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C20814-4-3 — NUT,SELF-LOCKING,PLATE

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

C20814-4-3: NUT,SELF-LOCKING,PLATE.

The NUT,SELF-LOCKING,PLATE is a the manufacturer industrial component. Key specifications include material: NICKEL ALLOY 718 NUT, nut_style: PLATE (FLOATING), nut_height: 0.562 INCHES MINIMUM AND 0.582 INCHES MAXIMUM IN, nut_length: 1.235 INCHES MINIMUM AND 1.255 INCHES MAXIMUM IN, plate_width: 0.797 INCHES MINIMUM AND 0.817 INCHES MAXIMUM IN, thread_class: 3B. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-485-6740, 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
C20814-4-3
NSN: 5310-01-485-6740
FSC: 5310 — Nuts and Washers
CAGE: 81755 — LOCKHEED MARTIN CORPORATION DIV LOCKHEED MARTIN AERONAUTICS COMPANY (USA)
SPECIFICATIONS
materialNICKEL ALLOY 718 NUT
nut_stylePLATE (FLOATING)
nut_height0.562 INCHES MINIMUM AND 0.582 INCHES MAXIMUM IN
nut_length1.235 INCHES MINIMUM AND 1.255 INCHES MAXIMUM IN
plate_width0.797 INCHES MINIMUM AND 0.817 INCHES MAXIMUM IN
thread_class3B
thread_seriesUNIFIED NATIONAL JOINT FINE (UNJF)
locking_featurePREVAILING TORQUE ALL METAL DESIGN
plate_thickness0.050 INCHES MINIMUM AND 0.070 INCHES MAXIMUM IN
special_featuresNUT, PLATE-CAP HEIGHT .825 + OR -.010, CAP O.D. .550 + OR - .010, BASE PLATE TOP LT CORNER TO RT SIDE LOWER CORNER 1.05 + OR - .010
thread_directionRIGHT-HAND
surface_treatmentPASSIVATE NUT
NSN5310-01-485-6740
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: C20814-4-3 · 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
•
PLATE THICKNESS: 0.050 INCHES MINIMUM AND 0.070 INCHES MAXIMUM IN
•
NUT LENGTH: 1.235 INCHES MINIMUM AND 1.255 INCHES MAXIMUM IN
•
THREAD SERIES: UNIFIED NATIONAL JOINT FINE (UNJF)
•
PLATE WIDTH: 0.797 INCHES MINIMUM AND 0.817 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS-5525 ASSN STD 1ST MATERIAL RESPONSE OR AMS-5726 ASSN STD 2ND MATERIAL RESPONSE OR AMS-5731 ASSN STD 3RD MATERIAL RESPONSE OR AMS-5732 ASSN STD 4TH MATERIAL RESPONSE OR AMS-5737 ASSN STD 5TH MATERIAL RESPONSE CAP
•
NUT COUNTERBORE DEPTH: 0.177 INCHES MINIMUM AND 0.197 INCHES MAXIMUM NUT IN
•
THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS
PLATE THICKNESS0.050 INCHES MINIMUM AND 0.070 INCHES MAXIMUM IN
NUT LENGTH1.235 INCHES MINIMUM AND 1.255 INCHES MAXIMUM IN
THREAD SERIESUNIFIED NATIONAL JOINT FINE (UNJF)
PLATE WIDTH0.797 INCHES MINIMUM AND 0.817 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONAMS-5525 ASSN STD 1ST MATERIAL RESPONSE OR AMS-5726 ASSN STD 2ND MATERIAL RESPONSE OR AMS-5731 ASSN STD 3RD MATERIAL RESPONSE OR AMS-5732 ASSN STD 4TH MATERIAL RESPONSE OR AMS-5737 ASSN STD 5TH MATERIAL RESPONSE CAP
MATERIAL DOCUMENT AND CLASSIFICATIONAMS-5596 ASSN STD 1ST MATERIAL RESPONSE OR AMS-5597 ASSN STD 2ND MATERIAL RESPONSE OR AMS-5662 ASSN STD 3RD MATERIAL RESPONSE OR AMS-5663 ASSN STD 4TH MATERIAL RESPONSE OR AMS-5664 ASSN STD 5TH MATERIAL RESPONSE NUT
NUT COUNTERBORE DEPTH0.177 INCHES MINIMUM AND 0.197 INCHES MAXIMUM NUT IN
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.250 INCHES IN
LOCKING FEATUREPREVAILING TORQUE ALL METAL DESIGN
SUBSTITUTES & CROSS-REFERENCES 1
C20814Reference document
Same NSN cross-reference
Reference document — Drawing number reference only
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is C20814-4-3?
C20814-4-3 is a NUT,SELF-LOCKING,PLATE.
What parts can replace C20814-4-3?
There is 1 known substitute for C20814-4-3: C20814. Substitute compatibility should be verified for your specific system.
What is the NSN for C20814-4-3?
C20814-4-3 is cataloged in the U.S. Government catalog under NSN 5310-01-485-6740. 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.