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6766408 — NUT,PLAIN,ROUND

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

6766408: NUT,PLAIN,ROUND.

The NUT,PLAIN,ROUND is a the manufacturer industrial component. Key specifications include material: STEEL COMP 8640 OVERALL, nut_style: ROUND, nut_diameter: 2.870 INCHES MINIMUM AND 2.890 INCHES MAXIMUM IN, thread_class: 3B, nut_thickness: 1.490 INCHES MINIMUM AND 1.510 INCHES MAXIMUM IN, thread_series: UN. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-208-2806, 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
6766408
NSN: 5310-00-208-2806
FSC: 5310 — Nuts and Washers
CAGE: 24617 — GENERAL MOTORS CORP (USA)
SPECIFICATIONS
materialSTEEL COMP 8640 OVERALL
nut_styleROUND
nut_diameter2.870 INCHES MINIMUM AND 2.890 INCHES MAXIMUM IN
thread_class3B
nut_thickness1.490 INCHES MINIMUM AND 1.510 INCHES MAXIMUM IN
thread_seriesUN
hardness_rating26.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM
thread_directionRIGHT-HAND
countersink_angle89.0 DEGREES MINIMUM AND 91.0 DEGREES MAXIMUM NUT
drive_point_depth0.437 INCHES NOMINAL IN
drive_point_width0.310 INCHES MINIMUM AND 0.330 INCHES MAXIMUM IN
small_end_diameter2.490 INCHES MINIMUM AND 2.510 INCHES MAXIMUM IN
NSN5310-00-208-2806
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 6766408 · 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
•
THREAD SERIES: UN
•
HARDNESS RATING: 26.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM
•
MATERIAL DOCUMENT AND CLASSIFICATION: SAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
DRIVE POINT WIDTH: 0.310 INCHES MINIMUM AND 0.330 INCHES MAXIMUM IN
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 1.750 INCHES IN
•
NUT DIAMETER: 2.870 INCHES MINIMUM AND 2.890 INCHES MAXIMUM IN
•
DRIVE POINT DEPTH: 0.437 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
THREAD SERIESUN
HARDNESS RATING26.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM
MATERIAL DOCUMENT AND CLASSIFICATIONSAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL
DRIVE POINT WIDTH0.310 INCHES MINIMUM AND 0.330 INCHES MAXIMUM IN
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE1.750 INCHES IN
NUT DIAMETER2.870 INCHES MINIMUM AND 2.890 INCHES MAXIMUM IN
DRIVE POINT DEPTH0.437 INCHES NOMINAL IN
UNDERCUT THICKNESS1.240 INCHES MINIMUM AND 1.260 INCHES MAXIMUM IN
NUT THICKNESS1.490 INCHES MINIMUM AND 1.510 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 1
5310002082806Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 6766408?
6766408 is a NUT,PLAIN,ROUND.
What parts can replace 6766408?
There is 1 known substitute for 6766408: 5310002082806. Substitute compatibility should be verified for your specific system.
What is the NSN for 6766408?
6766408 is cataloged in the U.S. Government catalog under NSN 5310-00-208-2806. 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.