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7651978 — WASHER,KEY

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

7651978: WASHER,KEY.

The WASHER,KEY is a the manufacturer industrial component. Key specifications include material: STEEL COMP 1022 OVERALL, hole_diameter: 0.376 INCHES MINIMUM AND 0.378 INCHES MAXIMUM IN, surface_finish: 63.0 MICROINCHES INNER, outside_diameter: 0.463 INCHES MINIMUM AND 0.473 INCHES MAXIMUM IN, style_designator: KEY, surface_treatment: PHOSPHATE OVERALL. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-765-1978, 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
7651978
NSN: 5310-00-765-1978
FSC: 5310 — Nuts and Washers
CAGE: 19200 — COMBAT CAPABILITIES DEVELOPMENT COMMAND (CCDC) ARMAMENTS CENTER DBA CCDC DIV LOGISTICS RESEARCH AND ENGINEERING DIRECTORATE (USA)
SPECIFICATIONS
materialSTEEL COMP 1022 OVERALL
hole_diameter0.376 INCHES MINIMUM AND 0.378 INCHES MAXIMUM IN
surface_finish63.0 MICROINCHES INNER
outside_diameter0.463 INCHES MINIMUM AND 0.473 INCHES MAXIMUM IN
style_designatorKEY
surface_treatmentPHOSPHATE OVERALL
material_thickness0.035 INCHES NOMINAL IN
external_prebent_key_width0.148 INCHES MINIMUM AND 0.158 INCHES MAXIMUM IN
external_prebent_key_length0.078 INCHES MINIMUM AND 0.083 INCHES MAXIMUM IN
overall_distance_including_keys0.5685 INCHES MINIMUM AND 0.5785 INCHES MAXIMUM IN
material_document_and_classificationQQ-S-698 FED SPEC 1ST MATERIAL RESPONSE OR QQ-S-700 FED SPEC 2ND MATERIAL RESPONSE OVERALL
distance_from_centerline_to_inside_of_prebent_key0.308 INCHES NOMINAL IN
NSN5310-00-765-1978
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 7651978 · 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 FINISH: 63.0 MICROINCHES INNER
•
DISTANCE FROM CENTERLINE TO INSIDE OF PREBENT KEY: 0.308 INCHES NOMINAL IN
•
EXTERNAL PREBENT KEY LENGTH: 0.078 INCHES MINIMUM AND 0.083 INCHES MAXIMUM IN
•
OVERALL DISTANCE INCLUDING KEYS: 0.5685 INCHES MINIMUM AND 0.5785 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: KEY
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-698 FED SPEC 1ST MATERIAL RESPONSE OR QQ-S-700 FED SPEC 2ND MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 0.463 INCHES MINIMUM AND 0.473 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.035 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
SURFACE FINISH63.0 MICROINCHES INNER
DISTANCE FROM CENTERLINE TO INSIDE OF PREBENT KEY0.308 INCHES NOMINAL IN
EXTERNAL PREBENT KEY LENGTH0.078 INCHES MINIMUM AND 0.083 INCHES MAXIMUM IN
OVERALL DISTANCE INCLUDING KEYS0.5685 INCHES MINIMUM AND 0.5785 INCHES MAXIMUM IN
STYLE DESIGNATORKEY
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-698 FED SPEC 1ST MATERIAL RESPONSE OR QQ-S-700 FED SPEC 2ND MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER0.463 INCHES MINIMUM AND 0.473 INCHES MAXIMUM IN
MATERIAL THICKNESS0.035 INCHES NOMINAL IN
SURFACE TREATMENTPHOSPHATE OVERALL
EXTERNAL PREBENT KEY WIDTH0.148 INCHES MINIMUM AND 0.158 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
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 7651978?
7651978 is a WASHER,KEY.
What is the NSN for 7651978?
7651978 is cataloged in the U.S. Government catalog under NSN 5310-00-765-1978. This indicates validated use in U.S. government and defense supply chains.
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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.