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149854N4 — PIN,VALVE SEAT

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

149854N4: PIN,VALVE SEAT.

The PIN,VALVE SEAT is a the manufacturer industrial component. Key specifications include end_item_identification: ENGINE MODEL R1820, general_characteristics_item_description: ALUMINUM BRONZE AMS4640,0.309 IN. MIN,0.319 IN.

MAX O/A LG IN. This part is cataloged in the U.S. Government catalog under NSN 5315-01-018-3247, 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
149854N4
NSN: 5315-01-018-3247
FSC: 5315 — Nails, Machine Keys, and Pins
CAGE: 0AHP5 — CURTISS-WRIGHT CONTROLS, INC. DIV ACTUATION DIVISION (USA)
SPECIFICATIONS
end_item_identificationENGINE MODEL R1820
general_characteristics_item_descriptionALUMINUM BRONZE AMS4640,0.309 IN. MIN,0.319 IN. MAX O/A LG IN
NSN5315-01-018-3247
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 149854N4 · OEM ⚠ VERIFY BEFORE ORDERING Grade matters for torque spec — don't mix grades. A Grade 5 nut on a Grade 8 bolt weakens the joint. Lock nuts, wing nuts, and castle nuts are NOT interchangeable with standard hex ✓ BROKER TIP Match nut to bolt thread class and material. Stainless bolt + zinc nut = galvanic corrosion. Always verify finish matches (plain, zinc, hot-dip galvanized) PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
GENERAL CHARACTERISTICS ITEM DESCRIPTION: ALUMINUM BRONZE AMS4640,0.309 IN. MIN,0.319 IN. MAX O/A LG IN
TECHNICAL CHARACTERISTICS
GENERAL CHARACTERISTICS ITEM DESCRIPTIONALUMINUM BRONZE AMS4640,0.309 IN. MIN,0.319 IN. MAX O/A LG IN
END ITEM IDENTIFICATIONENGINE MODEL R1820
OTHER ITEMS IN FSC 5315 — Nails, Machine Keys, and Pins
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5315-00-000-1037 5315-00-000-1067 5315-00-000-1245 5315-00-000-1372 5315-00-000-1412 5315-00-001-1571 5315-00-001-1572 5315-00-001-1602
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 149854N4?
149854N4 is a PIN,VALVE SEAT.
What is the NSN for 149854N4?
149854N4 is cataloged in the U.S. Government catalog under NSN 5315-01-018-3247. 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.