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8756978 — WASHER,KEY

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

8756978: WASHER,KEY.

The WASHER,KEY is a the manufacturer industrial component. Key specifications include material: STEEL COMP 1009 OR STEEL COMP 1015 OR STEEL COMP 1018 OR STEEL COMP 1020 OR STEEL COMP 1025 OVERALL, hole_diameter: 0.328 INCHES MINIMUM AND 0.360 INCHES MAXIMUM IN, outside_diameter: 0.562 INCHES NOMINAL IN, style_designator: KEY, surface_treatment: CADMIUM OVERALL, material_thickness: 0.042 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-655-9669, 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
8756978
NSN: 5310-00-655-9669
FSC: 5310 — Nuts and Washers
CAGE: 19207 — U S ARMY TANK AUTOMOTIVE COMMAND AMSTA-IM-MM (USA)
SPECIFICATIONS
materialSTEEL COMP 1009 OR STEEL COMP 1015 OR STEEL COMP 1018 OR STEEL COMP 1020 OR STEEL COMP 1025 OVERALL
hole_diameter0.328 INCHES MINIMUM AND 0.360 INCHES MAXIMUM IN
outside_diameter0.562 INCHES NOMINAL IN
style_designatorKEY
surface_treatmentCADMIUM OVERALL
material_thickness0.042 INCHES NOMINAL IN
peening_key_length0.281 INCHES NOMINAL IN
external_straight_key_width0.250 INCHES NOMINAL IN
external_straight_key_length0.219 INCHES NOMINAL IN
overall_distance_including_keys1.000 INCHES NOMINAL IN
surface_treatment_document_and_classificationQQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN5310-00-655-9669
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 8756978 · 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
•
EXTERNAL STRAIGHT KEY LENGTH: 0.219 INCHES NOMINAL IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
OVERALL DISTANCE INCLUDING KEYS: 1.000 INCHES NOMINAL IN
•
STYLE DESIGNATOR: KEY
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-698 FED SPEC 1ST MATERIAL RESPONSE OR QQ-S-698 FED SPEC 2ND MATERIAL RESPONSE OR QQ-S-698 FED SPEC 3RD MATERIAL RESPONSE OR QQ-S-698 FED SPEC 4TH MATERIAL RESPONSE OR QQ-S-700 FED SPEC 5TH MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 0.562 INCHES NOMINAL IN
•
PEENING KEY LENGTH: 0.281 INCHES NOMINAL IN
•
MATERIAL THICKNESS: 0.042 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
EXTERNAL STRAIGHT KEY LENGTH0.219 INCHES NOMINAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
OVERALL DISTANCE INCLUDING KEYS1.000 INCHES NOMINAL IN
STYLE DESIGNATORKEY
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-698 FED SPEC 1ST MATERIAL RESPONSE OR QQ-S-698 FED SPEC 2ND MATERIAL RESPONSE OR QQ-S-698 FED SPEC 3RD MATERIAL RESPONSE OR QQ-S-698 FED SPEC 4TH MATERIAL RESPONSE OR QQ-S-700 FED SPEC 5TH MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER0.562 INCHES NOMINAL IN
PEENING KEY LENGTH0.281 INCHES NOMINAL IN
MATERIAL THICKNESS0.042 INCHES NOMINAL IN
EXTERNAL STRAIGHT KEY WIDTH0.250 INCHES NOMINAL IN
SURFACE TREATMENTCADMIUM OVERALL
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 3
K9669Reference document
Same NSN cross-reference
Reference document — NATO reproduction reference
8876040Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
5310006559669Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 8756978?
8756978 is a WASHER,KEY.
What parts can replace 8756978?
There are 3 known substitutes for 8756978: K9669, 8876040, 5310006559669. Substitute compatibility should be verified for your specific system.
What is the NSN for 8756978?
8756978 is cataloged in the U.S. Government catalog under NSN 5310-00-655-9669. 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.