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3C3578 ITEM 2 — NUT,PLAIN,ROUND

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

3C3578 ITEM 2: NUT,PLAIN,ROUND.

The NUT,PLAIN,ROUND is a the manufacturer industrial component. Key specifications include material: STEEL COMP 4130 OR STEEL COMP 4135 OR STEEL COMP 4137 OR STEEL COMP 4140 OR STEEL COMP 4142 OVERALL, nut_style: ROUND, nut_diameter: 9.300 INCHES NOMINAL IN, thread_class: 2B, nut_thickness: 0.500 INCHES NOMINAL IN, thread_series: UN. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-272-4822, 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
3C3578 ITEM 2
NSN: 5310-01-272-4822
FSC: 5310 — Nuts and Washers
CAGE: 07482 — GENERAL ELECTRIC COMPANY (USA)
SPECIFICATIONS
materialSTEEL COMP 4130 OR STEEL COMP 4135 OR STEEL COMP 4137 OR STEEL COMP 4140 OR STEEL COMP 4142 OVERALL
nut_styleROUND
nut_diameter9.300 INCHES NOMINAL IN
thread_class2B
nut_thickness0.500 INCHES NOMINAL IN
thread_seriesUN
hardness_rating34.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM
special_featuresLINE SCRIBED ONE SIDE,45.0 DEG BTWN HOLES,STAMPED: TOP VERT CL
thread_directionRIGHT-HAND
surface_treatmentOXIDE FILM OVERALL
nominal_thread_size2.250 INCHES IN
drive_point_diameter0.562 INCHES NOMINAL IN
NSN5310-01-272-4822
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 3C3578 ITEM 2 · 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-STD-808,FINISH D210 MIL STD SINGLE TREATMENT RESPONSE OVERALL
•
THREAD SERIES: UN
•
HARDNESS RATING: 34.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 2.250 INCHES IN
•
NUT DIAMETER: 9.300 INCHES NOMINAL IN
•
NUT THICKNESS: 0.500 INCHES NOMINAL IN
•
DRIVE POINT DIAMETER: 0.562 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-STD-808,FINISH D210 MIL STD SINGLE TREATMENT RESPONSE OVERALL
THREAD SERIESUN
HARDNESS RATING34.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE2.250 INCHES IN
NUT DIAMETER9.300 INCHES NOMINAL IN
NUT THICKNESS0.500 INCHES NOMINAL IN
DRIVE POINT DIAMETER0.562 INCHES NOMINAL IN
SPECIAL FEATURESLINE SCRIBED ONE SIDE,45.0 DEG BTWN HOLES,STAMPED: TOP VERT CL
SURFACE TREATMENTOXIDE FILM 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 1
3C3578P02Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 3C3578 ITEM 2?
3C3578 ITEM 2 is a NUT,PLAIN,ROUND.
What parts can replace 3C3578 ITEM 2?
There is 1 known substitute for 3C3578 ITEM 2: 3C3578P02. Substitute compatibility should be verified for your specific system.
What is the NSN for 3C3578 ITEM 2?
3C3578 ITEM 2 is cataloged in the U.S. Government catalog under NSN 5310-01-272-4822. 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.