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A51B25563-11 — WASHER,FLAT

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

A51B25563-11: WASHER,FLAT.

The WASHER,FLAT is a the manufacturer industrial component. Key specifications include width: 0.800 INCHES NOMINAL IN, length: 0.850 INCHES NOMINAL IN, thickness: 0.125 INCHES NOMINAL IN, hole_diameter: 0.378 INCHES MINIMUM AND 0.388 INCHES MAXIMUM IN, center_hole_width: 0.320 INCHES NOMINAL IN, center_hole_shape_style: DEE. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-007-0004, 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
A51B25563-11
NSN: 5310-00-007-0004
FSC: 5310 — Nuts and Washers
CAGE: 79RG9 — NORTHROP GRUMMAN SYSTEMS CORPORATION (USA)
SPECIFICATIONS
width0.800 INCHES NOMINAL IN
length0.850 INCHES NOMINAL IN
thickness0.125 INCHES NOMINAL IN
hole_diameter0.378 INCHES MINIMUM AND 0.388 INCHES MAXIMUM IN
center_hole_width0.320 INCHES NOMINAL IN
center_hole_shape_styleDEE
cross-sectional_shape_styleRECTANGULAR
NSN5310-00-007-0004
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: A51B25563-11 · 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 WIDTH: 0.320 INCHES NOMINAL IN
•
LENGTH: 0.850 INCHES NOMINAL IN
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
WIDTH: 0.800 INCHES NOMINAL IN
•
CENTER HOLE SHAPE STYLE: DEE
•
HOLE DIAMETER: 0.378 INCHES MINIMUM AND 0.388 INCHES MAXIMUM IN
•
THICKNESS: 0.125 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
CENTER HOLE WIDTH0.320 INCHES NOMINAL IN
LENGTH0.850 INCHES NOMINAL IN
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
WIDTH0.800 INCHES NOMINAL IN
CENTER HOLE SHAPE STYLEDEE
HOLE DIAMETER0.378 INCHES MINIMUM AND 0.388 INCHES MAXIMUM IN
THICKNESS0.125 INCHES NOMINAL 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: Terminal item — stock exhausted; no further procurementNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is A51B25563-11?
A51B25563-11 is a WASHER,FLAT.
What is the NSN for A51B25563-11?
A51B25563-11 is cataloged in the U.S. Government catalog under NSN 5310-00-007-0004. 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.