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Technical Data Sheet
PartsTable / COMPONENT / NAS561C4-18
NAS561C4-18 ✓ 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: 0.125 INCHES NOMINAL IN, material: STEEL COMP 420 OVERALL, overall_length: 1.105 INCHES MINIMUM AND 1.145 INCHES MAXIMUM IN, hardness_rating: 46.0 ROCKWELL C MINIMUM AND 52.0 ROCKWELL C MAXIMUM OVERALL, style_designator: SLOTTED, surface_treatment: PASSIVATE OVERALL. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-00-559-7467, 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
NAS561C4-18
NSN: 5315-00-559-7467
FSC: 5315
CAGE: 80205 — NATIONAL AEROSPACE STANDARDS COMMITTEE AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA INC NOT FOR RFQ OR SOLICITATION USE (USA)
SPECIFICATIONS
diameter0.125 INCHES NOMINAL IN
materialSTEEL COMP 420 OVERALL
overall_length1.105 INCHES MINIMUM AND 1.145 INCHES MAXIMUM IN
hardness_rating46.0 ROCKWELL C MINIMUM AND 52.0 ROCKWELL C MAXIMUM OVERALL
style_designatorSLOTTED
surface_treatmentPASSIVATE OVERALL
material_thickness0.028 INCHES NOMINAL IN
material_document_and_classificationAISI ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NSN5315-00-559-7467
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: NAS561C4-18 · 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: 0.028 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: AISI ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
DIAMETER: 0.125 INCHES NOMINAL IN
•
SURFACE TREATMENT: PASSIVATE OVERALL
•
STYLE DESIGNATOR: SLOTTED
•
HARDNESS RATING: 46.0 ROCKWELL C MINIMUM AND 52.0 ROCKWELL C MAXIMUM OVERALL
•
MATERIAL: STEEL COMP 420 OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
OVERALL LENGTH1.105 INCHES MINIMUM AND 1.145 INCHES MAXIMUM IN
MATERIAL THICKNESS0.028 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONAISI ASSN STD SINGLE MATERIAL RESPONSE OVERALL
DIAMETER0.125 INCHES NOMINAL IN
SURFACE TREATMENTPASSIVATE OVERALL
STYLE DESIGNATORSLOTTED
HARDNESS RATING46.0 ROCKWELL C MINIMUM AND 52.0 ROCKWELL C MAXIMUM OVERALL
MATERIALSTEEL COMP 420 OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 20
MIL-P-10971Interchangeable
interchangeable cross-reference
interchangeable
79-048-250-1875Interchangeable
interchangeable cross-reference
interchangeable
NAS561C8-30Interchangeable
interchangeable cross-reference
interchangeable
79-014-078-0187Interchangeable
interchangeable cross-reference
interchangeable
MILP10971TYPE1C0MP0SITI0NBInterchangeable
interchangeable cross-reference
interchangeable
BA98203-19Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is NAS561C4-18?
NAS561C4-18 is a PIN,SPRING.
What parts can replace NAS561C4-18?
There are 20 known substitutes for NAS561C4-18: MIL-P-10971, 79-048-250-1875, NAS561C8-30 and 17 more. Substitute compatibility should be verified for your specific system.
Is NAS561C4-18 still available?
NAS561C4-18 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