PartsTable
Technical Data Sheet
Download PDF

4123378 — COVER,ACCESS

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

4123378: COVER,ACCESS.

The COVER,ACCESS is a the manufacturer industrial component. Key specifications include material: STEEL, corner_radius: 0.500 INCHES NOMINAL IN, hole_diameter: 0.406 INCHES NOMINAL IN, body_thickness: 0.375 INCHES NOMINAL IN, width_across_flats: 6.562 INCHES NOMINAL IN, bolt_circle_diameter: 6.625 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-459-5970, 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
4123378
NSN: 5340-00-459-5970
FSC: 5340 — Hardware, Commercial
CAGE: 57217 — STRIEGEL SUPPLY, INC. DBA STRIEGEL SUPPLY INC (USA)
SPECIFICATIONS
materialSTEEL
corner_radius0.500 INCHES NOMINAL IN
hole_diameter0.406 INCHES NOMINAL IN
body_thickness0.375 INCHES NOMINAL IN
corner_quantity6
width_across_flats6.562 INCHES NOMINAL IN
bolt_circle_diameter6.625 INCHES NOMINAL IN
securing_device_typeTHREADED FASTENER
peripheral_shape_styleREGULAR POLYGON, MULTI HOLES
bolt_circle_hole_quantity6
cross-sectional_shape_styleFLAT
mounting_opening_shape_styleUNTHREADED HOLE
NSN5340-00-459-5970
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 4123378 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
•
WIDTH ACROSS FLATS: 6.562 INCHES NOMINAL IN
•
CORNER QUANTITY: 6
•
CORNER RADIUS: 0.500 INCHES NOMINAL IN
•
BOLT CIRCLE HOLE QUANTITY: 6
•
MOUNTING OPENING SHAPE STYLE: UNTHREADED HOLE
•
CROSS-SECTIONAL SHAPE STYLE: FLAT
•
SECURING DEVICE TYPE: THREADED FASTENER
•
BOLT CIRCLE DIAMETER: 6.625 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS6.562 INCHES NOMINAL IN
CORNER QUANTITY6
CORNER RADIUS0.500 INCHES NOMINAL IN
BOLT CIRCLE HOLE QUANTITY6
MOUNTING OPENING SHAPE STYLEUNTHREADED HOLE
CROSS-SECTIONAL SHAPE STYLEFLAT
SECURING DEVICE TYPETHREADED FASTENER
BOLT CIRCLE DIAMETER6.625 INCHES NOMINAL IN
PERIPHERAL SHAPE STYLEREGULAR POLYGON, MULTI HOLES
MATERIALSTEEL
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
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
Ready to buy 4123378?
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 4123378?
4123378 is a COVER,ACCESS.
What is the NSN for 4123378?
4123378 is cataloged in the U.S. Government catalog under NSN 5340-00-459-5970. 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 — 4123378

✓ 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.