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3K6879 — CUP,COMPRESSION

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

3K6879: CUP,COMPRESSION.

The CUP,COMPRESSION is a the manufacturer industrial component. Key specifications include material: RUBBER SYNTHETIC OVERALL, overall_length: 0.290 INCHES NOMINAL IN, overall_diameter: 0.775 INCHES NOMINAL IN, feather_edge_angle: 20.0 DEGREES NOMINAL, recess_inside_diameter: 0.525 INCHES NOMINAL IN, base_material_thickness: 0.078 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-862-1179, 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
3K6879
NSN: 5340-00-862-1179
FSC: 5340 — Hardware, Commercial
CAGE: 11083 — CATERPILLAR INC DIV CATERPILLAR DEFENSE (USA)
SPECIFICATIONS
materialRUBBER SYNTHETIC OVERALL
overall_length0.290 INCHES NOMINAL IN
overall_diameter0.775 INCHES NOMINAL IN
feather_edge_angle20.0 DEGREES NOMINAL
recess_inside_diameter0.525 INCHES NOMINAL IN
base_material_thickness0.078 INCHES NOMINAL IN
recess_major_inside_diameter0.708 INCHES NOMINAL IN
NSN5340-00-862-1179
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 3K6879 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
•
FEATHER EDGE ANGLE: 20.0 DEGREES NOMINAL
•
OVERALL DIAMETER: 0.775 INCHES NOMINAL IN
•
RECESS MAJOR INSIDE DIAMETER: 0.708 INCHES NOMINAL IN
•
BASE MATERIAL THICKNESS: 0.078 INCHES NOMINAL IN
•
MATERIAL: RUBBER SYNTHETIC OVERALL
•
RECESS INSIDE DIAMETER: 0.525 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
FEATHER EDGE ANGLE20.0 DEGREES NOMINAL
OVERALL DIAMETER0.775 INCHES NOMINAL IN
OVERALL LENGTH0.290 INCHES NOMINAL IN
RECESS MAJOR INSIDE DIAMETER0.708 INCHES NOMINAL IN
BASE MATERIAL THICKNESS0.078 INCHES NOMINAL IN
MATERIALRUBBER SYNTHETIC OVERALL
RECESS INSIDE DIAMETER0.525 INCHES NOMINAL 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
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FREQUENTLY ASKED QUESTIONS
What is 3K6879?
3K6879 is a CUP,COMPRESSION.
What is the NSN for 3K6879?
3K6879 is cataloged in the U.S. Government catalog under NSN 5340-00-862-1179. 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.