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PartsTable / COMPONENT / 11A2287
11A2287 ✓ Verified by PartsTable
— · NUT WASHER
WHAT YOU NEED TO KNOW
Match nut grade to bolt grade for full strength Lock nuts prevent loosening under vibration
Don't mix grades — weakens the joint
PRODUCT OVERVIEW

The WASHER,FLAT is a the manufacturer industrial component. Key specifications include length: 1.750 INCHES MINIMUM AND 1.766 INCHES MAXIMUM IN, material: STEEL COMP 1010 OVERALL, thickness: 0.172 INCHES MINIMUM AND 0.203 INCHES MAXIMUM IN, hole_diameter: 0.328 INCHES MINIMUM AND 0.359 INCHES MAXIMUM IN, width_across_flats: 0.984 INCHES MINIMUM AND 1.016 INCHES MAXIMUM IN, peripheral_shape_style: RECTANGULAR. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-274-4541, 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
11A2287
NSN: 5310-00-274-4541
FSC: 5310
CAGE: 95201 — NAPCO INTERNATIONAL LLC DBA NAPCO INTERNATIONAL INC (USA)
SPECIFICATIONS
length1.750 INCHES MINIMUM AND 1.766 INCHES MAXIMUM IN
materialSTEEL COMP 1010 OVERALL
thickness0.172 INCHES MINIMUM AND 0.203 INCHES MAXIMUM IN
hole_diameter0.328 INCHES MINIMUM AND 0.359 INCHES MAXIMUM IN
width_across_flats0.984 INCHES MINIMUM AND 1.016 INCHES MAXIMUM IN
peripheral_shape_styleRECTANGULAR
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
material_document_and_classificationQQ-S-633-CANCELED FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5310-00-274-4541
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 11A2287 · 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
•
HOLE DIAMETER: 0.328 INCHES MINIMUM AND 0.359 INCHES MAXIMUM IN
•
CENTER HOLE SHAPE STYLE: ROUND
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
PERIPHERAL SHAPE STYLE: RECTANGULAR
•
THICKNESS: 0.172 INCHES MINIMUM AND 0.203 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-633-CANCELED FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
WIDTH ACROSS FLATS: 0.984 INCHES MINIMUM AND 1.016 INCHES MAXIMUM IN
•
MATERIAL: STEEL COMP 1010 OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
HOLE DIAMETER0.328 INCHES MINIMUM AND 0.359 INCHES MAXIMUM IN
CENTER HOLE SHAPE STYLEROUND
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
PERIPHERAL SHAPE STYLERECTANGULAR
THICKNESS0.172 INCHES MINIMUM AND 0.203 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-633-CANCELED FED SPEC SINGLE MATERIAL RESPONSE OVERALL
WIDTH ACROSS FLATS0.984 INCHES MINIMUM AND 1.016 INCHES MAXIMUM IN
MATERIALSTEEL COMP 1010 OVERALL
LENGTH1.750 INCHES MINIMUM AND 1.766 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 25
R4141FInterchangeable
interchangeable cross-reference
interchangeable
5940001139828Interchangeable
interchangeable cross-reference
interchangeable
AA5110-04Interchangeable
interchangeable cross-reference
interchangeable
H-B-531 TY1Interchangeable
interchangeable cross-reference
interchangeable
08755Interchangeable
interchangeable cross-reference
interchangeable
7171Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 11A2287?
11A2287 is a WASHER,FLAT.
What parts can replace 11A2287?
There are 25 known substitutes for 11A2287: R4141F, 5940001139828, AA5110-04 and 22 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 11A2287?
11A2287 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-274-4541. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026