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8668790 — NUT,PLAIN,SLOTTED,HEXAGON

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

8668790: NUT,PLAIN,SLOTTED,HEXAGON.

The NUT,PLAIN,SLOTTED,HEXAGON is a the manufacturer industrial component. Key specifications include nut_style: SLOTTED, HEXAGONSLOTTED, HEXAGON, nut_height: 0.301 INCHES MINIMUM AND 0.301 INCHES MINIMUM AND 0.323 INCHES MAXIMUM0.323 INCHES MAXIMUM IN, thread_class: 2B2B, thread_series: UNFUNF, special_features: MUST WITHSTAND MIN PROOF LOAD OF 40000 PSIMUST WITHSTAND MIN PROOF LOAD OF 40000 PSI, thread_direction: RIGHT-HANDRIGHT-HAND. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-138-5507, 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
8668790
NSN: 5310-01-138-5507
FSC: 5310 — Nuts and Washers
CAGE: 19207 — U S ARMY TANK AUTOMOTIVE COMMAND AMSTA-IM-MM (USA)
SPECIFICATIONS
nut_styleSLOTTED, HEXAGONSLOTTED, HEXAGON
nut_height0.301 INCHES MINIMUM AND 0.301 INCHES MINIMUM AND 0.323 INCHES MAXIMUM0.323 INCHES MAXIMUM IN
thread_class2B2B
thread_seriesUNFUNF
special_featuresMUST WITHSTAND MIN PROOF LOAD OF 40000 PSIMUST WITHSTAND MIN PROOF LOAD OF 40000 PSI
thread_directionRIGHT-HANDRIGHT-HAND
surface_treatmentCADMIUM AND CADMIUM AND CHROMATE OVERALLCHROMATE OVERALL
width_across_flats0.736 INCHES MINIMUM AND 0.736 INCHES MINIMUM AND 0.750 INCHES MAXIMUM0.750 INCHES MAXIMUM IN
nominal_thread_size0.500 INCHES0.500 INCHES IN
bearing_surface_typeFLATFLAT
counterbore_diameter0.625 INCHES NOMINAL FIRST END0.625 INCHES NOMINAL FIRST END IN
nut_counterbore_depth0.011 INCHES MINIMUM AND 0.011 INCHES MINIMUM AND 0.021 INCHES MAXIMUM FIRST END0.021 INCHES MAXIMUM FIRST END IN
NSN5310-01-138-5507
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 8668790 · 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
•
WIDTH ACROSS FLATS: 0.736 INCHES MINIMUM AND 0.736 INCHES MINIMUM AND 0.750 INCHES MAXIMUM0.750 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TYPE 2,CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALLQQ-P-416,TYPE 2,CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
THREAD SERIES: UNFUNF
•
NUT COUNTERBORE DEPTH: 0.011 INCHES MINIMUM AND 0.011 INCHES MINIMUM AND 0.021 INCHES MAXIMUM FIRST END0.021 INCHES MAXIMUM FIRST END IN
•
THREAD DIRECTION: RIGHT-HANDRIGHT-HAND
•
NOMINAL THREAD SIZE: 0.500 INCHES0.500 INCHES IN
•
COUNTERBORE DIAMETER: 0.625 INCHES NOMINAL FIRST END0.625 INCHES NOMINAL FIRST END IN
•
NUT HEIGHT: 0.301 INCHES MINIMUM AND 0.301 INCHES MINIMUM AND 0.323 INCHES MAXIMUM0.323 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.736 INCHES MINIMUM AND 0.736 INCHES MINIMUM AND 0.750 INCHES MAXIMUM0.750 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TYPE 2,CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALLQQ-P-416,TYPE 2,CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD SERIESUNFUNF
NUT COUNTERBORE DEPTH0.011 INCHES MINIMUM AND 0.011 INCHES MINIMUM AND 0.021 INCHES MAXIMUM FIRST END0.021 INCHES MAXIMUM FIRST END IN
THREAD DIRECTIONRIGHT-HANDRIGHT-HAND
NOMINAL THREAD SIZE0.500 INCHES0.500 INCHES IN
COUNTERBORE DIAMETER0.625 INCHES NOMINAL FIRST END0.625 INCHES NOMINAL FIRST END IN
NUT HEIGHT0.301 INCHES MINIMUM AND 0.301 INCHES MINIMUM AND 0.323 INCHES MAXIMUM0.323 INCHES MAXIMUM IN
SPECIAL FEATURESMUST WITHSTAND MIN PROOF LOAD OF 40000 PSIMUST WITHSTAND MIN PROOF LOAD OF 40000 PSI
SURFACE TREATMENTCADMIUM AND CADMIUM AND CHROMATE OVERALLCHROMATE 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 8668790?
8668790 is a NUT,PLAIN,SLOTTED,HEXAGON.
What is the NSN for 8668790?
8668790 is cataloged in the U.S. Government catalog under NSN 5310-01-138-5507. 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.