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Technical Data Sheet
305259 ✓ Verified by PartsTable
· NUT WASHER
WHAT YOU NEED TO KNOW
Match nut grade to bolt grade for full strength Lock nuts prevent loosening under vibration
Don't mix grades — weakens the joint
PRODUCT OVERVIEW

The WASHER,FLAT is a the manufacturer industrial component. Key specifications include height: 0.250 INCHES NOMINAL IN, material: STEEL, outside_diameter: 1.252 INCHES MINIMUM AND 1.255 INCHES MAXIMUM IN, special_features: OUTSIDE EDGE CHAMFERED,1/16 IN. BY 15 DEG ON OPEN END IN, style_designator: CUP, material_thickness: 0.0359 INCHES NOMINAL IN.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-012-0391, 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
305259
NSN: 5310-00-012-0391
FSC: 5310
CAGE: 56232 — LOCKHEED MARTIN CORPORATION DIV RMS - MITCHEL FIELD (USA)
SPECIFICATIONS
height0.250 INCHES NOMINAL IN
materialSTEEL
outside_diameter1.252 INCHES MINIMUM AND 1.255 INCHES MAXIMUM IN
special_featuresOUTSIDE EDGE CHAMFERED,1/16 IN. BY 15 DEG ON OPEN END IN
style_designatorCUP
material_thickness0.0359 INCHES NOMINAL IN
material_document_and_classificationQQ-S-00640, FS-0 FED SPEC SINGLE MATERIAL RESPONSE
NSN5310-00-012-0391
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 305259 · 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 SHAPE STYLE: ROUND
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-634 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NONDEFINITIVE SPEC/STD DATA: A TYPE
MATERIAL: STEEL COMP 1010 OVERALL
DEPARTURE FROM CITED DOCUMENT: AS MOD BY SURF
SURFACE TREATMENT: CADMIUM OR ZINC OVERALL
THICKNESS: 0.049 INCHES NOMINAL IN
PERIPHERAL SHAPE STYLE: ROUND
TECHNICAL CHARACTERISTICS (FLIS)
CENTER HOLE SHAPE STYLEROUND
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-634 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NONDEFINITIVE SPEC/STD DATAA TYPE
MATERIALSTEEL COMP 1010 OVERALL
DEPARTURE FROM CITED DOCUMENTAS MOD BY SURF
SURFACE TREATMENTCADMIUM OR ZINC OVERALL
THICKNESS0.049 INCHES NOMINAL IN
PERIPHERAL SHAPE STYLEROUND
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
HOLE DIAMETER0.218 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 27
P103Interchangeable
interchangeable cross-reference
interchangeable
347462Interchangeable
interchangeable cross-reference
interchangeable
BEBX1M1Interchangeable
interchangeable cross-reference
interchangeable
FFW92TYPEAGRADE1CLASSASIZE10Interchangeable
interchangeable cross-reference
interchangeable
5310PL0656425Interchangeable
interchangeable cross-reference
interchangeable
MS27183-42Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 305259?
305259 is a WASHER,FLAT.
What parts can replace 305259?
There are 27 known substitutes for 305259: P103, 347462, BEBX1M1 and 24 more. Substitute compatibility should be verified for your specific system.
Is 305259 still available?
305259 is currently cancelled.
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