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74A551866-2001 — WASHER,CONCAVE

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

74A551866-2001: WASHER,CONCAVE.

The WASHER,CONCAVE is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY 6061 OVERALL, hole_diameter: 2.115 INCHES MINIMUM AND 2.135 INCHES MAXIMUM IN, outside_diameter: 2.600 INCHES MINIMUM AND 2.660 INCHES MAXIMUM IN, style_designator: CONCAVE, material_thickness: 0.115 INCHES MINIMUM AND 0.135 INCHES MAXIMUM IN, specification/standard_data: 76301-74A551866-2001 PROFESSIONAL/INDUSTRIAL ASSOCIATION SPECIFICATION. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-321-4332, 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
74A551866-2001
NSN: 5310-01-321-4332
FSC: 5310 — Nuts and Washers
CAGE: 76301 — THE BOEING COMPANY DIV DEFENSE (USA)
SPECIFICATIONS
materialALUMINUM ALLOY 6061 OVERALL
hole_diameter2.115 INCHES MINIMUM AND 2.135 INCHES MAXIMUM IN
outside_diameter2.600 INCHES MINIMUM AND 2.660 INCHES MAXIMUM IN
style_designatorCONCAVE
material_thickness0.115 INCHES MINIMUM AND 0.135 INCHES MAXIMUM IN
specification/standard_data76301-74A551866-2001 PROFESSIONAL/INDUSTRIAL ASSOCIATION SPECIFICATION
material_document_and_classificationQQ-A-250/11 T6 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5310-01-321-4332
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 74A551866-2001 · 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
•
STYLE DESIGNATOR: CONCAVE
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-A-250/11 T6 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 2.600 INCHES MINIMUM AND 2.660 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.115 INCHES MINIMUM AND 0.135 INCHES MAXIMUM IN
•
SPECIFICATION/STANDARD DATA: 76301-74A551866-2001 PROFESSIONAL/INDUSTRIAL ASSOCIATION SPECIFICATION
•
MATERIAL: ALUMINUM ALLOY 6061 OVERALL
•
HOLE DIAMETER: 2.115 INCHES MINIMUM AND 2.135 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
STYLE DESIGNATORCONCAVE
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-A-250/11 T6 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER2.600 INCHES MINIMUM AND 2.660 INCHES MAXIMUM IN
MATERIAL THICKNESS0.115 INCHES MINIMUM AND 0.135 INCHES MAXIMUM IN
SPECIFICATION/STANDARD DATA76301-74A551866-2001 PROFESSIONAL/INDUSTRIAL ASSOCIATION SPECIFICATION
MATERIALALUMINUM ALLOY 6061 OVERALL
HOLE DIAMETER2.115 INCHES MINIMUM AND 2.135 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 74A551866-2001?
74A551866-2001 is a WASHER,CONCAVE.
What is the NSN for 74A551866-2001?
74A551866-2001 is cataloged in the U.S. Government catalog under NSN 5310-01-321-4332. 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.
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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.