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6566-20-340-2107 — NUT,PLAIN,HEXAGON

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

6566-20-340-2107: NUT,PLAIN,HEXAGON.

The NUT,PLAIN,HEXAGON is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY 7075 OVERALL, nut_style: HEXAGONHEXAGON, nut_height: 0.470 INCHES NOMINAL0.470 INCHES NOMINAL IN, thread_class: 3B3B, thread_series: UNIFIED NATIONAL JOINT FINE (UNJF)UNIFIED NATIONAL JOINT FINE (UNJF), thread_direction: RIGHT-HANDRIGHT-HAND. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-135-1176, 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
6566-20-340-2107
NSN: 5310-01-135-1176
FSC: 5310 — Nuts and Washers
CAGE: 78286 — SIKORSKY AIRCRAFT CORPORATION DBA SIKORSKY AIRCRAFT CORP (USA)
SPECIFICATIONS
materialALUMINUM ALLOY 7075 OVERALL
nut_styleHEXAGONHEXAGON
nut_height0.470 INCHES NOMINAL0.470 INCHES NOMINAL IN
thread_class3B3B
thread_seriesUNIFIED NATIONAL JOINT FINE (UNJF)UNIFIED NATIONAL JOINT FINE (UNJF)
thread_directionRIGHT-HANDRIGHT-HAND
surface_treatmentANODIZE OVERALLANODIZE OVERALL
width_across_flats1.109 INCHES MINIMUM AND 1.109 INCHES MINIMUM AND 1.127 INCHES MAXIMUM1.127 INCHES MAXIMUM IN
nominal_thread_size0.750 INCHES0.750 INCHES IN
bearing_surface_typeFLATFLAT
thread_quantity_per_inch1616
material_document_and_classificationSS8043 FSCM 78286 MFR REF SINGLE MATERIAL RESPONSE OVERALLSS8043 FSCM 78286 MFR REF SINGLE MATERIAL RESPONSE OVERALL
NSN5310-01-135-1176
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 6566-20-340-2107 · 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: 1.109 INCHES MINIMUM AND 1.109 INCHES MINIMUM AND 1.127 INCHES MAXIMUM1.127 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-A-8625,TYPE 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALLMIL-A-8625,TYPE 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
•
THREAD SERIES: UNIFIED NATIONAL JOINT FINE (UNJF)UNIFIED NATIONAL JOINT FINE (UNJF)
•
MATERIAL DOCUMENT AND CLASSIFICATION: SS8043 FSCM 78286 MFR REF SINGLE MATERIAL RESPONSE OVERALLSS8043 FSCM 78286 MFR REF SINGLE MATERIAL RESPONSE OVERALL
•
THREAD DIRECTION: RIGHT-HANDRIGHT-HAND
•
NOMINAL THREAD SIZE: 0.750 INCHES0.750 INCHES IN
•
NUT HEIGHT: 0.470 INCHES NOMINAL0.470 INCHES NOMINAL IN
•
SURFACE TREATMENT: ANODIZE OVERALLANODIZE OVERALL
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS1.109 INCHES MINIMUM AND 1.109 INCHES MINIMUM AND 1.127 INCHES MAXIMUM1.127 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-A-8625,TYPE 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALLMIL-A-8625,TYPE 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD SERIESUNIFIED NATIONAL JOINT FINE (UNJF)UNIFIED NATIONAL JOINT FINE (UNJF)
MATERIAL DOCUMENT AND CLASSIFICATIONSS8043 FSCM 78286 MFR REF SINGLE MATERIAL RESPONSE OVERALLSS8043 FSCM 78286 MFR REF SINGLE MATERIAL RESPONSE OVERALL
THREAD DIRECTIONRIGHT-HANDRIGHT-HAND
NOMINAL THREAD SIZE0.750 INCHES0.750 INCHES IN
NUT HEIGHT0.470 INCHES NOMINAL0.470 INCHES NOMINAL IN
SURFACE TREATMENTANODIZE OVERALLANODIZE OVERALL
NUT STYLEHEXAGONHEXAGON
THREAD CLASS3B3B
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 6566-20-340-2107?
6566-20-340-2107 is a NUT,PLAIN,HEXAGON.
What is the NSN for 6566-20-340-2107?
6566-20-340-2107 is cataloged in the U.S. Government catalog under NSN 5310-01-135-1176. 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.