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12280903 — WASHER,FLAT

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

12280903: WASHER,FLAT.

The WASHER,FLAT is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, thickness: 0.159 INCHES MINIMUM AND 0.199 INCHES MAXIMUM IN, hole_diameter: 1.005 INCHES MINIMUM AND 1.015 INCHES MAXIMUM IN, center_hole_width: 0.943 INCHES MINIMUM AND 0.953 INCHES MAXIMUM IN, surface_treatment: TIN OVERALL, width_across_flats: 1.980 INCHES MINIMUM AND 2.020 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-337-6049, 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
12280903
NSN: 5310-01-337-6049
FSC: 5310 — Nuts and Washers
CAGE: 19200 — COMBAT CAPABILITIES DEVELOPMENT COMMAND (CCDC) ARMAMENTS CENTER DBA CCDC DIV LOGISTICS RESEARCH AND ENGINEERING DIRECTORATE (USA)
SPECIFICATIONS
materialSTEEL OVERALL
thickness0.159 INCHES MINIMUM AND 0.199 INCHES MAXIMUM IN
hole_diameter1.005 INCHES MINIMUM AND 1.015 INCHES MAXIMUM IN
center_hole_width0.943 INCHES MINIMUM AND 0.953 INCHES MAXIMUM IN
surface_treatmentTIN OVERALL
width_across_flats1.980 INCHES MINIMUM AND 2.020 INCHES MAXIMUM IN
peripheral_shape_styleSQUARE
center_hole_shape_styleDEE
cross-sectional_shape_styleRECTANGULAR
material_document_and_classificationQQ-S-698 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
surface_treatment_document_and_classificationMIL-T-10727,TY1 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN5310-01-337-6049
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 12280903 · 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
•
CENTER HOLE WIDTH: 0.943 INCHES MINIMUM AND 0.953 INCHES MAXIMUM IN
•
WIDTH ACROSS FLATS: 1.980 INCHES MINIMUM AND 2.020 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-T-10727,TY1 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-698 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
SURFACE TREATMENT: TIN OVERALL
•
PERIPHERAL SHAPE STYLE: SQUARE
•
MATERIAL: STEEL OVERALL
TECHNICAL CHARACTERISTICS
CENTER HOLE WIDTH0.943 INCHES MINIMUM AND 0.953 INCHES MAXIMUM IN
WIDTH ACROSS FLATS1.980 INCHES MINIMUM AND 2.020 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-T-10727,TY1 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-698 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
SURFACE TREATMENTTIN OVERALL
PERIPHERAL SHAPE STYLESQUARE
MATERIALSTEEL OVERALL
CENTER HOLE SHAPE STYLEDEE
HOLE DIAMETER1.005 INCHES MINIMUM AND 1.015 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

No substitute or cross-reference records for this part.

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 12280903?
12280903 is a WASHER,FLAT.
What is the NSN for 12280903?
12280903 is cataloged in the U.S. Government catalog under NSN 5310-01-337-6049. 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.