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C668C7 — WASHER,FINISHING

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

C668C7: WASHER,FINISHING.

The WASHER,FINISHING is a the manufacturer industrial component. Key specifications include material: STEEL COMP 301 OVERALL, recess_angle: 100.0 DEGREES NOMINAL, hole_diameter: 0.107 INCHES MINIMUM AND 0.117 INCHES MAXIMUM IN, overall_height: 0.040 INCHES MINIMUM AND 0.056 INCHES MAXIMUM IN, recess_diameter: 0.234 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN, outside_diameter: 0.437 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-107-5174, 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
C668C7
NSN: 5310-01-107-5174
FSC: 5310 — Nuts and Washers
CAGE: 81755 — LOCKHEED MARTIN CORPORATION DIV LOCKHEED MARTIN AERONAUTICS COMPANY (USA)
SPECIFICATIONS
materialSTEEL COMP 301 OVERALL
recess_angle100.0 DEGREES NOMINAL
hole_diameter0.107 INCHES MINIMUM AND 0.117 INCHES MAXIMUM IN
overall_height0.040 INCHES MINIMUM AND 0.056 INCHES MAXIMUM IN
recess_diameter0.234 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN
outside_diameter0.437 INCHES NOMINAL IN
style_designatorFINISHING
material_thickness0.016 INCHES NOMINAL IN
material_document_and_classificationMIL-S-5059,COND 1/2 HARD MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5310-01-107-5174
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: C668C7 · 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
•
STYLE DESIGNATOR: FINISHING
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-5059,COND 1/2 HARD MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 0.437 INCHES NOMINAL IN
•
MATERIAL THICKNESS: 0.016 INCHES NOMINAL IN
•
RECESS DIAMETER: 0.234 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN
•
MATERIAL: STEEL COMP 301 OVERALL
•
HOLE DIAMETER: 0.107 INCHES MINIMUM AND 0.117 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.040 INCHES MINIMUM AND 0.056 INCHES MAXIMUM IN
STYLE DESIGNATORFINISHING
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-5059,COND 1/2 HARD MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER0.437 INCHES NOMINAL IN
MATERIAL THICKNESS0.016 INCHES NOMINAL IN
RECESS DIAMETER0.234 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN
MATERIALSTEEL COMP 301 OVERALL
HOLE DIAMETER0.107 INCHES MINIMUM AND 0.117 INCHES MAXIMUM IN
RECESS ANGLE100.0 DEGREES NOMINAL
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 C668C7?
C668C7 is a WASHER,FINISHING.
What is the NSN for C668C7?
C668C7 is cataloged in the U.S. Government catalog under NSN 5310-01-107-5174. 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.