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238780 — WASHER,FLAT

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

238780: WASHER,FLAT.

The WASHER,FLAT is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, thickness: 0.120 INCHES MINIMUM AND 0.130 INCHES MAXIMUM IN, hole_diameter: 1.250 INCHES NOMINAL IN, hardness_rating: 90.0 ROCKWELL SUPERFICIAL 15-N MINIMUM, overall_diameter: 1.845 INCHES NOMINAL IN, features_provided: CASEHARDENED. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-857-5263, 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
238780
NSN: 5310-00-857-5263
FSC: 5310 — Nuts and Washers
CAGE: 62983 — EATON AEROSPACE, LLC DBA JACKSON SOUTH (USA)
SPECIFICATIONS
materialSTEEL OVERALL
thickness0.120 INCHES MINIMUM AND 0.130 INCHES MAXIMUM IN
hole_diameter1.250 INCHES NOMINAL IN
hardness_rating90.0 ROCKWELL SUPERFICIAL 15-N MINIMUM
overall_diameter1.845 INCHES NOMINAL IN
features_providedCASEHARDENED
peripheral_shape_styleROUND
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
NSN5310-00-857-5263
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 238780 · 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: 1.845 INCHES NOMINAL IN
•
HARDNESS RATING: 90.0 ROCKWELL SUPERFICIAL 15-N MINIMUM
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
FEATURES PROVIDED: CASEHARDENED
•
PERIPHERAL SHAPE STYLE: ROUND
•
MATERIAL: STEEL OVERALL
•
CENTER HOLE SHAPE STYLE: ROUND
•
HOLE DIAMETER: 1.250 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
OVERALL DIAMETER1.845 INCHES NOMINAL IN
HARDNESS RATING90.0 ROCKWELL SUPERFICIAL 15-N MINIMUM
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
FEATURES PROVIDEDCASEHARDENED
PERIPHERAL SHAPE STYLEROUND
MATERIALSTEEL OVERALL
CENTER HOLE SHAPE STYLEROUND
HOLE DIAMETER1.250 INCHES NOMINAL IN
THICKNESS0.120 INCHES MINIMUM AND 0.130 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: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 238780?
238780 is a WASHER,FLAT.
What is the NSN for 238780?
238780 is cataloged in the U.S. Government catalog under NSN 5310-00-857-5263. 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.