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6B7939 — COVER,ACCESS

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

6B7939: COVER,ACCESS.

The COVER,ACCESS is a the manufacturer industrial component. Key specifications include width: 7.500 INCHES NOMINAL IN, length: 9.750 INCHES NOMINAL IN, material: STEEL, corner_radius: 0.500 INCHES NOMINAL IN, hole_diameter: 0.438 INCHES NOMINAL IN, body_thickness: 0.078 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-545-0263, 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
6B7939
NSN: 5340-00-545-0263
FSC: 5340 — Hardware, Commercial
CAGE: 11083 — CATERPILLAR INC DIV CATERPILLAR DEFENSE (USA)
SPECIFICATIONS
width7.500 INCHES NOMINAL IN
length9.750 INCHES NOMINAL IN
materialSTEEL
corner_radius0.500 INCHES NOMINAL IN
hole_diameter0.438 INCHES NOMINAL IN
body_thickness0.078 INCHES NOMINAL IN
inside_diameter6.000 INCHES NOMINAL IN
flange_thickness0.078 INCHES NOMINAL IN
fsc_application_dataTRANSMISSION CASE,CRAWLER TRACTOR
securing_device_typeTHREADED FASTENER
peripheral_shape_styleRECTANGLE, FOUR HOLES
first_recess_inside_height0.656 INCHES NOMINAL IN
NSN5340-00-545-0263
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 6B7939 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: 0.500 INCHES NOMINAL IN
•
FSC APPLICATION DATA: TRANSMISSION CASE,CRAWLER TRACTOR
•
CORNER RADIUS: 0.500 INCHES NOMINAL IN
•
LENGTH: 9.750 INCHES NOMINAL IN
•
DISTANCE BETWEEN HOLES ALONG LENGTH: 8.750 INCHES NOMINAL IN
•
FLANGE THICKNESS: 0.078 INCHES NOMINAL IN
•
FIRST RECESS INSIDE HEIGHT: 0.656 INCHES NOMINAL IN
•
DISTANCE BETWEEN HOLES ALONG WIDTH: 6.500 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
DISTANCE FROM FIRST HOLE CENTERLINE TO END ALONG WIDTH0.500 INCHES NOMINAL IN
FSC APPLICATION DATATRANSMISSION CASE,CRAWLER TRACTOR
CORNER RADIUS0.500 INCHES NOMINAL IN
LENGTH9.750 INCHES NOMINAL IN
DISTANCE BETWEEN HOLES ALONG LENGTH8.750 INCHES NOMINAL IN
FLANGE THICKNESS0.078 INCHES NOMINAL IN
FIRST RECESS INSIDE HEIGHT0.656 INCHES NOMINAL IN
DISTANCE BETWEEN HOLES ALONG WIDTH6.500 INCHES NOMINAL IN
MOUNTING OPENING SHAPE STYLEUNTHREADED HOLE
CROSS-SECTIONAL SHAPE STYLECIRCULAR RECESS
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
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FREQUENTLY ASKED QUESTIONS
What is 6B7939?
6B7939 is a COVER,ACCESS.
What is the NSN for 6B7939?
6B7939 is cataloged in the U.S. Government catalog under NSN 5340-00-545-0263. 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.