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C7508-4 — WASHER,FINISHING

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

C7508-4: WASHER,FINISHING.

The WASHER,FINISHING is a the manufacturer industrial component. Key specifications include material: STEEL COMP 304 OR STEEL COMP 303 OVERALL, recess_angle: 99.0 DEGREES MINIMUM AND 102.0 DEGREES MAXIMUM, hole_diameter: 0.252 INCHES MINIMUM AND 0.262 INCHES MAXIMUM IN, overall_height: 0.112 INCHES NOMINAL IN, recess_diameter: 0.395 INCHES MINIMUM AND 0.405 INCHES MAXIMUM IN, outside_diameter: 0.625 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-076-4966, 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
C7508-4
NSN: 5310-01-076-4966
FSC: 5310 — Nuts and Washers
CAGE: 81755 — LOCKHEED MARTIN CORPORATION DIV LOCKHEED MARTIN AERONAUTICS COMPANY (USA)
SPECIFICATIONS
materialSTEEL COMP 304 OR STEEL COMP 303 OVERALL
recess_angle99.0 DEGREES MINIMUM AND 102.0 DEGREES MAXIMUM
hole_diameter0.252 INCHES MINIMUM AND 0.262 INCHES MAXIMUM IN
overall_height0.112 INCHES NOMINAL IN
recess_diameter0.395 INCHES MINIMUM AND 0.405 INCHES MAXIMUM IN
outside_diameter0.625 INCHES NOMINAL IN
style_designatorFINISHING
surface_treatmentPASSIVATE OVERALL
material_thickness0.023 INCHES MINIMUM AND 0.027 INCHES MAXIMUM IN
specification/standard_data81755-C7508 MANUFACTURERS SPECIFICATION CONTROL
material_document_and_classificationQQ-S-766 FED SPEC 1ST MATERIAL RESPONSE OR 66 FED STD 2ND MATERIAL RESPONSE OVERALL
surface_treatment_document_and_classificationQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN5310-01-076-4966
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: C7508-4 · 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: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
STYLE DESIGNATOR: FINISHING
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-766 FED SPEC 1ST MATERIAL RESPONSE OR 66 FED STD 2ND MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 0.625 INCHES NOMINAL IN
•
MATERIAL THICKNESS: 0.023 INCHES MINIMUM AND 0.027 INCHES MAXIMUM IN
•
SPECIFICATION/STANDARD DATA: 81755-C7508 MANUFACTURERS SPECIFICATION CONTROL
•
RECESS DIAMETER: 0.395 INCHES MINIMUM AND 0.405 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.112 INCHES NOMINAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
STYLE DESIGNATORFINISHING
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-766 FED SPEC 1ST MATERIAL RESPONSE OR 66 FED STD 2ND MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER0.625 INCHES NOMINAL IN
MATERIAL THICKNESS0.023 INCHES MINIMUM AND 0.027 INCHES MAXIMUM IN
SPECIFICATION/STANDARD DATA81755-C7508 MANUFACTURERS SPECIFICATION CONTROL
RECESS DIAMETER0.395 INCHES MINIMUM AND 0.405 INCHES MAXIMUM IN
SURFACE TREATMENTPASSIVATE OVERALL
MATERIALSTEEL COMP 304 OR STEEL COMP 303 OVERALL
SUBSTITUTES & CROSS-REFERENCES 3
5310PL0748738Reference document
Same NSN cross-reference
Reference document — Informative reference only
AS64Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
5310PL1674094Reference document
Same NSN cross-reference
Reference document — Informative reference only
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is C7508-4?
C7508-4 is a WASHER,FINISHING.
What parts can replace C7508-4?
There are 3 known substitutes for C7508-4: 5310PL0748738, AS64, 5310PL1674094. Substitute compatibility should be verified for your specific system.
What is the NSN for C7508-4?
C7508-4 is cataloged in the U.S. Government catalog under NSN 5310-01-076-4966. 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.