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42801A — WASHER,SHOULDERED AND RECESSED

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

42801A: WASHER,SHOULDERED AND RECESSED.

The WASHER,SHOULDERED AND RECESSED is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY 2024 OVERALL, recess_depth: 0.443 INCHES MINIMUM AND 0.453 INCHES MAXIMUM IN, hole_diameter: 0.665 INCHES MINIMUM AND 0.668 INCHES MAXIMUM IN, recess_diameter: 0.825 INCHES MINIMUM AND 0.833 INCHES MAXIMUM IN, shoulder_height: 0.060 INCHES MINIMUM AND 0.064 INCHES MAXIMUM IN, outside_diameter: 0.990 INCHES MINIMUM AND 0.991 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-055-2028, 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
42801A
NSN: 5310-01-055-2028
FSC: 5310 — Nuts and Washers
CAGE: 73760 — ITT AEROSPACE CONTROLS LLC DBA ITT AEROSPACE CONTROLS UNIT S (USA)
SPECIFICATIONS
materialALUMINUM ALLOY 2024 OVERALL
recess_depth0.443 INCHES MINIMUM AND 0.453 INCHES MAXIMUM IN
hole_diameter0.665 INCHES MINIMUM AND 0.668 INCHES MAXIMUM IN
recess_diameter0.825 INCHES MINIMUM AND 0.833 INCHES MAXIMUM IN
shoulder_height0.060 INCHES MINIMUM AND 0.064 INCHES MAXIMUM IN
outside_diameter0.990 INCHES MINIMUM AND 0.991 INCHES MAXIMUM IN
style_designatorSHOULDERED AND RECESSED
shoulder_diameter0.964 INCHES MINIMUM AND 0.966 INCHES MAXIMUM IN
surface_treatmentANODIZE OVERALL
material_thickness0.449 INCHES MINIMUM AND 0.459 INCHES MAXIMUM IN
material_document_and_classificationQQ-A-200/3 FED SPEC 1ST MATERIAL RESPONSE AND QQ-A-225/6,T351 FED SPEC 2ND MATERIAL RESPONSE OVERALL
surface_treatment_document_and_classificationMIL-A-8625,TY 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN5310-01-055-2028
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 42801A · 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: MIL-A-8625,TY 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
•
SHOULDER HEIGHT: 0.060 INCHES MINIMUM AND 0.064 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: SHOULDERED AND RECESSED
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-A-200/3 FED SPEC 1ST MATERIAL RESPONSE AND QQ-A-225/6,T351 FED SPEC 2ND MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 0.990 INCHES MINIMUM AND 0.991 INCHES MAXIMUM IN
•
RECESS DEPTH: 0.443 INCHES MINIMUM AND 0.453 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.449 INCHES MINIMUM AND 0.459 INCHES MAXIMUM IN
•
SHOULDER DIAMETER: 0.964 INCHES MINIMUM AND 0.966 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-A-8625,TY 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
SHOULDER HEIGHT0.060 INCHES MINIMUM AND 0.064 INCHES MAXIMUM IN
STYLE DESIGNATORSHOULDERED AND RECESSED
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-A-200/3 FED SPEC 1ST MATERIAL RESPONSE AND QQ-A-225/6,T351 FED SPEC 2ND MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER0.990 INCHES MINIMUM AND 0.991 INCHES MAXIMUM IN
RECESS DEPTH0.443 INCHES MINIMUM AND 0.453 INCHES MAXIMUM IN
MATERIAL THICKNESS0.449 INCHES MINIMUM AND 0.459 INCHES MAXIMUM IN
SHOULDER DIAMETER0.964 INCHES MINIMUM AND 0.966 INCHES MAXIMUM IN
RECESS DIAMETER0.825 INCHES MINIMUM AND 0.833 INCHES MAXIMUM IN
SURFACE TREATMENTANODIZE OVERALL
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: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 42801A?
42801A is a WASHER,SHOULDERED AND RECESSED.
What is the NSN for 42801A?
42801A is cataloged in the U.S. Government catalog under NSN 5310-01-055-2028. 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.