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378881-S — WASHER,KEY

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

378881-S: WASHER,KEY.

The WASHER,KEY is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, hole_diameter: 0.400 INCHES NOMINAL IN, outside_diameter: 0.640 INCHES NOMINAL IN, material_thickness: 0.054 INCHES MINIMUM AND 0.066 INCHES MAXIMUM IN, external_prebent_key_angle: 45.0 DEGREES NOMINAL, external_prebent_key_width: 0.180 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-102-7366, 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
378881-S
NSN: 5310-01-102-7366
FSC: 5310 — Nuts and Washers
CAGE: 00501 — NEW HOLLAND N.V.NC. (USA)
SPECIFICATIONS
materialSTEEL OVERALL
hole_diameter0.400 INCHES NOMINAL IN
outside_diameter0.640 INCHES NOMINAL IN
material_thickness0.054 INCHES MINIMUM AND 0.066 INCHES MAXIMUM IN
external_prebent_key_angle45.0 DEGREES NOMINAL
external_prebent_key_width0.180 INCHES NOMINAL IN
NSN5310-01-102-7366
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 378881-S · 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
•
OUTSIDE DIAMETER: 0.640 INCHES NOMINAL IN
•
MATERIAL THICKNESS: 0.054 INCHES MINIMUM AND 0.066 INCHES MAXIMUM IN
•
EXTERNAL PREBENT KEY ANGLE: 45.0 DEGREES NOMINAL
•
EXTERNAL PREBENT KEY WIDTH: 0.180 INCHES NOMINAL IN
•
MATERIAL: STEEL OVERALL
•
HOLE DIAMETER: 0.400 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
OUTSIDE DIAMETER0.640 INCHES NOMINAL IN
MATERIAL THICKNESS0.054 INCHES MINIMUM AND 0.066 INCHES MAXIMUM IN
EXTERNAL PREBENT KEY ANGLE45.0 DEGREES NOMINAL
EXTERNAL PREBENT KEY WIDTH0.180 INCHES NOMINAL IN
MATERIALSTEEL OVERALL
HOLE DIAMETER0.400 INCHES NOMINAL IN
OTHER ITEMS IN FSC 5310 — Nuts and Washers
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5310-00-000-0040 5310-00-000-0077 5310-00-000-0079 5310-00-000-1146 5310-00-000-3815 5310-00-000-4532 5310-00-000-4540
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 378881-S?
378881-S is a WASHER,KEY.
What is the NSN for 378881-S?
378881-S is cataloged in the U.S. Government catalog under NSN 5310-01-102-7366. 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.