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2878303 — NUT,PLAIN,KNURLED

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

2878303: NUT,PLAIN,KNURLED.

The NUT,PLAIN,KNURLED is a the manufacturer industrial component. Key specifications include material: STEEL COMP 1020 OVERALL, nut_style: KNURLED, nut_diameter: 3.375 INCHES NOMINAL IN, thread_class: 2B, nut_thickness: 1.250 INCHES NOMINAL IN, thread_series: UN. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-058-1949, 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
2878303
NSN: 5310-01-058-1949
FSC: 5310 — Nuts and Washers
CAGE: 10001 — NAVAIR AND NAVSEA MANAGED ORIGINAL DESIGN ACTIVITY DWG NOT MATERIAL/PARTS SUPPLIER (USA)
SPECIFICATIONS
materialSTEEL COMP 1020 OVERALL
nut_styleKNURLED
nut_diameter3.375 INCHES NOMINAL IN
thread_class2B
nut_thickness1.250 INCHES NOMINAL IN
thread_seriesUN
thread_directionRIGHT-HAND
surface_treatmentZINC OVERALL
nominal_thread_size2.500 INCHES IN
counterbore_diameter2.500 INCHES NOMINAL OVERALL IN
drilled_hole_diameter0.250 INCHES NOMINAL IN
nut_counterbore_depth0.188 INCHES NOMINAL OVERALL IN
NSN5310-01-058-1949
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 2878303 · 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: QQ-Z-325,TYPE 2,CLASS 1 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
THREAD SERIES: UN
•
HOLE CONFIGURATION STYLE: CONFIGURATION F
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASTM A-108 FED STD SINGLE MATERIAL RESPONSE OVERALL
•
NUT COUNTERBORE DEPTH: 0.188 INCHES NOMINAL OVERALL IN
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 2.500 INCHES IN
•
NUT DIAMETER: 3.375 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-Z-325,TYPE 2,CLASS 1 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD SERIESUN
HOLE CONFIGURATION STYLECONFIGURATION F
MATERIAL DOCUMENT AND CLASSIFICATIONASTM A-108 FED STD SINGLE MATERIAL RESPONSE OVERALL
NUT COUNTERBORE DEPTH0.188 INCHES NOMINAL OVERALL IN
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE2.500 INCHES IN
NUT DIAMETER3.375 INCHES NOMINAL IN
COUNTERBORE DIAMETER2.500 INCHES NOMINAL OVERALL IN
NUT THICKNESS1.250 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

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 2878303?
2878303 is a NUT,PLAIN,KNURLED.
What is the NSN for 2878303?
2878303 is cataloged in the U.S. Government catalog under NSN 5310-01-058-1949. 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.