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SI668A9G — WASHER,FINISHING

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

SI668A9G: WASHER,FINISHING.

The WASHER,FINISHING is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY 2024 OVERALL, recess_angle: 100.0 DEGREES NOMINAL, hole_diameter: 0.159 INCHES MINIMUM AND 0.169 INCHES MAXIMUM IN, overall_height: 0.062 INCHES MINIMUM AND 0.078 INCHES MAXIMUM IN, recess_diameter: 0.312 INCHES MINIMUM AND 0.328 INCHES MAXIMUM IN, outside_diameter: 0.562 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-053-2897, 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
SI668A9G
NSN: 5310-01-053-2897
FSC: 5310 — Nuts and Washers
CAGE: 24434 — SKYLINE INDUSTRIES, INC (USA)
SPECIFICATIONS
materialALUMINUM ALLOY 2024 OVERALL
recess_angle100.0 DEGREES NOMINAL
hole_diameter0.159 INCHES MINIMUM AND 0.169 INCHES MAXIMUM IN
overall_height0.062 INCHES MINIMUM AND 0.078 INCHES MAXIMUM IN
recess_diameter0.312 INCHES MINIMUM AND 0.328 INCHES MAXIMUM IN
outside_diameter0.562 INCHES NOMINAL IN
style_designatorFINISHING
surface_treatmentANODIZE OVERALL
material_thickness0.010 INCHES NOMINAL IN
material_document_and_classificationQQ-A-362,T3,T4 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
surface_treatment_document_and_classificationFED-STD-595 FED STD SINGLE TREATMENT RESPONSE OVERALL
NSN5310-01-053-2897
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: SI668A9G · 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: FED-STD-595 FED STD SINGLE TREATMENT RESPONSE OVERALL
•
STYLE DESIGNATOR: FINISHING
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-A-362,T3,T4 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 0.562 INCHES NOMINAL IN
•
MATERIAL THICKNESS: 0.010 INCHES NOMINAL IN
•
RECESS DIAMETER: 0.312 INCHES MINIMUM AND 0.328 INCHES MAXIMUM IN
•
COLOR: GRAY/GREY OVERALL
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.062 INCHES MINIMUM AND 0.078 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONFED-STD-595 FED STD SINGLE TREATMENT RESPONSE OVERALL
STYLE DESIGNATORFINISHING
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-A-362,T3,T4 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER0.562 INCHES NOMINAL IN
MATERIAL THICKNESS0.010 INCHES NOMINAL IN
RECESS DIAMETER0.312 INCHES MINIMUM AND 0.328 INCHES MAXIMUM IN
COLORGRAY/GREY OVERALL
SURFACE TREATMENTANODIZE OVERALL
MATERIALALUMINUM ALLOY 2024 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 2
5310PL0743326Reference document
Same NSN cross-reference
Reference document — Informative reference only
C668A9GReference document
Same NSN cross-reference
Reference document — Vendor item drawing reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is SI668A9G?
SI668A9G is a WASHER,FINISHING.
What parts can replace SI668A9G?
There are 2 known substitutes for SI668A9G: 5310PL0743326, C668A9G. Substitute compatibility should be verified for your specific system.
What is the NSN for SI668A9G?
SI668A9G is cataloged in the U.S. Government catalog under NSN 5310-01-053-2897. 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.