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2640-402X3PC9 — WASHER,FLAT

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

2640-402X3PC9: WASHER,FLAT.

The WASHER,FLAT is a the manufacturer industrial component. Key specifications include end_item_identification: 1.00 IN BALL VALVE IN, criticality_code_justification: ZZZY, reference_number_differentiating_characteristics: CLEANING, PACKAGING, AND MARKING IAW MIL-STD-1330D. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-904-0743, 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
2640-402X3PC9
NSN: 5310-00-904-0743
NIINs: 009040743, 013905443
FSC: 5310 — Nuts and Washers
CAGE: 96169 — ELECTRIC BOAT CORPORATION DIV GENERAL DYNAMICS ELECTRIC BOAT (USA)
SPECIFICATIONS
end_item_identification1.00 IN BALL VALVE IN
criticality_code_justificationZZZY
reference_number_differentiating_characteristicsCLEANING, PACKAGING, AND MARKING IAW MIL-STD-1330D
NSN5310-00-904-0743
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 2640-402X3PC9 · 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: 0.874 INCHES NOMINAL IN
•
HARDNESS RATING: 75.0 ROCKWELL M MINIMUM
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
PERIPHERAL SHAPE STYLE: ROUND
•
MATERIAL: PLASTIC POLYAMIDE NYLON OVERALL
•
CENTER HOLE SHAPE STYLE: ROUND
•
HOLE DIAMETER: 0.629 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
OVERALL DIAMETER0.874 INCHES NOMINAL IN
HARDNESS RATING75.0 ROCKWELL M MINIMUM
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
PERIPHERAL SHAPE STYLEROUND
END ITEM IDENTIFICATIONNIMITZ CLASS CVN; LOS ANGELES CLASS SSN (688); WASP CLASS LHD; FORRESTAL CLASS CV
MATERIALPLASTIC POLYAMIDE NYLON OVERALL
CENTER HOLE SHAPE STYLEROUND
HOLE DIAMETER0.629 INCHES NOMINAL IN
THICKNESS0.063 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES 7
205107PC9Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
2640-404X3 PIECReference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
SS845-2050967 PReference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
2640-787X3 PIECReference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
2640-809X40 PIEReference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
845-2050999PC22Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 2640-402X3PC9?
2640-402X3PC9 is a WASHER,FLAT.
What parts can replace 2640-402X3PC9?
There are 7 known substitutes for 2640-402X3PC9: 205107PC9, 2640-404X3 PIEC, SS845-2050967 P and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 2640-402X3PC9?
2640-402X3PC9 is cataloged in the U.S. Government catalog under NSN 5310-00-904-0743. 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.