PartsTable
Technical Data Sheet
Download PDF

4N3840 — COVER,ACCESS

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

4N3840: COVER,ACCESS.

The COVER,ACCESS is a the manufacturer industrial component. Key specifications include width: 1.690 INCHES NOMINAL IN, length: 2.524 INCHES NOMINAL IN, material: STEEL, body_radius: 0.420 INCHES NOMINAL IN, corner_radius: 0.340 INCHES NOMINAL IN, hole_diameter: 0.340 INCHES MINIMUM AND 0.356 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-107-4130, 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
4N3840
NSN: 5340-01-107-4130
FSC: 5340 — Hardware, Commercial
CAGE: 11083 — CATERPILLAR INC DIV CATERPILLAR DEFENSE (USA)
SPECIFICATIONS
width1.690 INCHES NOMINAL IN
length2.524 INCHES NOMINAL IN
materialSTEEL
body_radius0.420 INCHES NOMINAL IN
corner_radius0.340 INCHES NOMINAL IN
hole_diameter0.340 INCHES MINIMUM AND 0.356 INCHES MAXIMUM IN
body_thickness0.285 INCHES MINIMUM AND 0.325 INCHES MAXIMUM IN
peripheral_shape_styleDIAMOND, ROUNDED CORNERS, TWO HOLES
cross-sectional_shape_styleFLAT
mounting_opening_shape_styleUNTHREADED HOLE
distance_between_holes_along_length1.844 INCHES NOMINAL IN
NSN5340-01-107-4130
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 4N3840 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
•
CORNER RADIUS: 0.340 INCHES NOMINAL IN
•
LENGTH: 2.524 INCHES NOMINAL IN
•
DISTANCE BETWEEN HOLES ALONG LENGTH: 1.844 INCHES NOMINAL IN
•
MOUNTING OPENING SHAPE STYLE: UNTHREADED HOLE
•
CROSS-SECTIONAL SHAPE STYLE: FLAT
•
BODY RADIUS: 0.420 INCHES NOMINAL IN
•
PERIPHERAL SHAPE STYLE: DIAMOND, ROUNDED CORNERS, TWO HOLES
•
WIDTH: 1.690 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
CORNER RADIUS0.340 INCHES NOMINAL IN
LENGTH2.524 INCHES NOMINAL IN
DISTANCE BETWEEN HOLES ALONG LENGTH1.844 INCHES NOMINAL IN
MOUNTING OPENING SHAPE STYLEUNTHREADED HOLE
CROSS-SECTIONAL SHAPE STYLEFLAT
BODY RADIUS0.420 INCHES NOMINAL IN
PERIPHERAL SHAPE STYLEDIAMOND, ROUNDED CORNERS, TWO HOLES
WIDTH1.690 INCHES NOMINAL IN
MATERIALSTEEL
HOLE DIAMETER0.340 INCHES MINIMUM AND 0.356 INCHES MAXIMUM 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

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
Ready to buy 4N3840?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is 4N3840?
4N3840 is a COVER,ACCESS.
What is the NSN for 4N3840?
4N3840 is cataloged in the U.S. Government catalog under NSN 5340-01-107-4130. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — 4N3840

✓ 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.