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Technical Data Sheet
PartsTable / COMPONENT / NAS561C8-40
NAS561C8-40 ✓ 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: 0.258 INCHES MINIMUM AND 0.258 INCHES MINIMUM AND 0.264 INCHES MAXIMUM0.264 INCHES MAXIMUM IN, material: STEEL COMP 410 OR STEEL COMP 420 OVERALL, overall_length: 2.475 INCHES MINIMUM AND 2.475 INCHES MINIMUM AND 2.525 INCHES MAXIMUM2.525 INCHES MAXIMUM IN, shear_strength: 7700 DOUBLE POUND7700 DOUBLE POUND, hardness_rating: 43.0 ROCKWELL C MINIMUM AND 52.0 ROCKWELL C MAXIMUM OVERALL, style_designator: SLOTTEDSLOTTED. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-00-058-9816, 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
NAS561C8-40
NSN: 5315-00-058-9816
FSC: 5315
CAGE: D9182 — ZF INDUSTRIEANTRIEBE WITTEN GMBH (DEU)
SPECIFICATIONS
diameter0.258 INCHES MINIMUM AND 0.258 INCHES MINIMUM AND 0.264 INCHES MAXIMUM0.264 INCHES MAXIMUM IN
materialSTEEL COMP 410 OR STEEL COMP 420 OVERALL
overall_length2.475 INCHES MINIMUM AND 2.475 INCHES MINIMUM AND 2.525 INCHES MAXIMUM2.525 INCHES MAXIMUM IN
shear_strength7700 DOUBLE POUND7700 DOUBLE POUND
hardness_rating43.0 ROCKWELL C MINIMUM AND 52.0 ROCKWELL C MAXIMUM OVERALL
style_designatorSLOTTEDSLOTTED
surface_treatmentPASSIVATE OVERALL
material_thickness0.048 INCHES NOMINAL0.048 INCHES NOMINAL IN
specification/standard_data80205-NAS561 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD80205-NAS561 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
material_document_and_classification66 FED STD ALL MATERIAL RESPONSES OVERALL
surface_treatment_document_and_classificationQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN5315-00-058-9816
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: NAS561C8-40 · 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
•
MATERIAL: STEEL COMP 410 OR STEEL COMP 420 OVERALL
•
DIAMETER: 0.258 INCHES MINIMUM AND 0.264 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.048 INCHES NOMINAL IN
•
STYLE DESIGNATOR: SLOTTED
•
HARDNESS RATING: 43.0 ROCKWELL C MINIMUM AND 52.0 ROCKWELL C MAXIMUM OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: 66 FED STD ALL MATERIAL RESPONSES OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
MATERIALSTEEL COMP 410 OR STEEL COMP 420 OVERALL
OVERALL LENGTH2.475 INCHES MINIMUM AND 2.525 INCHES MAXIMUM IN
DIAMETER0.258 INCHES MINIMUM AND 0.264 INCHES MAXIMUM IN
MATERIAL THICKNESS0.048 INCHES NOMINAL IN
STYLE DESIGNATORSLOTTED
HARDNESS RATING43.0 ROCKWELL C MINIMUM AND 52.0 ROCKWELL C MAXIMUM OVERALL
MATERIAL DOCUMENT AND CLASSIFICATION66 FED STD ALL MATERIAL RESPONSES OVERALL
SURFACE TREATMENTPASSIVATE OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 14
9615DCInterchangeable
interchangeable cross-reference
interchangeable
7904825-00Interchangeable
interchangeable cross-reference
interchangeable
BJ2216745Interchangeable
interchangeable cross-reference
interchangeable
53-048-250-2500Interchangeable
interchangeable cross-reference
interchangeable
MS9047-242Interchangeable
interchangeable cross-reference
interchangeable
MS16562-163Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is NAS561C8-40?
NAS561C8-40 is a PIN,SPRING.
What parts can replace NAS561C8-40?
There are 14 known substitutes for NAS561C8-40: 9615DC, 7904825-00, BJ2216745 and 11 more. Substitute compatibility should be verified for your specific system.
Is NAS561C8-40 still available?
NAS561C8-40 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