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3913784028 — WASHER,FLAT

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

3913784028: WASHER,FLAT.

The WASHER,FLAT is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, thickness: 0.187 INCHES NOMINAL IN, hole_diameter: 0.650 INCHES NOMINAL IN, overall_diameter: 1.250 INCHES NOMINAL IN, peripheral_shape_style: ROUND, center_hole_shape_style: ROUND. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-254-2574, 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
3913784028
NSN: 5310-01-254-2574
NIINs: 012542574, 013140051, 015836298
FSC: 5310 — Nuts and Washers
CAGE: 13829 — PARKER HANNIFIN CORPORATION DIV CYLINDER DIVISION (USA)
SPECIFICATIONS
materialSTEEL OVERALL
thickness0.187 INCHES NOMINAL IN
hole_diameter0.650 INCHES NOMINAL IN
overall_diameter1.250 INCHES NOMINAL IN
peripheral_shape_styleROUND
center_hole_shape_styleROUND
end_item_identificationHYDRAULICS SYSTEMS GROUP
cross-sectional_shape_styleRECTANGULAR
part_name_assigned_by_controlling_agencyWASHER
NSN5310-01-254-2574
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 3913784028 · 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
•
OVERALL DIAMETER: 1.250 INCHES NOMINAL IN
•
HARDNESS RATING: 38.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM
•
MATERIAL DOCUMENT AND CLASSIFICATION: AISI ASSN STD ALL MATERIAL RESPONSES OVERALL
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
PERIPHERAL SHAPE STYLE: ROUND
•
CENTER HOLE SHAPE STYLE: ROUND
•
HOLE DIAMETER: 0.688 INCHES NOMINAL IN
•
THICKNESS: 0.187 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
OVERALL DIAMETER1.250 INCHES NOMINAL IN
HARDNESS RATING38.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM
MATERIAL DOCUMENT AND CLASSIFICATIONAISI ASSN STD ALL MATERIAL RESPONSES OVERALL
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
PERIPHERAL SHAPE STYLEROUND
CENTER HOLE SHAPE STYLEROUND
HOLE DIAMETER0.688 INCHES NOMINAL IN
THICKNESS0.187 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

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 3913784028?
3913784028 is a WASHER,FLAT.
What is the NSN for 3913784028?
3913784028 is cataloged in the U.S. Government catalog under NSN 5310-01-254-2574. 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.