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11780253 — WASHER,CONCAVE

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

11780253: WASHER,CONCAVE.

The WASHER,CONCAVE is a the manufacturer industrial component. Key specifications include radius: 1.000 INCHES NOMINAL IN, material: STEEL OVERALL, hole_diameter: 0.301 INCHES MINIMUM AND 0.308 INCHES MAXIMUM IN, surface_finish: 63.0 MICROINCHES ALL SURFACES, recess_diameter: 0.524 INCHES NOMINAL IN, outside_diameter: 0.720 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-076-2317, 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
11780253
NSN: 5310-01-076-2317
FSC: 5310 — Nuts and Washers
CAGE: 19200 — COMBAT CAPABILITIES DEVELOPMENT COMMAND (CCDC) ARMAMENTS CENTER DBA CCDC DIV LOGISTICS RESEARCH AND ENGINEERING DIRECTORATE (USA)
SPECIFICATIONS
radius1.000 INCHES NOMINAL IN
materialSTEEL OVERALL
hole_diameter0.301 INCHES MINIMUM AND 0.308 INCHES MAXIMUM IN
surface_finish63.0 MICROINCHES ALL SURFACES
recess_diameter0.524 INCHES NOMINAL IN
outside_diameter0.720 INCHES NOMINAL IN
style_designatorCONCAVE
surface_treatmentPASSIVATE OVERALL
material_thickness0.060 INCHES MINIMUM AND 0.070 INCHES MAXIMUM IN
end_item_identificationARMAMENT SUBSYSTEM XM97E2
material_document_and_classificationQQ-S-764 COND B MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5310-01-076-2317
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 11780253 · 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 FINISH: 63.0 MICROINCHES ALL SURFACES
•
RADIUS: 1.000 INCHES NOMINAL IN
•
STYLE DESIGNATOR: CONCAVE
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-764 COND B MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 0.720 INCHES NOMINAL IN
•
MATERIAL THICKNESS: 0.060 INCHES MINIMUM AND 0.070 INCHES MAXIMUM IN
•
RECESS DIAMETER: 0.524 INCHES NOMINAL IN
•
SURFACE TREATMENT: PASSIVATE OVERALL
TECHNICAL CHARACTERISTICS
SURFACE FINISH63.0 MICROINCHES ALL SURFACES
RADIUS1.000 INCHES NOMINAL IN
STYLE DESIGNATORCONCAVE
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-764 COND B MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER0.720 INCHES NOMINAL IN
MATERIAL THICKNESS0.060 INCHES MINIMUM AND 0.070 INCHES MAXIMUM IN
RECESS DIAMETER0.524 INCHES NOMINAL IN
SURFACE TREATMENTPASSIVATE OVERALL
END ITEM IDENTIFICATIONARMAMENT SUBSYSTEM XM97E2
MATERIALSTEEL OVERALL
SUBSTITUTES & CROSS-REFERENCES 1
42208-1Reference document
Same NSN cross-reference
Reference document — Secondary reference
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 11780253?
11780253 is a WASHER,CONCAVE.
What parts can replace 11780253?
There is 1 known substitute for 11780253: 42208-1. Substitute compatibility should be verified for your specific system.
What is the NSN for 11780253?
11780253 is cataloged in the U.S. Government catalog under NSN 5310-01-076-2317. 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.