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678E17 — COVER,ACCESS

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

678E17: COVER,ACCESS.

The COVER,ACCESS is a the manufacturer industrial component. Key specifications include width: 6.125 INCHES NOMINAL IN, length: 7.688 INCHES NOMINAL IN, material: STEEL COMP 1008 AND STEEL COMP 1020, inside_angle: 7.0 DEGREES NOMINAL, hole_diameter: 0.281 INCHES NOMINAL IN, body_thickness: 0.048 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-040-1980, 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
678E17
NSN: 5340-00-040-1980
FSC: 5340 — Hardware, Commercial
CAGE: 56442 — DIAMOND REO TRUCK CO (USA)
SPECIFICATIONS
width6.125 INCHES NOMINAL IN
length7.688 INCHES NOMINAL IN
materialSTEEL COMP 1008 AND STEEL COMP 1020
inside_angle7.0 DEGREES NOMINAL
hole_diameter0.281 INCHES NOMINAL IN
body_thickness0.048 INCHES NOMINAL IN
surface_treatmentENAMEL
securing_device_typeTHREADED FASTENER
peripheral_shape_styleRECTANGLE, MULTI HOLES
hole_quantity_along_width2
first_recess_inside_height0.031 INCHES NOMINAL IN
hole_quantity_along_length4
NSN5340-00-040-1980
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 678E17 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: 2.063 INCHES NOMINAL IN
•
LENGTH: 7.688 INCHES NOMINAL IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: TT-E-529 FED SPEC SINGLE TREATMENT RESPONSE
•
DISTANCE BETWEEN HOLES ALONG LENGTH: 5.313 INCHES NOMINAL IN
•
FIRST RECESS INSIDE HEIGHT: 0.031 INCHES NOMINAL IN
•
HOLE QUANTITY ALONG LENGTH: 4
•
DISTANCE BETWEEN HOLE CENTERLINE AND FIRST HOLE ALONG LENGTH: 0.750 INCHES NOMINAL IN
•
MOUNTING OPENING SHAPE STYLE: UNTHREADED HOLE
TECHNICAL CHARACTERISTICS
DISTANCE FROM FIRST HOLE CENTERLINE TO END ALONG WIDTH2.063 INCHES NOMINAL IN
LENGTH7.688 INCHES NOMINAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONTT-E-529 FED SPEC SINGLE TREATMENT RESPONSE
DISTANCE BETWEEN HOLES ALONG LENGTH5.313 INCHES NOMINAL IN
FIRST RECESS INSIDE HEIGHT0.031 INCHES NOMINAL IN
HOLE QUANTITY ALONG LENGTH4
DISTANCE BETWEEN HOLE CENTERLINE AND FIRST HOLE ALONG LENGTH0.750 INCHES NOMINAL IN
MOUNTING OPENING SHAPE STYLEUNTHREADED HOLE
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-698 FED SPEC SINGLE MATERIAL RESPONSE
CROSS-SECTIONAL SHAPE STYLESQUARE OR RECTANGULAR RECESS
SUBSTITUTES & CROSS-REFERENCES 1
67244Reference 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 678E17?
678E17 is a COVER,ACCESS.
What parts can replace 678E17?
There is 1 known substitute for 678E17: 67244. Substitute compatibility should be verified for your specific system.
What is the NSN for 678E17?
678E17 is cataloged in the U.S. Government catalog under NSN 5340-00-040-1980. 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.