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557377 — WASHER,KEY

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

557377: WASHER,KEY.

The WASHER,KEY is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING OVERALL, hole_diameter: 1.820 INCHES NOMINAL IN, outside_diameter: 2.470 INCHES NOMINAL IN, special_features: TWO PREBENT TABS, style_designator: KEY, material_thickness: 0.265 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-027-4718, 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
557377
NSN: 5310-00-027-4718
FSC: 5310 — Nuts and Washers
CAGE: 30201 — TREGO INC (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
hole_diameter1.820 INCHES NOMINAL IN
outside_diameter2.470 INCHES NOMINAL IN
special_featuresTWO PREBENT TABS
style_designatorKEY
material_thickness0.265 INCHES NOMINAL IN
internal_prebent_key_width0.255 INCHES NOMINAL IN
internal_prebent_key_length0.204 INCHES NOMINAL IN
distance_from_centerline_to_inside_of_prebent_key0.879 INCHES NOMINAL IN
NSN5310-00-027-4718
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 557377 · 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
•
DISTANCE FROM CENTERLINE TO INSIDE OF PREBENT KEY: 0.879 INCHES NOMINAL IN
•
INTERNAL PREBENT KEY WIDTH: 0.255 INCHES NOMINAL IN
•
STYLE DESIGNATOR: KEY
•
OUTSIDE DIAMETER: 2.470 INCHES NOMINAL IN
•
MATERIAL THICKNESS: 0.265 INCHES NOMINAL IN
•
INTERNAL PREBENT KEY LENGTH: 0.204 INCHES NOMINAL IN
•
MATERIAL: STEEL CORROSION RESISTING OVERALL
TECHNICAL CHARACTERISTICS
DISTANCE FROM CENTERLINE TO INSIDE OF PREBENT KEY0.879 INCHES NOMINAL IN
INTERNAL PREBENT KEY WIDTH0.255 INCHES NOMINAL IN
STYLE DESIGNATORKEY
OUTSIDE DIAMETER2.470 INCHES NOMINAL IN
MATERIAL THICKNESS0.265 INCHES NOMINAL IN
INTERNAL PREBENT KEY LENGTH0.204 INCHES NOMINAL IN
SPECIAL FEATURESTWO PREBENT TABS
MATERIALSTEEL CORROSION RESISTING OVERALL
HOLE DIAMETER1.820 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
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 557377?
557377 is a WASHER,KEY.
What is the NSN for 557377?
557377 is cataloged in the U.S. Government catalog under NSN 5310-00-027-4718. 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.