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04-21766 — WASHER,FLAT

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

04-21766: WASHER,FLAT.

The WASHER,FLAT is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, hole_diameter: 22.50 INCHES MINIMUM AND 22.63 INCHES MAXIMUM IN, overall_diameter: 24.40 INCHES MINIMUM AND 27.60 INCHES MAXIMUM IN, peripheral_shape_style: ROUND, center_hole_shape_style: ROUND, end_item_identification: 6115015617329. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-617-7577, 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
04-21766
NSN: 5310-01-617-7577
FSC: 5310 — Nuts and Washers
CAGE: 30554 — DEPARTMENT OF DEFENSE PROJECT MANAGER-MOBILE ELECTRIC POWER (USA)
SPECIFICATIONS
materialSTEEL OVERALL
hole_diameter22.50 INCHES MINIMUM AND 22.63 INCHES MAXIMUM IN
overall_diameter24.40 INCHES MINIMUM AND 27.60 INCHES MAXIMUM IN
peripheral_shape_styleROUND
center_hole_shape_styleROUND
end_item_identification6115015617329
cross-sectional_shape_styleRECTANGULAR
material_document_and_classificationASTM A 1008 CS TYPE B ASSN STD SINGLE MATERIAL RESPONSE OVERALL
part_name_assigned_by_controlling_agencyWASHER, FLAT
NSN5310-01-617-7577
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 04-21766 · 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: 24.40 INCHES MINIMUM AND 27.60 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASTM A 1008 CS TYPE B ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
PERIPHERAL SHAPE STYLE: ROUND
•
MATERIAL: STEEL OVERALL
•
CENTER HOLE SHAPE STYLE: ROUND
TECHNICAL CHARACTERISTICS
OVERALL DIAMETER24.40 INCHES MINIMUM AND 27.60 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONASTM A 1008 CS TYPE B ASSN STD SINGLE MATERIAL RESPONSE OVERALL
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
PERIPHERAL SHAPE STYLEROUND
PART NAME ASSIGNED BY CONTROLLING AGENCYWASHER, FLAT
END ITEM IDENTIFICATION6115015617329
MATERIALSTEEL OVERALL
CENTER HOLE SHAPE STYLEROUND
HOLE DIAMETER22.50 INCHES MINIMUM AND 22.63 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
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 04-21766?
04-21766 is a WASHER,FLAT.
What is the NSN for 04-21766?
04-21766 is cataloged in the U.S. Government catalog under NSN 5310-01-617-7577. This indicates validated use in U.S. government and defense supply chains.
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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.