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Technical Data Sheet
PartsTable / COMPONENT / MS51415-9
MS51415-9 ✓ 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,LOCK is a the manufacturer industrial component. Key specifications include hole_diameter: 0.509 INCHES MINIMUM AND 0.523 INCHES MAXIMUM IN, heat_treatment: QUENCHED AND TEMPERED, hardness_rating: 45.0 ROCKWELL C MINIMUM AND 53.0 ROCKWELL C MAXIMUM, outside_diameter: 0.873 INCHES MAXIMUM IN, style_designator: SPLIT HELICAL-RIGHT HAND, surface_treatment: ZINC AND CHROMATE OR ZINC OVERALL. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-216-7390, 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
MS51415-9
NSN: 5310-01-216-7390
FSC: 5310
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
hole_diameter0.509 INCHES MINIMUM AND 0.523 INCHES MAXIMUM IN
heat_treatmentQUENCHED AND TEMPERED
hardness_rating45.0 ROCKWELL C MINIMUM AND 53.0 ROCKWELL C MAXIMUM
outside_diameter0.873 INCHES MAXIMUM IN
style_designatorSPLIT HELICAL-RIGHT HAND
surface_treatmentZINC AND CHROMATE OR ZINC OVERALL
material_thickness0.125 INCHES MINIMUM IN
end_item_identificationMRAP - COUGAR CAT1 A2
nondefinitive_spec/std_dataA CLASS AND 2 STYLE
material_document_and_classification66 FED STD ALL MATERIAL RESPONSES OVERALL
surface_treatment_document_and_classificationASTM B633,TY 2,CL 3 ASSN STD 1ST TREATMENT RESPONSE OR ASTM A153 ASSN STD 2ND TREATMENT RESPONSE OVERALL
NSN5310-01-216-7390
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: MS51415-9 · 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 THICKNESS: 0.125 INCHES MINIMUM IN
•
HEAT TREATMENT: QUENCHED AND TEMPERED
•
HARDNESS RATING: 45.0 ROCKWELL C MINIMUM AND 53.0 ROCKWELL C MAXIMUM
•
SURFACE TREATMENT: ZINC AND CHROMATE OR ZINC OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: 66 FED STD ALL MATERIAL RESPONSES OVERALL
•
STYLE DESIGNATOR: SPLIT HELICAL-RIGHT HAND
•
MATERIAL: STEEL COMP 1060 OR STEEL COMP 1064 OR STEEL COMP 1065 OR STEEL COMP 1566 OR STEEL COMP 1069 OR STEEL COMP 1070 OR STEEL COMP 1074 OR STEEL COMP 1075 OR STEEL COMP 1078 OR STEEL COMP 1080 OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
MATERIAL THICKNESS0.125 INCHES MINIMUM IN
HEAT TREATMENTQUENCHED AND TEMPERED
END ITEM IDENTIFICATIONMRAP - COUGAR CAT1 A2
HARDNESS RATING45.0 ROCKWELL C MINIMUM AND 53.0 ROCKWELL C MAXIMUM
SURFACE TREATMENTZINC AND CHROMATE OR ZINC OVERALL
MATERIAL DOCUMENT AND CLASSIFICATION66 FED STD ALL MATERIAL RESPONSES OVERALL
STYLE DESIGNATORSPLIT HELICAL-RIGHT HAND
MATERIALSTEEL COMP 1060 OR STEEL COMP 1064 OR STEEL COMP 1065 OR STEEL COMP 1566 OR STEEL COMP 1069 OR STEEL COMP 1070 OR STEEL COMP 1074 OR STEEL COMP 1075 OR STEEL COMP 1078 OR STEEL COMP 1080 OVERALL
NONDEFINITIVE SPEC/STD DATAA CLASS AND 2 STYLE
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONASTM B633,TY 2,CL 3 ASSN STD 1ST TREATMENT RESPONSE OR ASTM A153 ASSN STD 2ND TREATMENT RESPONSE OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
101-0450Interchangeable
interchangeable cross-reference
interchangeable
101-389Interchangeable
interchangeable cross-reference
interchangeable
A8976Interchangeable
interchangeable cross-reference
interchangeable
30-00854Interchangeable
interchangeable cross-reference
interchangeable
2643-1Interchangeable
interchangeable cross-reference
interchangeable
17677Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS51415-9?
MS51415-9 is a WASHER,LOCK.
What parts can replace MS51415-9?
There are 8 known substitutes for MS51415-9: 101-0450, 101-389, A8976 and 5 more. Substitute compatibility should be verified for your specific system.
Is MS51415-9 still available?
MS51415-9 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