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PartsTable / COMPONENT / MS51987-435
MS51987-435 ✓ 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 PIN,SPRING is a the manufacturer industrial component. Key specifications include diameter: 0.250 INCHES NOMINAL IN, material: STEEL COMP 302 OVERALL, overall_length: 0.615 INCHES MINIMUM AND 0.635 INCHES MAXIMUM IN, style_designator: COILED, expanded_diameter: 0.260 INCHES MINIMUM AND 0.273 INCHES MAXIMUM IN, 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 5315-00-043-1270, 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
MS51987-435
NSN: 5315-00-043-1270
FSC: 5315
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
diameter0.250 INCHES NOMINAL IN
materialSTEEL COMP 302 OVERALL
overall_length0.615 INCHES MINIMUM AND 0.635 INCHES MAXIMUM IN
style_designatorCOILED
expanded_diameter0.260 INCHES MINIMUM AND 0.273 INCHES MAXIMUM IN
surface_treatmentPASSIVATE OVERALL
material_document_and_classification66 FED STD SINGLE MATERIAL RESPONSE OVERALL
surface_treatment_document_and_classificationQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN5315-00-043-1270
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: MS51987-435 · 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: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
DIAMETER: 0.250 INCHES NOMINAL IN
•
MATERIAL: STEEL COMP 302 OVERALL
•
STYLE DESIGNATOR: COILED
•
MATERIAL DOCUMENT AND CLASSIFICATION: 66 FED STD SINGLE MATERIAL RESPONSE OVERALL
•
SURFACE TREATMENT: PASSIVATE OVERALL
•
EXPANDED DIAMETER: 0.260 INCHES MINIMUM AND 0.273 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
DIAMETER0.250 INCHES NOMINAL IN
OVERALL LENGTH0.615 INCHES MINIMUM AND 0.635 INCHES MAXIMUM IN
MATERIALSTEEL COMP 302 OVERALL
STYLE DESIGNATORCOILED
MATERIAL DOCUMENT AND CLASSIFICATION66 FED STD SINGLE MATERIAL RESPONSE OVERALL
SURFACE TREATMENTPASSIVATE OVERALL
EXPANDED DIAMETER0.260 INCHES MINIMUM AND 0.273 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 2
NASM51987Interchangeable
Same NIIN cross-reference
interchangeable
MS51987-223Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS51987-435?
MS51987-435 is a PIN,SPRING.
What parts can replace MS51987-435?
There are 2 known substitutes for MS51987-435: NASM51987, MS51987-223. Substitute compatibility should be verified for your specific system.
What is the NSN for MS51987-435?
MS51987-435 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-00-043-1270. 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