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6778078 — NUT,PLAIN,ROUND

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

6778078: NUT,PLAIN,ROUND.

The NUT,PLAIN,ROUND is a the manufacturer industrial component. Key specifications include material: STEEL COMP 1141 OVERALL, nut_style: ROUND, nut_diameter: 2.400 INCHES NOMINAL IN, thread_class: 3B, nut_thickness: 0.530 INCHES NOMINAL IN, thread_series: UNF. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-059-5798, 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
6778078
NSN: 5310-00-059-5798
FSC: 5310 — Nuts and Washers
CAGE: 6H244 — THE W.W. WILLIAMS COMPANY, LLC (USA)
SPECIFICATIONS
materialSTEEL COMP 1141 OVERALL
nut_styleROUND
nut_diameter2.400 INCHES NOMINAL IN
thread_class3B
nut_thickness0.530 INCHES NOMINAL IN
thread_seriesUNF
thread_directionRIGHT-HAND
drive_point_depth0.156 INCHES NOMINAL IN
drive_point_width0.375 INCHES NOMINAL IN
surface_treatmentPHOSPHATE MANGANESE OVERALL
small_end_diameter1.380 INCHES NOMINAL IN
undercut_thickness0.170 INCHES NOMINAL IN
NSN5310-00-059-5798
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 6778078 · 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-P-16232,TY M,CL 1 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
•
THREAD SERIES: UNF
•
MATERIAL DOCUMENT AND CLASSIFICATION: 66 FED STD SINGLE MATERIAL RESPONSE OVERALL
•
DRIVE POINT WIDTH: 0.375 INCHES NOMINAL IN
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 1.250 INCHES IN
•
NUT DIAMETER: 2.400 INCHES NOMINAL IN
•
DRIVE POINT DEPTH: 0.156 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-P-16232,TY M,CL 1 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD SERIESUNF
MATERIAL DOCUMENT AND CLASSIFICATION66 FED STD SINGLE MATERIAL RESPONSE OVERALL
DRIVE POINT WIDTH0.375 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE1.250 INCHES IN
NUT DIAMETER2.400 INCHES NOMINAL IN
DRIVE POINT DEPTH0.156 INCHES NOMINAL IN
UNDERCUT THICKNESS0.170 INCHES NOMINAL IN
NUT THICKNESS0.530 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 1
SRS6778078Same 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 6778078?
6778078 is a NUT,PLAIN,ROUND.
What parts can replace 6778078?
There is 1 known substitute for 6778078: SRS6778078. Substitute compatibility should be verified for your specific system.
What is the NSN for 6778078?
6778078 is cataloged in the U.S. Government catalog under NSN 5310-00-059-5798. 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.