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03A158-18 — WASHER,FLAT

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

03A158-18: WASHER,FLAT.

The WASHER,FLAT is a the manufacturer industrial component. Key specifications include material: TITANIUM ALLOY UNS R56400 OVERALL, thickness: 0.0295 INCHES MINIMUM AND 0.0345 INCHES MAXIMUM IN, hole_diameter: 0.563 INCHES MINIMUM AND 0.566 INCHES MAXIMUM IN, surface_finish: 63.0 MICROINCHES ALL SURFACES, overall_diameter: 0.913 INCHES MINIMUM AND 0.917 INCHES MAXIMUM IN, peripheral_shape_style: ROUND. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-333-3795, 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
03A158-18
NSN: 5310-01-333-3795
FSC: 5310 — Nuts and Washers
CAGE: 1W025 — NORTHROP GRUMMAN SYSTEMS CORP DBA NORTHROP GRUMMAN COMPUTING SYSTEMS (USA)
SPECIFICATIONS
materialTITANIUM ALLOY UNS R56400 OVERALL
thickness0.0295 INCHES MINIMUM AND 0.0345 INCHES MAXIMUM IN
hole_diameter0.563 INCHES MINIMUM AND 0.566 INCHES MAXIMUM IN
surface_finish63.0 MICROINCHES ALL SURFACES
overall_diameter0.913 INCHES MINIMUM AND 0.917 INCHES MAXIMUM IN
peripheral_shape_styleROUND
center_hole_shape_styleROUND
minimum_tensile_strength125000 POUNDS PER SQUARE INCH LBS
cross-sectional_shape_styleRECTANGULAR
material_document_and_classificationAMS 4911 ASSN STD SINGLE MATERIAL RESPONSE AND AMS 4928 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NSN5310-01-333-3795
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 03A158-18 · 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
•
SURFACE FINISH: 63.0 MICROINCHES ALL SURFACES
•
OVERALL DIAMETER: 0.913 INCHES MINIMUM AND 0.917 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 4911 ASSN STD SINGLE MATERIAL RESPONSE AND AMS 4928 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
MINIMUM TENSILE STRENGTH: 125000 POUNDS PER SQUARE INCH LBS
•
PERIPHERAL SHAPE STYLE: ROUND
•
MATERIAL: TITANIUM ALLOY UNS R56400 OVERALL
•
CENTER HOLE SHAPE STYLE: ROUND
TECHNICAL CHARACTERISTICS
SURFACE FINISH63.0 MICROINCHES ALL SURFACES
OVERALL DIAMETER0.913 INCHES MINIMUM AND 0.917 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 4911 ASSN STD SINGLE MATERIAL RESPONSE AND AMS 4928 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
MINIMUM TENSILE STRENGTH125000 POUNDS PER SQUARE INCH LBS
PERIPHERAL SHAPE STYLEROUND
MATERIALTITANIUM ALLOY UNS R56400 OVERALL
CENTER HOLE SHAPE STYLEROUND
HOLE DIAMETER0.563 INCHES MINIMUM AND 0.566 INCHES MAXIMUM IN
THICKNESS0.0295 INCHES MINIMUM AND 0.0345 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 03A158-18?
03A158-18 is a WASHER,FLAT.
What is the NSN for 03A158-18?
03A158-18 is cataloged in the U.S. Government catalog under NSN 5310-01-333-3795. 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.