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370779 — WASHER,KEY

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

370779: WASHER,KEY.

The WASHER,KEY is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, hole_diameter: 0.186 INCHES MINIMUM AND 0.206 INCHES MAXIMUM IN, outside_diameter: 0.560 INCHES MINIMUM AND 0.580 INCHES MAXIMUM IN, surface_treatment: CADMIUM OVERALL, material_thickness: 0.022 INCHES MINIMUM AND 0.028 INCHES MAXIMUM IN, external_prebent_key_width: 0.300 INCHES MINIMUM AND 0.320 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-987-2827, 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
370779
NSN: 5310-00-987-2827
FSC: 5310 — Nuts and Washers
CAGE: 77445 — RTX CORPORATION DBA PRATT & WHITNEY DIV PRATT &WHITNEY (USA)
SPECIFICATIONS
materialSTEEL OVERALL
hole_diameter0.186 INCHES MINIMUM AND 0.206 INCHES MAXIMUM IN
outside_diameter0.560 INCHES MINIMUM AND 0.580 INCHES MAXIMUM IN
surface_treatmentCADMIUM OVERALL
material_thickness0.022 INCHES MINIMUM AND 0.028 INCHES MAXIMUM IN
external_key_quantity1
external_prebent_key_width0.300 INCHES MINIMUM AND 0.320 INCHES MAXIMUM IN
external_prebent_key_length0.062 INCHES MINIMUM AND 0.088 INCHES MAXIMUM IN
material_document_and_classificationAMS5040 ASSN STD SINGLE MATERIAL RESPONSE OR AMS5042 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
surface_treatment_document_and_classificationAMS2400 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
NSN5310-00-987-2827
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 370779 · 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
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: AMS2400 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
•
EXTERNAL PREBENT KEY LENGTH: 0.062 INCHES MINIMUM AND 0.088 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS5040 ASSN STD SINGLE MATERIAL RESPONSE OR AMS5042 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 0.560 INCHES MINIMUM AND 0.580 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.022 INCHES MINIMUM AND 0.028 INCHES MAXIMUM IN
•
EXTERNAL KEY QUANTITY: 1
•
SURFACE TREATMENT: CADMIUM OVERALL
•
EXTERNAL PREBENT KEY WIDTH: 0.300 INCHES MINIMUM AND 0.320 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONAMS2400 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
EXTERNAL PREBENT KEY LENGTH0.062 INCHES MINIMUM AND 0.088 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONAMS5040 ASSN STD SINGLE MATERIAL RESPONSE OR AMS5042 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER0.560 INCHES MINIMUM AND 0.580 INCHES MAXIMUM IN
MATERIAL THICKNESS0.022 INCHES MINIMUM AND 0.028 INCHES MAXIMUM IN
EXTERNAL KEY QUANTITY1
SURFACE TREATMENTCADMIUM OVERALL
EXTERNAL PREBENT KEY WIDTH0.300 INCHES MINIMUM AND 0.320 INCHES MAXIMUM IN
MATERIALSTEEL OVERALL
HOLE DIAMETER0.186 INCHES MINIMUM AND 0.206 INCHES MAXIMUM 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: Semi-active item — no replacement plannedNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 370779?
370779 is a WASHER,KEY.
What is the NSN for 370779?
370779 is cataloged in the U.S. Government catalog under NSN 5310-00-987-2827. 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.