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C20784 — NUT ASSEMBLY,RETAINER RING

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

C20784: NUT ASSEMBLY,RETAINER RING.

The NUT ASSEMBLY,RETAINER RING is a the manufacturer industrial component. Key specifications include material: STEEL COMP 630, grip_height: 0.210 INCHES NOMINAL IN, overall_height: 0.360 INCHES MINIMUM AND 0.378 INCHES MAXIMUM IN, overall_length: 0.485 INCHES NOMINAL IN, shoulder_width: 0.485 INCHES MAXIMUM IN, surface_treatment: PASSIVATE. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-680-7929, 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
C20784
NSN: 5310-01-680-7929
NIINs: 016807929, 016807985, 016808017, 016814987
FSC: 5310 — Nuts and Washers
CAGE: 81755 — LOCKHEED MARTIN CORPORATION DIV LOCKHEED MARTIN AERONAUTICS COMPANY (USA)
SPECIFICATIONS
materialSTEEL COMP 630
grip_height0.210 INCHES NOMINAL IN
overall_height0.360 INCHES MINIMUM AND 0.378 INCHES MAXIMUM IN
overall_length0.485 INCHES NOMINAL IN
shoulder_width0.485 INCHES MAXIMUM IN
surface_treatmentPASSIVATE
mounting_hole_diameter0.261 INCHES MINIMUM AND 0.266 INCHES MAXIMUM IN
end_item_identificationF16 AIRCRAFT
material_document_and_classification17-4PH SST PER AMS643,COND H1025 ASSN STD SINGLE MATERIAL RESPONSE
part_name_assigned_by_controlling_agencyRETAINER,NUT,COLD-WORKED,RIVETLESS
surface_treatment_document_and_classificationSAE-AMS-QQ-P-35 NATIONAL STD/SPEC SINGLE TREATMENT RESPONSE OR ASTM A967 OR AMS2700 ASSN STD SINGLE TREATMENT RESPONSE
NSN5310-01-680-7929
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: C20784 · 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
•
SHOULDER WIDTH: 0.485 INCHES MAXIMUM IN
•
MATERIAL: STEEL CORROSION RESISTING OVERALL
TECHNICAL CHARACTERISTICS
SHOULDER WIDTH0.485 INCHES MAXIMUM IN
PART NAME ASSIGNED BY CONTROLLING AGENCYRETAINER,NUT,COLD WORKED,RIVETLESS
END ITEM IDENTIFICATIONF16
MATERIALSTEEL CORROSION RESISTING OVERALL
SUBSTITUTES & CROSS-REFERENCES 1
FTSRC-483-A-1-ASame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 C20784?
C20784 is a NUT ASSEMBLY,RETAINER RING.
What parts can replace C20784?
There is 1 known substitute for C20784: FTSRC-483-A-1-A. Substitute compatibility should be verified for your specific system.
What is the NSN for C20784?
C20784 is cataloged in the U.S. Government catalog under NSN 5310-01-680-7929. 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.