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91090A103 — WASHER,FLAT

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

91090A103: WASHER,FLAT.

The WASHER,FLAT is a the manufacturer industrial component. Key specifications include thickness: 0.047 INCHES NOMINAL IN, hole_diameter: 0.203 INCHES NOMINAL IN, hardness_rating: 49.0 ROCKWELL B NOMINAL, overall_diameter: 0.500 INCHES NOMINAL IN, end_item_identification: 3835-01-511-7335, cross-sectional_shape_style: RECTANGULAR. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-533-5660, 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
91090A103
NSN: 5310-01-533-5660
FSC: 5310 — Nuts and Washers
CAGE: 39428 — MCMASTER-CARR SUPPLY CO (USA)
SPECIFICATIONS
materialSTEEL COMP 1006 OR STEEL COMP 1008 OR STEEL COMP 1009 OR STEEL COMP 1010 OR STEEL COMP 1011 OR STEEL COMP 1012 OR STEEL COMP 1013 OR STEEL COMP 1015 OVERALL
thickness0.047 INCHES NOMINAL IN
hole_diameter0.203 INCHES NOMINAL IN
hardness_rating49.0 ROCKWELL B NOMINAL
overall_diameter0.500 INCHES NOMINAL IN
end_item_identification3835-01-511-7335
cross-sectional_shape_styleRECTANGULAR
part_name_assigned_by_controlling_agencyWASHER FLAT
NSN5310-01-533-5660
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 91090A103 · 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: 0.500 INCHES NOMINAL IN
•
HARDNESS RATING: 49.0 ROCKWELL B NOMINAL
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
MATERIAL: STEEL COMP 1006 OR STEEL COMP 1008 OR STEEL COMP 1009 OR STEEL COMP 1010 OR STEEL COMP 1011 OR STEEL COMP 1012 OR STEEL COMP 1013 OR STEEL COMP 1015 OVERALL
•
HOLE DIAMETER: 0.203 INCHES NOMINAL IN
•
THICKNESS: 0.047 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
OVERALL DIAMETER0.500 INCHES NOMINAL IN
HARDNESS RATING49.0 ROCKWELL B NOMINAL
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
PART NAME ASSIGNED BY CONTROLLING AGENCYWASHER FLAT
END ITEM IDENTIFICATION3835-01-511-7335
MATERIALSTEEL COMP 1006 OR STEEL COMP 1008 OR STEEL COMP 1009 OR STEEL COMP 1010 OR STEEL COMP 1011 OR STEEL COMP 1012 OR STEEL COMP 1013 OR STEEL COMP 1015 OVERALL
HOLE DIAMETER0.203 INCHES NOMINAL IN
THICKNESS0.047 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 1
HW20068Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 91090A103?
91090A103 is a WASHER,FLAT.
What parts can replace 91090A103?
There is 1 known substitute for 91090A103: HW20068. Substitute compatibility should be verified for your specific system.
What is the NSN for 91090A103?
91090A103 is cataloged in the U.S. Government catalog under NSN 5310-01-533-5660. 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.