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12987549 — PLATE,MOUNTING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

12987549: PLATE,MOUNTING.

The PLATE,MOUNTING is a the manufacturer industrial component. Key specifications include shape: SPECIAL, width: 3.540 INCHES NOMINAL3.540 INCHES NOMINAL IN, length: 4.880 INCHES NOMINAL4.880 INCHES NOMINAL IN, material: STEEL, mounting_hole_diameter: 0.359 INCHES NOMINAL ALL HOLES IN. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-477-9029, 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
12987549
NSN: 5340-01-477-9029
FSC: 5340 — Hardware, Commercial
CAGE: 19200 — COMBAT CAPABILITIES DEVELOPMENT COMMAND (CCDC) ARMAMENTS CENTER DBA CCDC DIV LOGISTICS RESEARCH AND ENGINEERING DIRECTORATE (USA)
SPECIFICATIONS
shapeSPECIAL
width3.540 INCHES NOMINAL3.540 INCHES NOMINAL IN
length4.880 INCHES NOMINAL4.880 INCHES NOMINAL IN
materialSTEEL
mounting_hole_diameter0.359 INCHES NOMINAL ALL HOLES IN
mounting_hole_quantity4
NSN5340-01-477-9029
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 12987549 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
•
MOUNTING HOLE QUANTITY: 4
•
LENGTH: 4.880 INCHES NOMINAL4.880 INCHES NOMINAL IN
•
MOUNTING HOLE DIAMETER: 0.359 INCHES NOMINAL ALL HOLES IN
•
SHAPE: SPECIAL
•
WIDTH: 3.540 INCHES NOMINAL3.540 INCHES NOMINAL IN
•
MATERIAL: STEEL
TECHNICAL CHARACTERISTICS
MOUNTING HOLE QUANTITY4
LENGTH4.880 INCHES NOMINAL4.880 INCHES NOMINAL IN
MOUNTING HOLE DIAMETER0.359 INCHES NOMINAL ALL HOLES IN
SHAPESPECIAL
WIDTH3.540 INCHES NOMINAL3.540 INCHES NOMINAL IN
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
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FREQUENTLY ASKED QUESTIONS
What is 12987549?
12987549 is a PLATE,MOUNTING.
What is the NSN for 12987549?
12987549 is cataloged in the U.S. Government catalog under NSN 5340-01-477-9029. 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.