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91434A155 — WASHER,FLAT

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

91434A155: WASHER,FLAT.

The WASHER,FLAT is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, thickness: 0.05 INCHES MINIMUM AND 0.08 INCHES MAXIMUM IN, hole_diameter: 0.40625 INCHES NOMINAL IN, overall_diameter: 0.8125 INCHES NOMINAL IN, special_features: BLACK-LUSTER FINISH PROVIDES SUPERIOR CORROSION RESISTANCE AND 500 HOURS OF SALT SPRAY RESISTANCE IAW ASTM B117, surface_treatment: ENAMEL SEMIGLOSS OVERALL. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-615-0643, 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
91434A155
NSN: 5310-01-615-0643
FSC: 5310 — Nuts and Washers
CAGE: 39428 — MCMASTER-CARR SUPPLY CO (USA)
SPECIFICATIONS
materialSTEEL OVERALL
thickness0.05 INCHES MINIMUM AND 0.08 INCHES MAXIMUM IN
hole_diameter0.40625 INCHES NOMINAL IN
overall_diameter0.8125 INCHES NOMINAL IN
special_featuresBLACK-LUSTER FINISH PROVIDES SUPERIOR CORROSION RESISTANCE AND 500 HOURS OF SALT SPRAY RESISTANCE IAW ASTM B117
surface_treatmentENAMEL SEMIGLOSS OVERALL
peripheral_shape_styleROUND
center_hole_shape_styleROUND
end_item_identification7010-01-610-3557
cross-sectional_shape_styleRECTANGULAR
material_document_and_classificationASME B18.22.1 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
part_name_assigned_by_controlling_agencyBLACK-LUSTER-COATED STEEL SAE STANDARD WASHER
NSN5310-01-615-0643
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 91434A155 · 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 TREATMENT DOCUMENT AND CLASSIFICATION: BLACK LUSTER COATED MFR REF SINGLE TREATMENT RESPONSE OVERALL
•
OVERALL DIAMETER: 0.8125 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASME B18.22.1 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
COLOR: BLACK OVERALL
•
SURFACE TREATMENT: ENAMEL SEMIGLOSS OVERALL
•
PERIPHERAL SHAPE STYLE: ROUND
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONBLACK LUSTER COATED MFR REF SINGLE TREATMENT RESPONSE OVERALL
OVERALL DIAMETER0.8125 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONASME B18.22.1 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
COLORBLACK OVERALL
SPECIAL FEATURESBLACK-LUSTER FINISH PROVIDES SUPERIOR CORROSION RESISTANCE AND 500 HOURS OF SALT SPRAY RESISTANCE IAW ASTM B117
SURFACE TREATMENTENAMEL SEMIGLOSS OVERALL
PERIPHERAL SHAPE STYLEROUND
PART NAME ASSIGNED BY CONTROLLING AGENCYBLACK-LUSTER-COATED STEEL SAE STANDARD WASHER
END ITEM IDENTIFICATION7010-01-610-3557
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: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 91434A155?
91434A155 is a WASHER,FLAT.
What is the NSN for 91434A155?
91434A155 is cataloged in the U.S. Government catalog under NSN 5310-01-615-0643. 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.