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PartsTable / COMPONENT / 38-0021
38-0021 ✓ 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

NUT,SELF-LOCKING,EXTENDED WASHER. Key specifications include material: STEEL OVERALL, nut_style: HEXAGON, temp_rating: 450.0 FAHRENHEIT NOMINAL DEGF, thread_class: 3B, thread_series: UNJC, overall_height: 0.103 INCHES MINIMUM AND 0.125 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-811-6419, 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
38-0021
NSN: 5310-00-811-6419
FSC: 5310
CAGE: 39741 — MERILLAT ROAD SUPPLY CO (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleHEXAGON
temp_rating450.0 FAHRENHEIT NOMINAL DEGF
thread_class3B
thread_seriesUNJC
overall_height0.103 INCHES MINIMUM AND 0.125 INCHES MAXIMUM IN
hardness_rating49.0 ROCKWELL C MAXIMUM
locking_featurePREVAILING TORQUE ALL METAL DESIGN
thread_directionRIGHT-HAND
washer_thickness0.010 INCHES MINIMUM IN
surface_treatmentCADMIUM OVERALL
width_across_flats0.150 INCHES MINIMUM AND 0.158 INCHES MAXIMUM IN
NSN5310-00-811-6419
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 38-0021 · 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
•
WASHER THICKNESS: 0.010 INCHES MINIMUM IN
•
NUT STYLE: HEXAGON
•
WASHER OUTSIDE DIAMETER: 0.206 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
SURFACE TREATMENT: CADMIUM OVERALL
•
NOMINAL THREAD SIZE: 0.112 INCHES IN
•
WIDTH ACROSS FLATS: 0.150 INCHES MINIMUM AND 0.158 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
WASHER THICKNESS0.010 INCHES MINIMUM IN
NUT STYLEHEXAGON
WASHER OUTSIDE DIAMETER0.206 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
OVERALL HEIGHT0.103 INCHES MINIMUM AND 0.125 INCHES MAXIMUM IN
SURFACE TREATMENTCADMIUM OVERALL
NOMINAL THREAD SIZE0.112 INCHES IN
WIDTH ACROSS FLATS0.150 INCHES MINIMUM AND 0.158 INCHES MAXIMUM IN
THREAD CLASS3B
THREAD QUANTITY PER INCH40
VERIFIED SUBSTITUTES & CROSS-REFERENCES 13
80552Interchangeable
interchangeable cross-reference
interchangeable
648195Interchangeable
interchangeable cross-reference
interchangeable
805524Interchangeable
interchangeable cross-reference
interchangeable
FSIIInterchangeable
interchangeable cross-reference
interchangeable
JEFFERSON DMInterchangeable
interchangeable cross-reference
interchangeable
MS21042-04Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 38-0021?
38-0021 is a NUT,SELF-LOCKING,EXTENDED WASHER.
What parts can replace 38-0021?
There are 13 known substitutes for 38-0021: 80552, 648195, 805524 and 10 more. Substitute compatibility should be verified for your specific system.
Is 38-0021 still available?
38-0021 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026