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C20813-5-3 — NUT,SELF-LOCKING,PLATE

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

C20813-5-3: NUT,SELF-LOCKING,PLATE.

The NUT,SELF-LOCKING,PLATE is a the manufacturer industrial component. Key specifications include material: IRON ALLOY 660 CAP, nut_style: PLATE, nut_height: 0.642 INCHES MINIMUM AND 0.662 INCHES MAXIMUM IN, nut_length: 1.200 INCHES MINIMUM AND 1.220 INCHES MAXIMUM IN, plate_width: 0.980 INCHES MINIMUM AND 1.000 INCHES MAXIMUM IN, thread_class: 3B. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-485-7009, 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
C20813-5-3
NSN: 5310-01-485-7009
FSC: 5310 — Nuts and Washers
CAGE: 81755 — LOCKHEED MARTIN CORPORATION DIV LOCKHEED MARTIN AERONAUTICS COMPANY (USA)
SPECIFICATIONS
materialIRON ALLOY 660 CAP
nut_stylePLATE
nut_height0.642 INCHES MINIMUM AND 0.662 INCHES MAXIMUM IN
nut_length1.200 INCHES MINIMUM AND 1.220 INCHES MAXIMUM IN
plate_width0.980 INCHES MINIMUM AND 1.000 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 .950 POM .010, CAP O.D. .625 POM .010, BASE PLATE TOP LT CORNER TO RT SIDE LOWER CORNER 1.24 POM .010
thread_directionRIGHT-HAND
surface_treatmentPASSIVATE NUT
NSN5310-01-485-7009
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: C20813-5-3 · 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: 1.200 INCHES MINIMUM AND 1.220 INCHES MAXIMUM IN
•
THREAD SERIES: UNIFIED NATIONAL JOINT FINE (UNJF)
•
PLATE WIDTH: 0.980 INCHES MINIMUM AND 1.000 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS-5525 ASSN STD 1ST MATERIAL RESPONSE OR AMS-5726 ASSN STD 2ND MATERIAL RESPONSE OR AMS-3731 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 LENGTH1.200 INCHES MINIMUM AND 1.220 INCHES MAXIMUM IN
THREAD SERIESUNIFIED NATIONAL JOINT FINE (UNJF)
PLATE WIDTH0.980 INCHES MINIMUM AND 1.000 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONAMS-5525 ASSN STD 1ST MATERIAL RESPONSE OR AMS-5726 ASSN STD 2ND MATERIAL RESPONSE OR AMS-3731 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 SIZE0.312 INCHES IN
LOCKING FEATUREPREVAILING TORQUE ALL METAL DESIGN
SUBSTITUTES & CROSS-REFERENCES 3
C20813Reference document
Same NSN cross-reference
Reference document — Drawing number reference only
5310PL0784708Reference document
Same NSN cross-reference
Reference document — Informative reference only
5310PL1631630Reference document
Same NSN cross-reference
Reference document — Informative reference only
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is C20813-5-3?
C20813-5-3 is a NUT,SELF-LOCKING,PLATE.
What parts can replace C20813-5-3?
There are 3 known substitutes for C20813-5-3: C20813, 5310PL0784708, 5310PL1631630. Substitute compatibility should be verified for your specific system.
What is the NSN for C20813-5-3?
C20813-5-3 is cataloged in the U.S. Government catalog under NSN 5310-01-485-7009. 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.