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6566-40-631-3101 — NUT,PLAIN,ROUND

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

6566-40-631-3101: NUT,PLAIN,ROUND.

The NUT,PLAIN,ROUND is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY 7075 OVERALL, nut_style: ROUND, nut_diameter: 4.750 INCHES NOMINAL IN, thread_class: 3B, nut_thickness: 0.500 INCHES NOMINAL IN, thread_series: UNIFIED NATIONAL JOINT FINE (UNJF). This part is cataloged in the U.S.

Government catalog under NSN 5310-01-125-2009, 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
6566-40-631-3101
NSN: 5310-01-125-2009
FSC: 5310 — Nuts and Washers
CAGE: 78286 — SIKORSKY AIRCRAFT CORPORATION DBA SIKORSKY AIRCRAFT CORP (USA)
SPECIFICATIONS
materialALUMINUM ALLOY 7075 OVERALL
nut_styleROUND
nut_diameter4.750 INCHES NOMINAL IN
thread_class3B
nut_thickness0.500 INCHES NOMINAL IN
thread_seriesUNIFIED NATIONAL JOINT FINE (UNJF)
thread_directionRIGHT-HAND
drive_point_depth0.312 INCHES NOMINAL IN
drive_point_width0.312 INCHES NOMINAL IN
surface_treatmentANODIZE OVERALL
nominal_thread_size4.000 INCHES IN
drive_point_quantity4
NSN5310-01-125-2009
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 6566-40-631-3101 · 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-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
•
THREAD SERIES: UNIFIED NATIONAL JOINT FINE (UNJF)
•
HOLE CONFIGURATION STYLE: CONFIGURATION J
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-A-225/9 T651 FED SPEC SINGLE MATERIAL RESPONSE OR QQ-A-200/11 T6511 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
DRIVE POINT WIDTH: 0.312 INCHES NOMINAL IN
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 4.000 INCHES IN
•
NUT DIAMETER: 4.750 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD SERIESUNIFIED NATIONAL JOINT FINE (UNJF)
HOLE CONFIGURATION STYLECONFIGURATION J
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-A-225/9 T651 FED SPEC SINGLE MATERIAL RESPONSE OR QQ-A-200/11 T6511 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
DRIVE POINT WIDTH0.312 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE4.000 INCHES IN
NUT DIAMETER4.750 INCHES NOMINAL IN
DRIVE POINT DEPTH0.312 INCHES NOMINAL IN
NUT THICKNESS0.500 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: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 6566-40-631-3101?
6566-40-631-3101 is a NUT,PLAIN,ROUND.
What is the NSN for 6566-40-631-3101?
6566-40-631-3101 is cataloged in the U.S. Government catalog under NSN 5310-01-125-2009. This indicates validated use in U.S. government and defense supply chains.
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