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Technical Data Sheet
PartsTable / COMPONENT / 120820-2
120820-2 ✓ Verified by PartsTable
— · NUT WASHER
WHAT YOU NEED TO KNOW
Match nut grade to bolt grade for full strength Lock nuts prevent loosening under vibration
Don't mix grades — weakens the joint
PRODUCT OVERVIEW

The WASHER,SPRING TENSION is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING OVERALL, hole_diameter: 0.255 INCHES MINIMUM AND 0.285 INCHES MAXIMUM IN, overall_height: 0.038 INCHES NOMINAL IN, outside_diameter: 0.470 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN, style_designator: SPRING TENSION, surface_treatment: PASSIVATE OVERALL. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-271-9603, 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
120820-2
NSN: 5310-01-271-9603
FSC: 5310
CAGE: 94271 — LOCKHEED MARTIN CORP (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
hole_diameter0.255 INCHES MINIMUM AND 0.285 INCHES MAXIMUM IN
overall_height0.038 INCHES NOMINAL IN
outside_diameter0.470 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN
style_designatorSPRING TENSION
surface_treatmentPASSIVATE OVERALL
material_thickness0.025 INCHES NOMINAL IN
special_test_featuresSPECIAL QUALITY CONTROL TESTING
criticality_code_justificationZZZY
reference_number_differentiating_characteristicsAS DIFFERENTIATED BY MATERIAL WHICH MUST CONFORM TO SHIPS PARTS CONTROL CENTER SPECIAL QUALITY CONTROL PROVISIONS
NSN5310-01-271-9603
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 120820-2 · 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
•
CRITICALITY CODE JUSTIFICATION: ZZZY
•
MATERIAL THICKNESS: 0.025 INCHES NOMINAL IN
•
TEST DATA DOCUMENT: 81349-MIL-P-23199 SPECIFICATION (INCLUDES ENGINEERING TYPE BULLETINS, BROCHURES,ETC., THAT REFLECT SPECIFICATION TYPE DATA IN SPECIFICATION FORMAT; EXCLUDES COMMERCIAL CATALOGS, INDUSTRY DIRECTORIES, AND SIMILAR TRADE PUBLICATIONS, REFLECTING GENERAL TYPE DATA ON CERTAIN ENVIRONMENTAL AND PERFORMANCE REQUIREMENTS AND TEST CONDITIONS THAT ARE SHOWN AS "TYPICAL", "AVERAGE", "NOMINAL", ETC.).
•
MATERIAL: STEEL CORROSION RESISTING OVERALL
•
SPECIAL TEST FEATURES: SPECIAL QUALITY CONTROL TESTING
•
SURFACE TREATMENT: PASSIVATE OVERALL
•
HOLE DIAMETER: 0.255 INCHES MINIMUM AND 0.285 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
CRITICALITY CODE JUSTIFICATIONZZZY
MATERIAL THICKNESS0.025 INCHES NOMINAL IN
TEST DATA DOCUMENT81349-MIL-P-23199 SPECIFICATION (INCLUDES ENGINEERING TYPE BULLETINS, BROCHURES,ETC., THAT REFLECT SPECIFICATION TYPE DATA IN SPECIFICATION FORMAT; EXCLUDES COMMERCIAL CATALOGS, INDUSTRY DIRECTORIES, AND SIMILAR TRADE PUBLICATIONS, REFLECTING GENERAL TYPE DATA ON CERTAIN ENVIRONMENTAL AND PERFORMANCE REQUIREMENTS AND TEST CONDITIONS THAT ARE SHOWN AS "TYPICAL", "AVERAGE", "NOMINAL", ETC.).
MATERIALSTEEL CORROSION RESISTING OVERALL
SPECIAL TEST FEATURESSPECIAL QUALITY CONTROL TESTING
SURFACE TREATMENTPASSIVATE OVERALL
OVERALL HEIGHT0.038 INCHES NOMINAL IN
HOLE DIAMETER0.255 INCHES MINIMUM AND 0.285 INCHES MAXIMUM IN
STYLE DESIGNATORSPRING TENSION
REFERENCE NUMBER DIFFERENTIATING CHARACTERISTICSAS DIFFERENTIATED BY MATERIAL WHICH MUST CONFORM TO SHIPS PARTS CONTROL CENTER SPECIAL QUALITY CONTROL PROVISIONS
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
11501111-3Interchangeable
interchangeable cross-reference
interchangeable
11504341-3Interchangeable
interchangeable cross-reference
interchangeable
A211-5Interchangeable
interchangeable cross-reference
interchangeable
H10099LLHX55054Interchangeable
Same NIIN cross-reference
interchangeable
B0500-025-SInterchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 120820-2?
120820-2 is a WASHER,SPRING TENSION.
What parts can replace 120820-2?
There are 5 known substitutes for 120820-2: 11501111-3, 11504341-3, A211-5 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 120820-2?
120820-2 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-271-9603. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026