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1684M5 — COVER,ACCESS

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

1684M5: COVER,ACCESS.

The COVER,ACCESS is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY A380.0, ear_radius: 0.310 INCHES NOMINAL IN, body_radius: 2.375 INCHES NOMINAL IN, hole_diameter: 0.438 INCHES NOMINAL IN, body_thickness: 0.125 INCHES NOMINAL IN, inside_diameter: 4.250 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-621-2567, 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
1684M5
NSN: 5340-00-621-2567
FSC: 5340 — Hardware, Commercial
CAGE: 56442 — DIAMOND REO TRUCK CO (USA)
SPECIFICATIONS
materialALUMINUM ALLOY A380.0
ear_radius0.310 INCHES NOMINAL IN
body_radius2.375 INCHES NOMINAL IN
ear_quantity6
hole_diameter0.438 INCHES NOMINAL IN
body_thickness0.125 INCHES NOMINAL IN
inside_diameter4.250 INCHES NOMINAL IN
inverted_radius0.310 INCHES NOMINAL IN
flange_thickness0.420 INCHES NOMINAL IN
surface_treatmentOXIDE FILM
bolt_circle_diameter5.035 INCHES MINIMUM AND 5.055 INCHES MAXIMUM IN
inside_corner_radius0.125 INCHES NOMINAL IN
NSN5340-00-621-2567
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 1684M5 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
•
EAR QUANTITY: 6
•
FLANGE THICKNESS: 0.420 INCHES NOMINAL IN
•
BOLT CIRCLE HOLE QUANTITY: 6
•
INSIDE CORNER RADIUS: 0.125 INCHES NOMINAL IN
•
FIRST RECESS INSIDE HEIGHT: 0.750 INCHES NOMINAL IN
•
EAR RADIUS: 0.310 INCHES NOMINAL IN
•
MOUNTING OPENING SHAPE STYLE: UNTHREADED HOLE
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-A-591 FED SPEC SINGLE MATERIAL RESPONSE
TECHNICAL CHARACTERISTICS
EAR QUANTITY6
FLANGE THICKNESS0.420 INCHES NOMINAL IN
BOLT CIRCLE HOLE QUANTITY6
INSIDE CORNER RADIUS0.125 INCHES NOMINAL IN
FIRST RECESS INSIDE HEIGHT0.750 INCHES NOMINAL IN
EAR RADIUS0.310 INCHES NOMINAL IN
MOUNTING OPENING SHAPE STYLEUNTHREADED HOLE
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-A-591 FED SPEC SINGLE MATERIAL RESPONSE
CROSS-SECTIONAL SHAPE STYLECIRCULAR RECESS
INVERTED RADIUS0.310 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES 1
5340006212567Reference document
Same NSN cross-reference
Reference document — Secondary reference
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 1684M5?
1684M5 is a COVER,ACCESS.
What parts can replace 1684M5?
There is 1 known substitute for 1684M5: 5340006212567. Substitute compatibility should be verified for your specific system.
What is the NSN for 1684M5?
1684M5 is cataloged in the U.S. Government catalog under NSN 5340-00-621-2567. 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.