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938.77.81.015 — WASHER,FLAT

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

938.77.81.015: WASHER,FLAT.

The WASHER,FLAT is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY 2024 OVERALL, thickness: 0.063 INCHES NOMINAL IN, hole_diameter: 0.255 INCHES MINIMUM AND 0.275 INCHES MAXIMUM IN, overall_diameter: 0.495 INCHES MINIMUM AND 0.520 INCHES MAXIMUM IN, surface_treatment: ANODIZE OVERALL, peripheral_shape_style: ROUND. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-145-3153, 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
938.77.81.015
NSN: 5310-01-145-3153
FSC: 5310 — Nuts and Washers
CAGE: S4080 — PILATUS AIRCRAFT LTD (CHE)
SPECIFICATIONS
materialALUMINUM ALLOY 2024 OVERALL
thickness0.063 INCHES NOMINAL IN
hole_diameter0.255 INCHES MINIMUM AND 0.275 INCHES MAXIMUM IN
overall_diameter0.495 INCHES MINIMUM AND 0.520 INCHES MAXIMUM IN
surface_treatmentANODIZE OVERALL
peripheral_shape_styleROUND
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
nondefinitive_spec/std_dataA TYPE AND 1 GRADE AND D CLASS
material_document_and_classificationQQ-A-250/5,TEMPER T3 FED SPEC SINGLE MATERIAL RESPONSE OR QQ-A-250/5,TEMPER T4 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
surface_treatment_document_and_classificationMIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN5310-01-145-3153
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 938.77.81.015 · 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: MIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
•
OVERALL DIAMETER: 0.495 INCHES MINIMUM AND 0.520 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-A-250/5,TEMPER T3 FED SPEC SINGLE MATERIAL RESPONSE OR QQ-A-250/5,TEMPER T4 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
NONDEFINITIVE SPEC/STD DATA: A TYPE AND 1 GRADE AND D CLASS
•
SURFACE TREATMENT: ANODIZE OVERALL
•
PERIPHERAL SHAPE STYLE: ROUND
•
MATERIAL: ALUMINUM ALLOY 2024 OVERALL
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
OVERALL DIAMETER0.495 INCHES MINIMUM AND 0.520 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-A-250/5,TEMPER T3 FED SPEC SINGLE MATERIAL RESPONSE OR QQ-A-250/5,TEMPER T4 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
NONDEFINITIVE SPEC/STD DATAA TYPE AND 1 GRADE AND D CLASS
SURFACE TREATMENTANODIZE OVERALL
PERIPHERAL SHAPE STYLEROUND
MATERIALALUMINUM ALLOY 2024 OVERALL
CENTER HOLE SHAPE STYLEROUND
HOLE DIAMETER0.255 INCHES MINIMUM AND 0.275 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 5
5310PL0804606Reference document
Same NSN cross-reference
Reference document — Informative reference only
5310PL2091898Reference document
Same NSN cross-reference
Reference document — Informative reference only
10620TC10-131Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
FF-W-92Reference document
Same NSN cross-reference
Reference document — Identification reference
AN960KD416Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 938.77.81.015?
938.77.81.015 is a WASHER,FLAT.
What parts can replace 938.77.81.015?
There are 5 known substitutes for 938.77.81.015: 5310PL0804606, 5310PL2091898, 10620TC10-131 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 938.77.81.015?
938.77.81.015 is cataloged in the U.S. Government catalog under NSN 5310-01-145-3153. 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.