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Technical Data Sheet
PartsTable / COMPONENT / 12387327-1
12387327-1 ✓ 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,FLAT is a the manufacturer industrial component. Key specifications include material: STEEL COMP 1050 OR STEEL COMP 4130 OR STEEL COMP 4140 OR STEEL COMP 8640 OR STEEL COMP 8740 OVERALL, thickness: 0.089 INCHES NOMINAL IN, hole_diameter: 0.281 INCHES NOMINAL IN, hardness_rating: 33.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM, overall_diameter: 0.500 INCHES NOMINAL IN, surface_treatment: ZINC AND CHROMATE 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 5310-01-379-0804, 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
12387327-1
NSN: 5310-01-379-0804
FSC: 5310
CAGE: 19207 — U S ARMY TANK AUTOMOTIVE COMMAND AMSTA-IM-MM (USA)
SPECIFICATIONS
materialSTEEL COMP 1050 OR STEEL COMP 4130 OR STEEL COMP 4140 OR STEEL COMP 8640 OR STEEL COMP 8740 OVERALL
thickness0.089 INCHES NOMINAL IN
hole_diameter0.281 INCHES NOMINAL IN
hardness_rating33.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM
overall_diameter0.500 INCHES NOMINAL IN
surface_treatmentZINC AND CHROMATE OVERALL
peripheral_shape_styleROUND
center_hole_shape_styleROUND
end_item_identificationMRAP-RG-33 ARMORED UTILITY VEHICLE (AUV); MULTIPLE LAUNCH ROCKET SYSTEM (MLRS); A4 BRADLEY FIGHTING VEHICLE; A3 BRADLEY FIGHTING VEHICLE
cross-sectional_shape_styleRECTANGULAR
surface_treatment_document_and_classificationASTM B633,TYPE 2,CLASS 2 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
NSN5310-01-379-0804
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 12387327-1 · 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
•
MATERIAL: STEEL COMP 1050 OR STEEL COMP 4130 OR STEEL COMP 4140 OR STEEL COMP 8640 OR STEEL COMP 8740 OVERALL
•
HARDNESS RATING: 33.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM
•
SURFACE TREATMENT: ZINC AND CHROMATE OVERALL
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: ASTM B633,TYPE 2,CLASS 2 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
•
THICKNESS: 0.089 INCHES NOMINAL IN
•
HOLE DIAMETER: 0.281 INCHES NOMINAL IN
•
PERIPHERAL SHAPE STYLE: ROUND
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALSTEEL COMP 1050 OR STEEL COMP 4130 OR STEEL COMP 4140 OR STEEL COMP 8640 OR STEEL COMP 8740 OVERALL
END ITEM IDENTIFICATIONMRAP-RG-33 ARMORED UTILITY VEHICLE (AUV); MULTIPLE LAUNCH ROCKET SYSTEM (MLRS); A4 BRADLEY FIGHTING VEHICLE; A3 BRADLEY FIGHTING VEHICLE
HARDNESS RATING33.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM
SURFACE TREATMENTZINC AND CHROMATE OVERALL
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONASTM B633,TYPE 2,CLASS 2 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
THICKNESS0.089 INCHES NOMINAL IN
HOLE DIAMETER0.281 INCHES NOMINAL IN
PERIPHERAL SHAPE STYLEROUND
OVERALL DIAMETER0.500 INCHES NOMINAL IN
CENTER HOLE SHAPE STYLEROUND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
10390325Interchangeable
interchangeable cross-reference
interchangeable
10910174-19Interchangeable
interchangeable cross-reference
interchangeable
12387327Interchangeable
interchangeable cross-reference
interchangeable
12569613-48Interchangeable
interchangeable cross-reference
interchangeable
10910174-48Interchangeable
interchangeable cross-reference
interchangeable
12569613Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 12387327-1?
12387327-1 is a WASHER,FLAT.
What parts can replace 12387327-1?
There are 15 known substitutes for 12387327-1: 10390325, 10910174-19, 12387327 and 12 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 12387327-1?
12387327-1 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-379-0804. 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