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645825 — SEAT,VALVE

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

645825: SEAT,VALVE.

The SEAT,VALVE is a the manufacturer industrial component. Key specifications include material: ALUMINUM OVERALL, special_features: W/0.156 INDIA HOLE DRILLED THRU BODY, surface_treatment: ANODIZE OVERALL, fsc_application_data: VALVE,ENGINE FUEL SYSTEM,AIRCRAFT, seating_surface_shape: FLAT. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-641-1012, 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
645825
NSN: 5310-00-641-1012
NIINs: 006411012, 008223528
FSC: 5310 — Nuts and Washers
CAGE: 10001 — NAVAIR AND NAVSEA MANAGED ORIGINAL DESIGN ACTIVITY DWG NOT MATERIAL/PARTS SUPPLIER (USA)
SPECIFICATIONS
materialALUMINUM OVERALL
special_featuresW/0.156 INDIA HOLE DRILLED THRU BODY
surface_treatmentANODIZE OVERALL
fsc_application_dataVALVE,ENGINE FUEL SYSTEM,AIRCRAFT
seating_surface_shapeFLAT
NSN5310-00-641-1012
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 645825 · 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
•
OVERALL DIAMETER: 0.375 INCHES NOMINAL IN
•
HARDNESS RATING: 68.4 ROCKWELL M MINIMUM AND 108.0 ROCKWELL M MAXIMUM
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CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
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MINIMUM TENSILE STRENGTH: 16800 POUNDS PER SQUARE INCH LBS
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PERIPHERAL SHAPE STYLE: ROUND
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MATERIAL: PLASTIC OVERALL
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CENTER HOLE SHAPE STYLE: ROUND
•
HOLE DIAMETER: 0.169 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
OVERALL DIAMETER0.375 INCHES NOMINAL IN
HARDNESS RATING68.4 ROCKWELL M MINIMUM AND 108.0 ROCKWELL M MAXIMUM
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
MINIMUM TENSILE STRENGTH16800 POUNDS PER SQUARE INCH LBS
PERIPHERAL SHAPE STYLEROUND
MATERIALPLASTIC OVERALL
CENTER HOLE SHAPE STYLEROUND
HOLE DIAMETER0.169 INCHES NOMINAL IN
THICKNESS0.062 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES 1
A81520Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 645825?
645825 is a SEAT,VALVE.
What parts can replace 645825?
There is 1 known substitute for 645825: A81520. Substitute compatibility should be verified for your specific system.
What is the NSN for 645825?
645825 is cataloged in the U.S. Government catalog under NSN 5310-00-641-1012. 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.