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12387381-34 — WASHER,LOCK

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

12387381-34: WASHER,LOCK.

The WASHER,LOCK is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, hole_diameter: 0.320 INCHES MINIMUM AND 0.332 INCHES MAXIMUM IN, hardness_rating: 40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM, outside_diameter: 0.588 INCHES MINIMUM AND 0.610 INCHES MAXIMUM IN, special_features: WASHER SHALL BE IN ACCORDANCE WITH REQUIREMENTS OF MS35335, CARBON STEEL, EXCEPT FOR PROTECTIVE FINISH SPECIFIED HEREON, style_designator: FLAT EXTERNAL TEETH. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-540-1559, 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
12387381-34
NSN: 5310-01-540-1559
FSC: 5310 — Nuts and Washers
CAGE: 19207 — U S ARMY TANK AUTOMOTIVE COMMAND AMSTA-IM-MM (USA)
SPECIFICATIONS
materialSTEEL OVERALL
hole_diameter0.320 INCHES MINIMUM AND 0.332 INCHES MAXIMUM IN
hardness_rating40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM
outside_diameter0.588 INCHES MINIMUM AND 0.610 INCHES MAXIMUM IN
special_featuresWASHER SHALL BE IN ACCORDANCE WITH REQUIREMENTS OF MS35335, CARBON STEEL, EXCEPT FOR PROTECTIVE FINISH SPECIFIED HEREON
style_designatorFLAT EXTERNAL TEETH
surface_treatmentCHROMATE ZINC OVERALL
material_thickness0.028 INCHES MINIMUM AND 0.034 INCHES MAXIMUM IN
end_item_identification5420-00-889-2020
surface_treatment_document_and_classificationMIL-STD-171E MIL SPEC SINGLE TREATMENT RESPONSE BODY
NSN5310-01-540-1559
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 12387381-34 · 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
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-STD-171E MIL SPEC SINGLE TREATMENT RESPONSE BODY
•
HARDNESS RATING: 40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM
•
STYLE DESIGNATOR: FLAT EXTERNAL TEETH
•
OUTSIDE DIAMETER: 0.588 INCHES MINIMUM AND 0.610 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.028 INCHES MINIMUM AND 0.034 INCHES MAXIMUM IN
•
SURFACE TREATMENT: CHROMATE ZINC OVERALL
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-STD-171E MIL SPEC SINGLE TREATMENT RESPONSE BODY
HARDNESS RATING40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM
STYLE DESIGNATORFLAT EXTERNAL TEETH
OUTSIDE DIAMETER0.588 INCHES MINIMUM AND 0.610 INCHES MAXIMUM IN
MATERIAL THICKNESS0.028 INCHES MINIMUM AND 0.034 INCHES MAXIMUM IN
SPECIAL FEATURESWASHER SHALL BE IN ACCORDANCE WITH REQUIREMENTS OF MS35335, CARBON STEEL, EXCEPT FOR PROTECTIVE FINISH SPECIFIED HEREON
SURFACE TREATMENTCHROMATE ZINC OVERALL
END ITEM IDENTIFICATION5420-00-889-2020
MATERIALSTEEL OVERALL
HOLE DIAMETER0.320 INCHES MINIMUM AND 0.332 INCHES MAXIMUM IN
OTHER ITEMS IN FSC 5310 — Nuts and Washers
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5310-00-000-0040 5310-00-000-0077 5310-00-000-0079 5310-00-000-1146 5310-00-000-3815 5310-00-000-4532 5310-00-000-4540
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 12387381-34?
12387381-34 is a WASHER,LOCK.
What is the NSN for 12387381-34?
12387381-34 is cataloged in the U.S. Government catalog under NSN 5310-01-540-1559. 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.