALONG LENGTH: 3
•
DISTANCE BETWEEN HOLE CENTERS: 0.625 INCHES NOMINAL IN
•
MOUNTING OPENING SHAPE STYLE: UNTHREADED HOLE
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-A-225/6,COND T6 FED SPEC SINGLE MATERIAL RESPONSE
•
CROSS-SECTIONAL SHAPE STYLE: FLAT
•
OUTSIDE DIAMETER: 1.760 INCHES NOMINAL IN
•
BOLT HOLE CENTERLINE TO NEAREST EDGE DISTANCE: 0.255 INCHES NOMINAL IN
•
SECURING DEVICE TYPE: THREADED FASTENER
TECHNICAL CHARACTERISTICS
HOLE QUANTITY ALONG LENGTH3
DISTANCE BETWEEN HOLE CENTERS0.625 INCHES NOMINAL IN
MOUNTING OPENING SHAPE STYLEUNTHREADED HOLE
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-A-225/6,COND T6 FED SPEC SINGLE MATERIAL RESPONSE
CROSS-SECTIONAL SHAPE STYLEFLAT
OUTSIDE DIAMETER1.760 INCHES NOMINAL IN
BOLT HOLE CENTERLINE TO NEAREST EDGE DISTANCE0.255 INCHES NOMINAL IN
SECURING DEVICE TYPETHREADED FASTENER
SPECIAL FEATURESFLAT ON ONE SIDE 0.435 IN. FROM CENTER IN
PERIPHERAL SHAPE STYLEROUND, MULTI HOLES
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 1
12266385Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 676990-3?
676990-3 is a COVER,ACCESS.
What parts can replace 676990-3?
There is 1 known substitute for 676990-3: 12266385. Substitute compatibility should be verified for your specific system.
What is the NSN for 676990-3?
676990-3 is cataloged in the U.S. Government catalog under NSN 5340-01-056-1664. 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.